Health & Fitness Calculators

Calculate your Body Mass Index from height and weight, see your WHO category, healthy weight range, BMI Prime and ponderal index, with CDC percentiles for children and teens.

Find your Basal Metabolic Rate — the calories your body burns at complete rest — with Mifflin-St Jeor, Harris-Benedict, Katch-McArdle and four other equations side by side, plus your daily calories at six activity levels.

Total Daily Energy Expenditure: how many calories you burn per day at your activity level, with goal calories for losing or gaining weight, macros, BMI and a choice of Mifflin-St Jeor, Harris-Benedict or Katch-McArdle.

Set a weight-loss target by weekly pace or deadline and see the daily calories, deficit, goal date, a week-by-week plan and macros — with intakes never set below safe minimums.

Split your daily calories into protein, carbs and fat grams for your goal: enter your calories or estimate them from your age, height, weight and activity, pick a preset diet or your own split, and see grams per meal, fiber and limits.

How many grams of protein you need per day for your weight and goal, from general health to building muscle, losing fat, endurance training, healthy aging, pregnancy and breastfeeding, with per-meal amounts and food equivalents.

Estimate your ideal body weight with the Robinson, Miller, Devine, Hamwi, Peterson and Lorentz formulas, see the healthy BMI weight range for your height, adjust for body frame size and compare with your current weight.

Estimate your body-fat percentage with the US Navy tape method, the BMI method or a 3- or 7-site skinfold test, and see your ACE category, fat and lean mass, the healthy range for your age and how much fat you would lose to reach a target.

A daily water target from your body weight, exercise minutes and intensity, climate, altitude, pregnancy or breastfeeding, in fluid ounces, cups, liters and bottles, with a drinking schedule for your day.

Your five training zones from age and resting heart rate, using the Karvonen method.

Solve for running pace, finish time or distance in miles or kilometers, with per-mile and per-km splits, negative-split planning and Riegel race-time predictions.

Convert a step count into calories burned from your weight, height and walking or running pace, with distance, time, calories per 1,000 steps, net calories and the steps needed for a calorie goal.

Find the best time to go to bed or wake up based on sleep cycles, with your own fall-asleep time and cycle length and the recommended hours of sleep for your age.

Estimate the calories you burn in a workout from the activity, your body weight and how long you go.

Divide your waist by your hip measurement to see your waist-to-hip ratio and its health-risk band.

Compare your waist to your height — the simple “keep your waist under half your height” health check.

Estimate your lean body mass, fat mass and lean percentage from weight and height with the Boer formula.

Calculate body surface area (BSA) in square meters from height and weight using the Mosteller formula.

Estimate your maximum heart rate from your age with the Fox (220 − age) and Tanaka formulas.

Find your target heart-rate training zone from age and resting heart rate with the Karvonen method.

Estimate body-fat percentage from tape measurements using the US Army/Navy circumference method.

Split your daily calories for a ketogenic diet — 5% carbs, protein from your target, the rest fat.

Roughly estimate blood alcohol content from drinks, body weight and time with the Widmark formula.

Convert between A1C percentage and estimated average glucose (eAG) in mg/dL and mmol/L.

Add up what smoking costs per day, month, year and decade, with rising pack prices, what the money could grow to invested, pack-years, and how much you have saved since quitting.

Work out your Fat-Free Mass Index from weight, height and body-fat percentage, with the height-normalized FFMI, fat and lean mass, a rating for men or women, the lean mass you would need for a goal FFMI and how sensitive the result is to your body-fat estimate.

Estimate your VO2 max from the Cooper 12-minute run test — enter the distance you cover and get your aerobic-fitness rating.

Convert a powerlifting total to a Wilks score so lifters of different bodyweights can be compared fairly.

Roughly estimate blood alcohol content from standard drinks, bodyweight, sex and time using the Widmark formula.

Pick a fasting protocol and your first meal time to see your exact eating window, fasting hours and when to eat next.

Estimate calories burned in a workout from the activity’s MET value, your bodyweight in kilograms and the duration.

Find your safe daily caffeine limit from bodyweight, capped at the FDA’s 400 mg, with rough coffee and energy-drink equivalents.

Enter your last donation date and type to see the next date you are eligible to give blood, and how long is left.

See how much caffeine is still in your system now, and how many hours until it drops below sleep-disrupting levels, from the dose, time and your half-life.

Estimate the calories burned rucking with a loaded pack, factoring in body weight, load, distance, time and elevation gain.

General reference for daily sodium, potassium and magnesium during an extended water fast — with a clear warning that prolonged fasting needs medical supervision.

Turn your daily calories and a target fat percentage into grams of fat per day, with a saturated-fat limit.

Convert daily calories and a carb percentage into grams of carbohydrate per day.

See your recommended daily limit for added sugar in grams and teaspoons, by AHA and WHO guidance.

Find your daily fiber target from your calorie intake, using the 14 g per 1,000 kcal rule.

Compare your daily sodium to the recommended limits and see the equivalent in table salt.

See the adequate potassium intake for your sex and compare it with your current intake.

Split your daily protein target across your meals to support muscle protein synthesis.

Work out net carbs from total carbohydrate, fiber and sugar alcohols for keto and low-carb tracking.

Set a goal weight and timeline and get the daily calorie target and deficit to reach it.

Divide your daily calories across meals and snacks with a per-meal breakdown table.

A daily water target that adds fluid for the minutes you exercise on top of your body-weight baseline.

Estimate the calories, grams of alcohol and standard drinks in a beer, wine or spirit.

Work out mean arterial pressure from a blood-pressure reading — or average a list of home readings — with pulse pressure, the blood-pressure category, heart-rate-corrected and alternative MAP formulas, kPa units and cerebral perfusion pressure.

Find your pulse pressure — the gap between systolic and diastolic blood pressure — and see how it compares to the normal range.

Enter a blood-pressure reading and see which ACC/AHA category it falls into, from normal through hypertensive crisis.

Estimate your kidney filtration rate (eGFR) with the race-free 2021 CKD-EPI creatinine equation and see the matching CKD stage.

Estimate creatinine clearance with the Cockcroft-Gault equation from age, weight, sex and serum creatinine — widely used for drug dosing.

Calculate BMI Prime — your BMI as a simple ratio to the upper healthy limit of 25 — from your weight and height.

Compute the Ponderal Index — mass divided by height cubed — a body-size measure that scales more fairly for very tall or short people than BMI.

Turn your cholesterol panel (mg/dL or mmol/L) into the ratios doctors watch — total-to-HDL, LDL-to-HDL and triglyceride-to-HDL — plus non-HDL cholesterol, the atherogenic index of plasma, an LDL estimate when LDL was not measured, and the category of every value.

From a current blood alcohol estimate, see roughly how long until you reach 0.00 and how long until you would fall under 0.08.

Convert any drink’s volume and alcohol percentage into US standard drinks and grams of pure alcohol.

Calculate a child or teen’s BMI and CDC BMI-for-age percentile (ages 2–19) from age or birth date, sex, height and weight, with the category, z-score, percent of the 95th percentile, extended percentiles for severe obesity and a healthy weight range for their height.

Estimate your Body Roundness Index from waist circumference and height — a shape-based measure of central body fat that BMI misses.

Divide your waist by your height to get the waist-to-height ratio (WHtR) and see which cardiometabolic risk band the "keep your waist under half your height" rule places you in.

Compare your waist and hip measurements to get the waist-to-hip ratio (WHR), your apple-or-pear body shape, and the WHO risk band for your sex.

Estimate your lean body mass in kilograms and as a percentage of body weight using the Boer formula, from your sex, weight and height.

Turn your weight, height and body-fat percentage into a fat-free mass index (FFMI) and a height-normalized FFMI to gauge how much muscle you carry for your frame.

Use your resting heart rate and age with the Karvonen heart-rate-reserve method to get personalized training zones that account for your fitness, not just your age.

Convert the distance you cover in a 12-minute Cooper run into an estimated VO2 max in mL/kg/min and see how your aerobic fitness rates.

Estimate your maximum heart rate from your age using four validated formulas — Fox, Tanaka, Gulati and Nes — and see how much they differ.

Estimate blood alcohol concentration (BAC) with the Widmark equation from standard drinks, beer, wine and spirits or grams of alcohol, body weight, sex and time — with an optional Watson body-water method, adjustable elimination rate, time until 0.00% and under a chosen limit, and an hour-by-hour BAC curve. An educational estimate only.

Enter the time you need to wake up and get the bedtimes that let you finish complete 90-minute sleep cycles, so you wake between cycles instead of mid-sleep.

Estimate how much water to drink each day from your body weight plus a top-up for exercise, shown in litres, millilitres and 8-ounce cups.

Compare your daily sodium against the WHO (2,000 mg), US FDA/Dietary Guidelines (2,300 mg), UK (6 g salt) and AHA ideal (1,500 mg) limits — enter sodium in mg, g or mmol, or salt in grams or teaspoons, or list foods from their labels — with the salt equivalent, % Daily Value, children’s limits by age and how much to cut.

Enter your goal finish time for a 5K, 10K, half or full marathon and get the exact pace per kilometre and per mile you need to hold, plus your average speed.

Estimate body surface area in m² from height and weight using the Mosteller, Du Bois and Haycock formulas — the basis of many drug and fluid dosing rules.

Estimate a healthy body-weight target from height, sex and frame size using the Hamwi method, with a small-, medium- and large-frame range.

Compute adjusted body weight (AjBW) from ideal and actual weight — the dosing weight used for many medications in overweight patients.

Estimate calories burned for any activity from its MET value, your weight and the time spent — the metabolic-equivalent method used in exercise science.

Estimate the calories you burn per day from BMR and an activity multiplier, with maintenance, cutting and bulking targets.

Turn a daily calorie target into grams of protein, carbs and fat for balanced, high-protein, low-carb or keto splits.

Find your daily protein target in grams from body weight and goal, from the sedentary RDA up to muscle-building and dieting levels.

Estimate your one-rep max from a set taken to near failure using the Epley and Brzycki formulas, with a full percentage-of-1RM training table.

Find personalised training heart-rate zones with the Karvonen heart-rate-reserve method, which factors in your resting pulse.

See the recommended total pregnancy weight-gain range for your pre-pregnancy BMI, plus a guide to how much to have gained by a given week.

Estimate your ovulation day and fertile window from your last period with the luteal-phase, calendar (shortest/longest cycle) or Standard Days method, see a day-by-day fertility table for the cycle, check any date, and know when to start ovulation tests.

Estimate your baby’s due date from your last menstrual period using Naegele’s rule, adjusted for cycle length, with trimester milestones.

Estimate glomerular filtration rate (eGFR) from serum creatinine, age and sex using the race-free 2021 CKD-EPI equation, with the matching CKD stage.

Adjust a total serum calcium reading for a low or high albumin level, so hypo- and hypercalcaemia are not masked by protein binding.

Compute the serum anion gap from sodium, chloride and bicarbonate, with an albumin-corrected value to screen for metabolic acidosis.

Work out mean arterial pressure from a systolic and diastolic blood-pressure reading, with pulse pressure and a perfusion-range check.

Correct a measured QT interval for heart rate with the Bazett, Fridericia, Framingham and Hodges formulas, and flag a prolonged QTc.

Measure lifetime cigarette exposure in pack-years from cigarettes per day and years smoked — the standard metric for lung-cancer screening.

Estimate body roundness index from waist circumference and height — a body-shape measure that tracks visceral fat better than BMI alone.

Convert an HbA1c percentage to estimated average glucose (eAG) in mg/dL and mmol/L using the ADAG study regression.

Estimate creatinine clearance with the Cockcroft-Gault equation using actual, ideal or adjusted body weight, creatinine in mg/dL or µmol/L, with BMI-based weight guidance and kidney function ranges.

Calculate 24-hour fluid resuscitation for a burn patient with the Parkland formula, split into the first-8-hour and next-16-hour rates.

Turn a weekly weight-loss goal into a daily calorie deficit and eating target from your maintenance calories, with a timeline to your goal.

Estimate basal metabolic rate from lean body mass with the Katch-McArdle equation, plus daily energy expenditure at your activity level.

Compare the calories you eat against the calories you burn to see your daily energy balance, weekly surplus or deficit, and the weight change it implies.

See the date you would reach your goal weight at a weekly pace, a % of body weight, a deadline or a daily deficit — with a week-by-week plan, a weight chart, safe-pace checks and your maintenance calories at goal.

Find the daily calories to maintain a goal weight and the reduced intake needed to reach it at a chosen weekly loss rate.

Convert your daily calorie target into grams of carbohydrate at a chosen percentage of calories, with the recommended 45–65% range for reference.

Turn your calorie target into grams of dietary fat at a chosen percentage, with the recommended 20–35% range and a saturated-fat cap for reference.

Estimate your daily dietary fibre target from your calorie intake using the 14 grams per 1,000 kcal guideline, with age and sex reference amounts.

See your recommended daily added-sugar limit from the American Heart Association and the WHO 10% and 5% of calories thresholds.

Estimate a safe daily caffeine limit from your body weight, with the 400 mg general adult cap and a lower pregnancy threshold, in milligrams and cups of coffee.

Calculate the calories in an alcoholic drink from its volume and ABV, including the pure-alcohol calories and a total across several drinks.

Estimate daily water needs from body weight plus extra fluid for exercise, so your intake scales with how active your day is.

Estimate the calories burned from your daily step count, scaled by body weight, and see the distance those steps cover.

Convert a daily calorie surplus or deficit over a number of days into the pounds or kilograms of weight change it implies.

Work out a child or teenager’s BMI and see why it must be read against age- and sex-specific CDC percentiles, not adult cut-offs.

Determine whether you have a small, medium or large body frame from your height-to-wrist ratio — the standard way to personalise ideal-weight ranges.

Estimate body-fat percentage from tape measurements using the U.S. Navy circumference formula — no calipers or scales required.

Convert three caliper skinfold measurements into body-fat percentage with the Jackson-Pollock 3-site equation and the Siri conversion.

Compare your waist measurement to the NIH/WHO sex-specific thresholds and see the cardiometabolic risk category — in both centimetres and inches.

Estimate your metabolic age by comparing your basal metabolic rate to a lean reference peer — a body-composition twist on your calendar age.

Turn grams of protein, carbs, fat, fibre and alcohol into total calories and see the percentage each macronutrient contributes.

Convert a weight between kilograms, pounds and stone and get your BMI and weight category in one step.

Classify a blood-pressure reading into the ACC/AHA 2017 categories — from normal to hypertensive crisis — with pulse pressure and mean arterial pressure.

Divide total cholesterol by HDL to get the ratio that predicts heart risk better than total cholesterol alone, with your non-HDL figure too.

Measure how many beats per minute your heart rate drops after exercise and check it against the fitness and prognostic reference thresholds.

Find the heart-rate zone where fat supplies the largest share of energy, using either %max heart rate or the Karvonen reserve method.

Split your daily protein target across your meals and check it against the ~0.4 g/kg per-meal ceiling for muscle protein synthesis.

Split your daily calorie budget across breakfast, lunch, dinner and snacks using your own percentages — automatically normalised to 100%.

Set a fat-loss (cutting) calorie target from your maintenance calories and a weekly rate of loss, with a safety floor built in.

Turn your maintenance calories into a lean-bulk or standard-bulk target from a chosen weekly rate of weight gain.

Estimate the calories that keep your weight stable from the Mifflin-St Jeor equation and your activity level.

Set ketogenic macros in grams — carbs capped, protein from body weight, and fat filling the rest of your calorie budget.

Pick a fasting protocol and a first-meal time to get your exact eating window and fasting window as clock times.

See how a daily gap between your calorie intake and maintenance turns into weekly and monthly weight change.

Estimate the calories you burn running from your pace, body weight and duration — faster pace covers more ground and burns more.

Estimate calories burned cycling from your body weight, ride time and intensity using standard MET values.

Estimate calories burned swimming from your body weight, time in the water and stroke or intensity, using standard MET values.

Your daily sodium-to-potassium ratio by mass and molar, compared with US (NASEM / Dietary Guidelines), WHO and American Heart Association targets: salt equivalent, mmol, percent of each limit or target, how much potassium to add or sodium to cut to reach a 1:1 molar ratio, and potassium-rich foods.

Turn a per-kilogram order (mg/kg/day or mg/kg/dose) into the amount per dose and per day, with optional maximum-dose caps, the liquid volume to measure, tablets per dose and the total for a course.

Calculate a child’s per-dose and daily medicine amount from a mg/kg order, with an adult per-dose ceiling so the child never exceeds the maximum.

Work out the drops-per-minute for a gravity IV from the volume, infusion time and the tubing’s drop factor, plus the equivalent mL/hour.

Find how long an IV will take to finish from the bag volume and the flow rate, with the completion time in hours and minutes.

Estimate your correction factor — how far one unit of insulin drops blood glucose — from your total daily insulin dose using the 1800/1500 rule.

Estimate your insulin-to-carb ratio — grams of carbohydrate covered by one unit of insulin — from your total daily dose using the 500/450 rule.

Classify an eGFR value into its KDIGO chronic-kidney-disease stage (G1–G5) and see what that category means for kidney function.

Find the body weight that matches a chosen BMI for your height, your healthy-weight range (standard or Asian cut-offs), how much you would need to lose or gain from your current weight, and how long that takes at a steady weekly pace.

See how far and how long you would need to walk to burn off a food, from its calories, your body weight and your walking pace.

Estimate the calories your body burns at rest each day with Mifflin-St Jeor, Harris-Benedict, Cunningham, Katch-McArdle, Owen and Schofield side by side, compare a lab-measured RMR, and see your daily burn at six activity levels.

Estimate a weight-based acetaminophen (paracetamol) dose and the maximum safe daily amount, with adult single-dose and daily ceilings applied.

Estimate the fluid deficit in litres from body weight and an estimated percentage of dehydration, using the standard clinical formula.

Estimate the calories you burn from the number of laps you swim, your stroke, your pace and your body weight — using standard MET values.

Convert a step count into distance walked in kilometres and miles, using a stride length estimated from your height.

Convert a treadmill speed and incline into the equivalent flat outdoor running pace, using the ACSM running metabolic equation.

Calculate your running economy — the oxygen and energy cost of running a kilometre — from your VO2 at a given pace.

Plan your race-day carbohydrate intake: total grams, gels and per-hour targets from your expected finish time.

Work out your hourly sweat rate from before-and-after body weight, and how much fluid to drink to replace it.

Find your daily protein target for building muscle, plus a per-meal split and the evidence-based 1.6–2.2 g/kg range.

Calculate a creatine loading protocol from your body weight — 0.3 g/kg a day, the classic 20 g a day, or no loading — with grams per dose, the maintenance dose, a dated day-by-day schedule, when your muscles should be saturated, scoops per dose, how long a tub lasts and the cost per day.

Set your daily fiber target from your calorie intake using the 14 g per 1,000 kcal guideline, and compare it to the age/sex reference.

Calculate the glycemic load of a food or meal from its glycemic index and carbohydrate content, and see whether it is low, medium or high.

Convert your typical drinks into UK alcohol units per week, grams of pure alcohol and US standard drinks, and compare with the 14-unit guideline.

Calculate your BMI Prime (BMI relative to the 25 upper limit), see your category, and find the weight that brings you to a healthy BMI.

Add up your weekly moderate and vigorous activity (vigorous counts double), plus everyday walking, and check it against the WHO/CDC 150–300-minute guideline, the 2-day muscle-strengthening goal, the older-adult balance goal or the children’s 60-minutes-a-day target — with the gap to close, MET-minutes and a chart.

Add up to four activities and turn your week into MET-minutes, moderate-equivalent minutes and calories, then compare them with the 500–1,000 MET-minute target and the WHO 150–300 minute guideline.

Estimate how much of your waking day is spent sitting and see where it falls on prolonged-sitting risk bands.

Estimate the extra calories you burn by standing instead of sitting at your desk each day, week and year.

Plan how long a flexibility routine takes from the number of stretches, hold time, sets and rest between them.

Estimate sweat lost in a sauna, steam room or infrared session from time, rounds and sweat rate, or measure it by weighing yourself before and after; see the share of body weight, dehydration level, sodium lost and how much water to drink (about 150% of the loss).

Turn a weekly cold-exposure target into a per-session time and see safety notes for the water temperature.

Work out how much sunscreen to apply for your coverage and how much a day outdoors needs with reapplication.

A rough educational estimate of how many minutes of midday sun it takes to make vitamin D for your skin type.

Add up the caffeine in your coffee, tea, energy drinks and soda and compare it to the 400 mg daily limit.

Count the eye-rest breaks a day of screen work needs under the 20-20-20 rule and the time they take.

Plan movement breaks across your workday from a sit interval and break length, and see total sitting vs moving time.

Turn pounds lost into a percentage of your starting body weight, and see how far you are toward a goal weight.

The calendar date you would reach a goal weight, losing or gaining, from a fixed weekly rate, a percentage of body weight per week, or a daily calorie deficit with metabolic slowdown, plus a week-by-week milestone table and weight chart.

See how a change in body weight moves your BMI, from starting BMI to new BMI and any category shift.

Plan how long it takes to reach a goal waist size at a steady rate, with the rough weight loss it implies.

Split a weekly calorie average into higher and lower days so the week still averages your target intake.

Plan a diet refeed day: raise calories toward maintenance and set a higher-carb macro target for the day.

Ramp calories back up after a diet by small weekly steps, with a week-by-week schedule to maintenance.

Estimate daily calorie needs from lean body mass using the Katch-McArdle formula and your activity level.

Find a lean-bulk weight-gain rate for your experience level and the daily calorie surplus it takes.

Estimate how many weeks a fat-loss cut takes from your weight to lose and daily calorie deficit.

Work out the daily step goal that creates the calorie burn needed to hit a target weekly weight loss.

See how many minutes of walking, jogging, cycling or swimming it takes to burn off a treat you enjoyed.

Estimate how tall a child will grow from the parents’ heights (mid-parental target height and range), and from the child’s current height on the CDC growth chart.

Estimate a baby’s weight percentile for age and sex against WHO growth references for the first two years.

Estimate how much formula a baby needs per day and per feeding from body weight, using the common 2.5 oz-per-pound rule.

Estimate how much expressed breast milk a baby needs per day and per feeding from body weight, using the 150 mL/kg guideline.

Compute a child’s BMI and see the CDC weight-status category from the BMI-for-age percentile off their growth chart.

Estimate a child’s daily calorie needs from birth to 18 with the 2023 National Academies (or 2005 IOM) energy equations, compare the USDA Dietary Guidelines table, and see food-group amounts, macro ranges, fiber and added-sugar limits.

Estimate a child’s daily fluid needs from body weight using the Holliday-Segar maintenance-fluid method.

See how much sleep a child needs by age from the AAP/AASM guidelines, and a suggested bedtime for a chosen wake-up time.

Enter a baby’s age in months to see the typical developmental milestones and how many baby teeth to expect around that age.

Estimate a generic weight-based pediatric dose in milligrams and millilitres from body weight, dose per kg and liquid concentration.

Turn two height measurements into an annualised growth velocity in cm per year — the key metric for tracking a child’s growth.

Estimate how tall a child will be as an adult from their current height, age and sex, using the percent-of-adult-height method and the CDC growth-chart percentile, with the current percentile, a rough range, a height-by-age path and an optional mid-parental check.

See exactly which plates to load on each side of the bar to reach a target barbell weight — for pounds or kilograms.

Build a barbell warm-up ramp from empty bar to your working weight — percentages, weights and reps for each set.

Turn your one-rep max into a full percentage table of training weights, with the reps each intensity typically allows.

Convert a target RPE and rep count into a working weight from your one-rep max — autoregulate your training load.

Calculate training volume load (sets × reps × weight) and total reps for an exercise — track workload week to week.

Project your next-week working weight from a weekly increase percentage, and see the ramp over a full training block.

Set your deload weights and reduced volume from your normal working numbers — recover without losing progress.

See how your lift compares to bodyweight-based strength standards — from untrained to elite — for the main barbell lifts.

Compare lifters of different sizes with a raw bodyweight ratio and an allometric (2/3-power) strength index.

Get an evidence-based rest interval between sets based on your training goal — strength, hypertrophy, power or endurance.

Set a 5/3/1-style training max from your true or estimated one-rep max, and get the first weeks working sets.

Turn one weight-for-reps set into a full 1RM through 12RM table, using the Epley or Brzycki estimation formula.

Estimate a daily water target from your body weight, with an add-on for exercise — in liters, ounces and cups.

Estimate the fluid, sodium and potassium you lose in sweat during exercise, from your sweat rate or a before-and-after weigh-in, and get a per-hour drinking and sodium plan, salt, sports drink and tablet equivalents, and how much to drink afterwards.

See how long caffeine lingers in your body: when your dose falls below a sleep-safe level and when it is essentially gone.

Find the best time to take a melatonin supplement before your target bedtime, based on how long it takes to work.

Work out when to switch off phones and screens before bed to protect your sleep, from your target bedtime.

Add up the calories from a night of drinks — beer, wine, spirits and cocktails — and see the exercise it would take to burn them.

Estimate how much water to drink around a night of alcohol to blunt dehydration, plus a simple electrolyte plan.

See how much money you save by quitting cigarettes over days, months and years — plus the well-known health recovery milestones.

Estimate your daily nicotine from vaping, a rough cigarette-content comparison, and what the e-liquid costs you.

Estimate the glycemic load of a meal from its carbs and GI, plus a rough peak blood-sugar rise for a typical adult.

Enter a fasting blood glucose reading to see its category — low, normal, prediabetes or diabetes — with a mg/dL and mmol/L conversion.

Break your daily calorie burn into resting energy and active energy, and see what share of TDEE comes from movement.

Work out how many tablets or capsules make up an ordered dose from the ordered amount and the strength of one tablet, using desired-over-have.

Find the millilitres to draw up for an ordered dose of a liquid medicine from its concentration, using the desired-over-have-times-quantity rule.

Convert a weight-based mcg/kg/min order into a pump rate in mL/hour from the patient weight and the bag concentration, or work back from a running mL/h to the dose; also handles mcg/min, mcg/kg/h, mg/kg/h, mg/min, mg/h and ng/kg/min, with a titration table and bag time.

Turn an hourly drug dose into a pump rate in mL/hour from the amount of drug in the bag and the bag volume — the concentration does the conversion.

Set a dopamine or dobutamine drip in mL/hour from a mcg/kg/min order, patient weight and a standard premix concentration, with the dose per minute shown.

Calculate a weight-based unfractionated heparin bolus and starting infusion in units, mL and mL/hour (VTE nomogram 80 units/kg + 18 units/kg/h, ACS 60 units/kg + 12 units/kg/h with maximums, or your protocol's doses and caps), then convert an aPTT result into the nomogram rate change.

Convert an IV insulin infusion order between units/hour and mL/hour for any bag concentration, apply a titration step as a new rate, a percentage or a units/h change, and see the pump-rate change, units/kg/h, 24-hour insulin and how long the bag lasts.

Find the concentration after reconstituting a powdered drug and the volume to draw for a dose, accounting for the powder’s displacement volume.

Check whether an ordered dose falls within a drug’s safe mg/kg range for the patient’s weight, with the low and high daily limits shown.

Work out how slowly to give an IV push — the millilitres and dose per 15-second interval — from the total volume, dose and the minimum push time.

Read how many units per hour a pump is delivering from its mL/hour rate and the bag concentration — the reverse of setting a units-per-hour order.

Convert a flow rate in mL/hour to drops per minute for a manual gravity IV set using the tubing’s drop factor — no volume or total time needed.

Turn a goal body-fat percentage into a target scale weight that keeps your lean mass, so you can plan a recomp instead of just cutting.

Estimate the extra calories your weekly mileage burns and the training-day intake target you need across a full marathon build.

Turn a daily fluid target into evenly spaced water reminders across your waking hours, with a glass count and reminder interval.

Add up the sleep you are missing each night and see how many nights of recovery it takes to clear your accumulated sleep debt.

Find a bedtime and wind-down time that fit your chronotype and target wake time, so you get a full night without fighting your body clock.

Pick the right nap length for your goal and get the wake time — a power nap for alertness or a full cycle for deeper recovery.

See how much evening screen time falls inside the wind-down window before bed and get a screen-off cutoff to protect your melatonin.

Apply the 20-20-20 rule to a screen session: how many eye breaks you should take, when they fall, and the total rest for your eyes.

See how many extra calories you burn by standing instead of sitting at your desk each day, week and year — and what that adds up to.

Build a desk-stretch routine for your workday: how many stretch breaks fit, the interval between them, and total stretching time.

Estimate the calories you burn by taking a meeting on foot, per session and per week, based on your weight, pace and duration.

Get the right monitor height and viewing distance for your setup — where the top of the screen and its centre should sit relative to your eyes.

Turn height and weight into a body-mass index and a plain-language note on how that BMI band relates to peri-operative and anesthetic risk.

Estimate your 10-year risk of coronary heart disease with the ATP III Framingham point system from age, cholesterol, HDL, blood pressure and smoking.

Estimate 10-year risk of heart attack or stroke with the 2013 ACC/AHA Pooled Cohort Equations, including the African American equations, cholesterol in mg/dL or mmol/L, risk with optimal risk factors, lifetime risk for ages 20–59 and what-if scenarios.

Estimate stroke risk in atrial fibrillation with the CHADS₂ score — one point each for heart failure, hypertension, age ≥75 and diabetes, two for prior stroke or TIA.

Assess the clinical probability of deep vein thrombosis with the Wells DVT criteria — nine clinical points, minus two when an alternative diagnosis is at least as likely.

Add the eye, verbal and motor responses into a Glasgow Coma Scale total from 3 to 15 and read the mild, moderate or severe impairment band.

Score a newborn 0–10 across appearance, pulse, grimace, activity and respiration to gauge condition at 1 and 5 minutes after birth.

Calculate the MELD 3.0 score used for US liver-transplant allocation since July 2023 (OPTN), plus MELD-Na and the original MELD, from bilirubin, INR, creatinine, sodium, albumin, sex and dialysis — with lab bounds applied, estimated 90-day survival, mortality bands and a term-by-term breakdown.

Estimate liver fibrosis risk with the non-invasive FIB-4 index from age, AST, ALT and platelet count — a first-line screen before elastography or biopsy.

Estimate insulin resistance from a single fasting glucose and fasting insulin with the HOMA-IR index used widely in research and screening.

Read where your TSH, free T4 and free T3 sit against typical or your own lab’s reference ranges, convert between ng/dL, pg/mL and pmol/L, see the combined TSH–FT4 pattern and the FT3:FT4 ratio in both unit systems, plus optional Jostel TSH index and SPINA research indices — a note, not a diagnosis.

Interpret an eye pressure (IOP) reading against the normal 10–21 mmHg range, adjust it for central corneal thickness (pachymetry), and optionally estimate the 5-year risk of glaucoma in ocular hypertension with the OHTS-EGPS points system. A risk note, not a diagnosis.

Enter your daily protein target and see how many servings of common plant foods — tofu, lentils, tempeh, seitan, beans — it takes to reach it.

Estimate your recommended daily iron (RDA) from sex, age and life stage, with the higher target that vegetarian and vegan diets call for.

Find your recommended daily calcium (RDA) from age and sex, and the tolerable upper limit you should stay under.

Estimate your recommended daily vitamin C from sex and smoking status, with the extra allowance smokers need and the safe upper limit.

Estimate your adequate intake (AI) of potassium from sex and life stage, and see how it compares to a banana.

Estimate your recommended daily magnesium (RDA) from sex and age, plus the safe upper limit for supplements.

See your adequate intake of ALA omega-3 by sex and a common EPA+DHA target, with how much oily fish it takes to reach it.

Turn your daily calories into an added-sugar limit in grams and teaspoons using the 10%-of-calories guideline and the AHA caps.

Convert your daily calories into a saturated-fat limit in grams using the 10%-of-calories guideline and the stricter 6% AHA heart target.

See a reference daily dietary-cholesterol limit for your risk profile and how it compares to common foods like eggs and shrimp.

Enter your workout start time and get suggested clock times for a pre-workout meal, a pre-workout snack and post-workout refueling.

Estimate grams of carbohydrate for your pre-workout meal and post-workout recovery from body weight, based on sports-nutrition targets.

Answer a few simple yes/no questions to estimate an older adult's fall-risk level, based on the CDC STEADI screening approach.

Estimate a simple frailty index and Fried phenotype category from five yes/no criteria used in geriatric research.

Compare a handgrip reading in kilograms to age- and sex-typical norms and the sarcopenia weakness cutoff.

Turn a timed walk (4 m, 6 m, 10 m or any distance) into gait speed in m/s, km/h and mph, average two trials, and compare it with age and sex norms, the 0.8 and 1.0 m/s thresholds, the SPPB gait score, the Fried frailty slowness criterion and the speed needed to cross at a signal.

Estimate a daily fluid target for an older adult from body weight using the common 30 mL/kg guideline, with a sensible minimum.

Estimate a daily protein target for older adults from body weight using PROT-AGE guidance, with a per-meal split.

Count regular medicines against the polypharmacy (5+) and hyperpolypharmacy (10+) thresholds, see the possible drug-pair load, tick high-risk medicine groups from the Beers and STOPP criteria to flag risky combinations, and get a medication-review suggestion.

Tally common clinical risk factors for low bone density and osteoporosis to see whether a bone scan discussion is warranted.

A quick yes/no self-screen for common vision and hearing difficulties in older adults, with a prompt on when to get tested.

An informant-style yes/no screen for recent changes in memory and thinking, modelled on the AD8, with a prompt on when to seek review.

See how smoking, activity and diet shift a rough life-expectancy estimate, adjusting a baseline by evidence-based year offsets.

Estimate a rough biological age by adjusting your chronological age for resting heart rate, activity and smoking.

Turn five quick self-ratings into a single 0–100 stress score with a plain-language reading you can track week to week.

Score your burnout risk across exhaustion, cynicism and reduced accomplishment on a 0–100 scale you can revisit.

Weigh your work hours against sleep, personal time and boundaries to get a 0–100 work-life balance score.

Combine your sleep duration, efficiency, awakenings and how rested you feel into a single 0–100 sleep quality score.

Set a realistic daily meditation target from your weekly goal and see the monthly and yearly minutes it adds up to.

Track your gratitude-journaling streak, your consistency rate, and how many days remain to hit your next milestone.

Average up to seven daily mood ratings into a weekly mood score with a range and simple trend reading.

Score how healthy your daily screen habits are from total hours, late-night use, phone pickups and the mix of active vs passive time.

Estimate how much social energy a day of interactions leaves you with, based on your temperament and how draining or recharging each activity is.

Estimate how long a new habit takes to feel automatic using the 66-day research average, adjusted for complexity and consistency.

See how many free hours you actually have after work, sleep and chores — and whether your self-care goal fits your week.

Build a realistic digital detox plan: daily screen-free blocks, a phone-free wind-down window, and the offline hours you reclaim each week.

Find which phase of your cycle you are in today — menstrual, follicular, ovulatory or luteal — from your cycle length and the day of your cycle.

Estimate the days each cycle when PMS symptoms are most likely — the late-luteal window before your next period — from your last period date and cycle length.

Estimate your likely menopause age and when perimenopause may begin, based on family history and smoking — the strongest everyday predictors.

Find your daily calcium target for bone health by age and life stage, compare it to your intake, and see how many dairy-equivalent servings close the gap.

See your recommended total pregnancy weight-gain range by pre-pregnancy BMI, plus how much you should have gained by your current week (IOM guidelines).

Estimate the extra calories to add for milk production while breastfeeding, based on your maintenance needs, how much you nurse, and any weight-loss goal.

Estimate daily calories after birth for recovery or gradual weight loss, using the Mifflin-St Jeor equation with a safe postpartum floor.

Find your daily iron target during pregnancy, breastfeeding or otherwise, compare it to your intake, and see the shortfall to discuss with your clinician.

Find your daily folate target in dietary folate equivalents (DFE) by age and life stage (general, trying to conceive, pregnant, breastfeeding), add up food folate, fortified foods and supplements in DFE, see the shortfall and the folic-acid upper limit, and the advised folic-acid supplement.

A simple gestational-diabetes risk screen from common factors — BMI, age, family history, prior GDM and PCOS — to see whether earlier testing may be warranted.

Compare typical-use and perfect-use failure rates of contraceptive methods and see the cumulative chance of pregnancy over several years.

Match your training to your menstrual cycle — see which phase you are in today and the strength, HIIT or recovery focus that suits your hormones.

Check whether your weekly mileage is ramping up too fast using the 10% rule and the acute:chronic workload ratio (ACWR).

Plan how long a foam-rolling routine takes from the number of muscle groups, seconds per group and rounds.

Score a simplified four-part movement screen (deep squat, shoulder, straight-leg raise, trunk stability) out of 12.

Estimate how long delayed-onset muscle soreness (DOMS) may take to resolve from soreness level, exercise type and training status.

Estimate calories burned during a light active-recovery session using MET values, your body weight and duration.

Compare how much session time foam rolling versus static stretching costs across the same set of muscle groups.

Estimate how much fluid to drink before, during and after a hot yoga class based on session length and sweat rate.

Estimate the heart-rate range heat stress raises you into during a sauna session, using the Karvonen (heart-rate reserve) method.

Get a suggested cold-plunge duration from water temperature and experience level, with a weekly cold-exposure target.

Plan a box-breathing (4-4-4-4) session: cycle length, breaths per minute and how many rounds fit your chosen duration.

Compare today’s heart-rate variability (HRV) with your personal baseline to see whether it is normal, elevated or suppressed.

Combine resting heart rate, sleep, soreness, mood and training-load changes into a simple overtraining risk score out of 100.

Read an eyeglass prescription: compute the spherical equivalent from sphere and cylinder, and see whether you are nearsighted, farsighted and astigmatic.

Turn a distance pupillary distance into near PD and single (monocular) PD values for ordering glasses online.

See how long your boxes of daily disposable contact lenses will last based on how many days a week you wear them.

Weigh your screen habits, evening exposure and eye-strain symptoms into a simple score for whether blue-light glasses are worth trying.

Estimate how often you may need a professional dental cleaning based on gum health, smoking, diabetes and plaque buildup.

Find your next toothbrush replacement date from when you last swapped it, how hard you brush and whether you have been ill.

Estimate how many whitening sessions it may take to reach your target tooth shade with strips, at-home trays or in-office treatment.

See how often to reapply sunscreen and a theoretical unprotected burn time based on SPF, your skin type and the UV index.

Tally common skin-cancer risk factors — skin type, sunburns, family history, tanning beds and mole count — into a simple awareness score.

Estimate the daily, weekly and yearly time your anti-ageing skincare routine takes based on steps, sunscreen and how many times a day you do it.

Interpret the Norwood scale of male-pattern hair loss: what your stage means and the approximate scalp coverage lost.

Build a healing timeline for a new tattoo — surface-healing date and full-healing window — based on size and skin type.

Estimate the calories in a typical restaurant meal by cuisine type, portion size and whether you add a drink, appetizer and dessert.

See how much of your daily calorie budget a fast food order uses and how many calories are left for the rest of the day.

Track how many calories your weekly drinking adds up to across beer, wine and spirits, and see the yearly weight-gain equivalent.

Estimate the calories in your coffee shop order from the milk, size, syrup pumps and whipped cream you add.

Compare your usual dessert with a lighter swap and see the calories saved per serving, per week and per year.

Turn your plate size and the healthy-plate method into target areas and rough calories for vegetables, protein and starch.

Estimate protein, carbs and fat targets in easy hand portions — palms, cupped hands, fists and thumbs — from your meal count.

Estimate the calories on your plate from how it is filled — vegetables, protein, starch and added fats — without weighing anything.

Work out how many calories you can spend on snacks after your meals, and how that splits across the number of snacks you have.

Estimate the calorie surplus of a holiday feast against your normal day and how long walking or eating lighter would offset it.

Estimate how many calories an all-you-can-eat buffet visit adds up to from the number of plates, dessert and drinks.

See how slowing your eating pace and chewing more per bite stretches a meal past the 20-minute fullness signal.

Estimate your total daily calorie burn (TDEE) from your step count: resting metabolism (entered or estimated with Mifflin-St Jeor), everyday movement, the net energy of your steps from stride and walking pace, other exercise and digestion — with a breakdown chart, step-count table and calorie targets.

Convert minutes of exercise at any intensity into calories burned using MET values and your body weight.

See how your resting heart rate compares for your age and sex, and what it suggests about cardiovascular fitness.

Turn a VO2max number into a fitness percentile category based on age and sex norms.

Estimate your "fitness age" from your VO2max relative to what is typical for your chronological age.

Plan weekly working sets across a push/pull/legs split and check each muscle group against evidence-based volume targets.

Find next week’s safe mileage ceiling from your current volume using the 10% progression rule.

Total the foot contacts in a plyometric session and check them against experience-based volume guidelines.

Build a stretching session by turning a list of target areas and hold times into total weekly mobility minutes.

Get a recommended cooldown length after a workout, scaled by how hard and how long the session was.

Estimate how many minutes to warm up before a session based on the workout type, its intensity and the temperature.

Estimate how many recovery days a hard session needs from its intensity, duration and your training experience.

Find your daily creatine monohydrate maintenance dose from body weight — plus the optional loading amount — using the standard 0.03 g/kg guideline.

Work out how many scoops of protein powder you need to top up from the food you already eat to your daily protein target.

Scale a safe caffeine dose to your body weight — the 3–6 mg/kg performance range and where the 400 mg daily cap sits for you.

Estimate the daily vitamin D3 dose needed to raise your blood 25(OH)D level from where it is now to your target, using the ~100 IU per ng/mL rule of thumb.

Count how many fish oil capsules deliver your daily EPA + DHA target — the omega-3 amounts that actually matter, not the total fish oil on the label.

Convert an elemental magnesium target into the actual compound milligrams you need — because oxide, citrate and glycinate carry very different amounts of usable magnesium.

Mix your own oral rehydration drink — how much salt, sugar and potassium to add per litre of water to hit a target sodium concentration.

Time your pre-workout caffeine so it peaks during training — and see how much is still in your system at bedtime given caffeine’s ~5-hour half-life.

See the daily collagen peptide dose typically studied for your goal — skin, joints, bone or general use — in an easy at-a-glance range.

Find how much fiber supplement to add — in grams and teaspoons — to reach your daily fiber goal after counting the fiber in your food.

Add up the daily CFU count from your probiotic servings and see where it sits against typical everyday and higher therapeutic ranges.

Work out how many servings are in a tub of greens powder, how long it lasts and what it costs per day at your chosen scoop size.

Enter your current weight, goal weight and how many weeks you have — get the daily calorie target that gets you there on time.

Treat calories like a weekly budget: bank a little on ordinary days so you can flex on one or two without breaking your average.

Eating in a deficit? See the higher protein target that helps preserve muscle while you lose fat, in grams per day and per meal.

Split your daily calories across the meals and snacks you actually eat, so each sitting has a realistic calorie budget.

Drinking water before meals can blunt appetite — see how much a pre-meal glass adds up to across your day.

See how long a daily step goal takes to reach a weight-loss target, from your weight, height and walking pace — with only the extra steps counted, an optional diet deficit, a goal date, a weekly plan and a chart.

Set a standing goal and see the extra calories that swapping sitting for standing burns each day, week and year.

Built up a sleep debt? See how many nights of extra sleep it takes to pay it back at a comfortable pace.

Score your daily life against the nine longevity habits shared by the world’s longest-lived communities.

Turn six evidence-backed daily habits — exercise, sleep, diet, smoking, alcohol and connection — into one healthy-habit score.

Give comfort food a planned slice of your day so stress eating fits your calories instead of derailing them.

See how quietly shrinking your usual portions by a small percentage adds up to real weight loss over weeks.

Estimate how many grams of protein to eat per day based on your body weight and activity goal.

Estimate calories burned cycling from your weight, ride time and intensity — by speed band, exact average speed, bike type (mountain, BMX, e-bike, spin class, stationary) or indoor power in watts — using 2024 Compendium of Physical Activities METs, with gross and net calories, per hour, per km and tables by speed and duration.

Measure your sweat rate from weight lost during exercise and learn how much to drink per hour.

Turn a recent 5K time into easy, marathon, threshold, interval and repetition training paces.

Get calorie, protein, fat and carb targets for a fat-loss cut: enter your maintenance calories or estimate them, set the deficit as a percentage or a weekly loss rate, base protein on body weight or lean mass, and see weekly loss, time to your goal weight and macros per meal.

Calculate your DOTS powerlifting score to compare strength across body weights and sexes.

Turn your cycling FTP into the seven Coggan power training zones in watts.

Convert a rowing distance and time into your average /500m split and power in watts.

Estimate calories burned swimming from your weight, time in the water and stroke — freestyle, backstroke, breaststroke, butterfly, sidestroke, treading water, open water, water aerobics or aqua jogging — or from the distance you swam, using 2024 Compendium of Physical Activities METs, with gross and net calories, pace, per-hour rates and a stroke comparison.

Find your recommended daily fiber in grams based on how many calories you eat.

See your added-sugar limit in grams and teaspoons based on your daily calories.

Find the best nap length for the time you have, and how long to actually set your alarm for.

Estimate a healthy target racing weight range for endurance sport from your height.

Stroke risk in atrial fibrillation with the CHA₂DS₂-VASc score — congestive heart failure, hypertension, age, diabetes, prior stroke, vascular disease and sex — with annual stroke rate and anticoagulation guidance.

Major bleeding risk on anticoagulation with the HAS-BLED score — hypertension, renal or liver disease, stroke, bleeding history, labile INR, elderly, drugs or alcohol — with annual bleeding rate.

Risk-stratify emergency chest pain with the HEART score — History, ECG, Age, Risk factors, Troponin — with 6-week major adverse cardiac event rates and disposition guidance.

Pre-test probability of pulmonary embolism with the Wells criteria — three-tier and two-tier results with published PE prevalence, simplified Wells, YEARS items, standard or age-adjusted D-dimer cut-off with your D-dimer value (FEU or DDU), and an optional PERC rule check.

Rule out pulmonary embolism without testing in low-risk patients using the eight PERC criteria — age, heart rate, oxygen saturation, leg swelling, haemoptysis, surgery, prior VTE, oestrogen use.

Objective pre-test probability of pulmonary embolism with the revised Geneva score — age, prior VTE, surgery, cancer, leg pain, haemoptysis, heart rate and leg examination — three-level and simplified versions.

Prognosis after confirmed pulmonary embolism with the simplified Pulmonary Embolism Severity Index — age, cancer, cardiopulmonary disease, heart rate, blood pressure, oxygen saturation — 30-day mortality and outpatient eligibility.

Shock index (heart rate ÷ systolic blood pressure), modified shock index and age-adjusted shock index — early warning of haemorrhage, sepsis and occult shock before blood pressure falls.

Early stroke risk after a transient ischaemic attack with the ABCD² score — age, blood pressure, clinical features, duration and diabetes — 2-day, 7-day and 90-day stroke risk.

Post-operative venous thromboembolism risk with the Caprini score — age, surgery type, medical conditions, mobility, hormones, prior VTE, thrombophilia — with recommended prophylaxis level.

Venous thromboembolism risk for hospitalised medical patients with the Padua Prediction Score — active cancer, prior VTE, reduced mobility, thrombophilia, trauma, age, heart or respiratory failure, MI or stroke, infection, obesity, hormones.

Calculate LDL cholesterol from total cholesterol, HDL and triglycerides with the Friedewald equation (LDL = TC − HDL − TG/5) and the more accurate Martin-Hopkins and Sampson equations, plus non-HDL cholesterol.

Community-acquired pneumonia severity and 30-day mortality with CURB-65 — confusion, urea, respiratory rate, blood pressure, age 65 — with outpatient, ward or ICU guidance and the CRB-65 variant.

NEWS2 early-warning score from respiratory rate, oxygen saturation (scale 1 or 2), supplemental oxygen, systolic BP, pulse, consciousness and temperature — with the clinical response and escalation trigger.

Quick SOFA bedside sepsis screen — respiratory rate ≥ 22, altered mentation, systolic BP ≤ 100 — with SIRS criteria comparison and the Sepsis-3 interpretation.

SOFA score across six organ systems — PaO₂/FiO₂, platelets, bilirubin, blood pressure or vasopressors, Glasgow Coma Scale and creatinine or urine output — with Sepsis-3 interpretation and mortality estimate.

Count the 4 SIRS criteria (temperature, heart rate, respiratory rate or PaCO₂, white cell count or bands) in °C or °F, then check sepsis, severe sepsis and septic shock with the SEP-1 organ-dysfunction list, plus qSOFA and the Sepsis-3 shock criteria.

Likelihood of group A streptococcal pharyngitis with the modified Centor (McIsaac) score — tonsillar exudate, tender anterior nodes, fever, absence of cough, age — with rapid-test and antibiotic guidance and the FeverPAIN alternative.

Alveolar-arterial oxygen gradient from the alveolar gas equation — FiO₂, barometric pressure, PaCO₂, PaO₂ — with age-adjusted normal values to separate hypoventilation from V/Q mismatch, shunt and diffusion defects.

P/F ratio (PaO₂ ÷ FiO₂) in mmHg or kPa with Berlin and 2023 global ARDS oxygenation categories, the SpO₂/FiO₂ ratio and its cut-offs, the support needed for the criterion (ventilation, NIV/CPAP, high-flow oxygen), altitude-corrected P/F, the SOFA respiratory points and FiO₂ estimates for cannulas and masks.

Oxygenation index (FiO₂ × mean airway pressure ÷ PaO₂) and oxygen saturation index for ventilated patients — paediatric ARDS severity, ECMO thresholds and neonatal criteria.

Expected PaCO₂ in metabolic acidosis from Winter’s formula (1.5 × HCO₃⁻ + 8 ± 2) — detect a concurrent respiratory acidosis or alkalosis — plus expected compensation for metabolic alkalosis and respiratory disorders.

Child-Pugh class A, B or C from bilirubin, albumin, INR, ascites and encephalopathy — one- and two-year survival, operative mortality and drug-dosing implications in cirrhosis.

Non-invasive liver fibrosis estimate with the APRI score — AST relative to its upper limit of normal divided by platelet count — with cut-offs for significant fibrosis and cirrhosis in hepatitis C, hepatitis B and fatty liver.

Glasgow-Blatchford bleeding score for upper gastrointestinal haemorrhage — urea, haemoglobin, blood pressure, pulse, melaena, syncope, liver disease, heart failure — with outpatient-safe threshold and intervention risk.

Ranson score for acute pancreatitis severity — five admission criteria and six 48-hour criteria for non-gallstone and gallstone pancreatitis — with predicted mortality.

Likelihood of acute appendicitis with the Alvarado (MANTRELS) score — migration of pain, anorexia, nausea, RLQ tenderness, rebound, fever, leukocytosis, neutrophil shift — with imaging and surgical guidance.

Calculated serum osmolality from sodium, glucose and urea or BUN (2 × Na + glucose + urea, or the Dorwart 1.86 × Na + 9 variant) in mmol/L or mg/dL, with ethanol correction, the osmolar gap against measured osmolality, effective osmolality (tonicity) for HHS, and the toxic alcohol level a gap could represent.

Correct measured sodium for hyperglycaemia (Katz 1.6 and Hillier 2.4 mmol/L per 100 mg/dL of glucose) to reveal true sodium status in DKA and hyperosmolar hyperglycaemic state.

Free water deficit in hypernatraemia from total body water, current and target sodium — with safe correction rate (≤ 10–12 mmol/L per day), hourly infusion rate and ongoing losses.

Predict the change in serum sodium per litre of infusate with the Adrogue-Madias formula — 3% saline, 0.9% saline, 0.45% saline, D5W — infusion rate to hit a safe hourly and 24-hour target in hyponatraemia or hypernatraemia.

Fractional excretion of sodium from urine and serum sodium and creatinine (µmol/L, mmol/L or mg/dL) — prerenal (< 1%), indeterminate or intrinsic AKI (> 2%) — with the optional FEUrea for patients on diuretics, the renal failure index, urine/plasma creatinine and BUN/creatinine ratios, and a worked solution.

Fractional excretion of urea from urine and serum urea and creatinine — the diuretic-resistant alternative to FENa for separating prerenal AKI (< 35%) from acute tubular necrosis (> 50%).

Transtubular potassium gradient from urine and serum potassium and osmolality — assess renal potassium handling in hyperkalaemia (expect > 7) and hypokalaemia (expect < 3) and detect hypoaldosteronism.

Urine anion gap (Na + K − Cl) to distinguish renal tubular acidosis from gastrointestinal bicarbonate loss in normal-anion-gap metabolic acidosis, with the urine osmolar gap as a check.

Estimate the bicarbonate deficit in metabolic acidosis with the fixed 0.3/0.4/0.5 × weight space, the dynamic Kurtz or Kollef space, or the base-deficit method; choose actual or ideal body weight, the share to give first and the product (8.4%, 4.2%, 1.4%, 1.26%), and get the dose, volume, 50 mL ampoules, infusion rate and sodium load.

Calcium × phosphate product in mg²/dL² and mmol²/L² for chronic kidney disease and dialysis, from mg/dL or mmol/L results: the KDOQI threshold of 55, the high-risk level of 70, albumin-corrected calcium, calcium and phosphate against their normal ranges, the phosphate that keeps the product under 55, and what KDIGO 2017 recommends instead.

Transferrin saturation (TSAT) from serum iron with TIBC, UIBC or transferrin (µg/dL or µmol/L; mg/dL or g/L) — with interpretation for iron deficiency (< 16–20%) and overload (> 45%), a ferritin pattern adjusted for inflammation and sex, and the heart-failure (ESC) and CKD (KDIGO 2026) iron criteria.

Total iron deficit by the Ganzoni formula — weight × (target − actual haemoglobin) × 2.4 + iron stores — in g/dL, g/L or mmol/L, with actual or ideal body weight, the Ferinject and Monofer simplified-table doses and an infusion plan split by the chosen product’s maximum single dose.

Estimate total blood volume with Nadler’s equations from height, weight and sex — plus plasma and red cell volume from haematocrit, allowable blood loss and the 70 mL/kg rule of thumb.

Corrected reticulocyte count and reticulocyte production index (RPI) from reticulocyte %, haematocrit and maturation time — tells whether an anaemia is hypoproliferative (RPI < 2) or a marrow response to loss or haemolysis (RPI > 3).

Absolute neutrophil count from total white cell count and the percentages of segmented neutrophils and bands — neutropenia grading (mild, moderate, severe), chemotherapy CTCAE grades and febrile neutropenia thresholds.

Mentzer index (MCV ÷ RBC count) to separate beta-thalassaemia trait (< 13) from iron-deficiency anaemia (> 13) in microcytic anaemia, with the Green-King, England-Fraser and RDW indices.

Triglyceride-glucose (TyG) index as a surrogate for insulin resistance — ln(TG × glucose ÷ 2) — with cut-offs, TyG-BMI and TyG-waist variants and comparison to HOMA-IR.

Paediatric maintenance IV fluid rate by the Holliday-Segar method — 100/50/20 mL/kg per day and the 4-2-1 hourly rule — with an adult cap, reduced or increased maintenance, dehydration deficit and ongoing losses, an hour-by-hour rate plan, drip rate, glucose infusion rate, sodium delivered and daily sodium and potassium requirements.

Endotracheal tube size for children from age — Cole formula for uncuffed (age/4 + 4), Khine for cuffed (age/4 + 3.5) — with insertion depth at the lip (age/2 + 12), nasal depth, suction catheter and laryngoscope blade suggestions.

Total body surface area burned by the Wallace rule of nines for adults and the paediatric (Lund-Browder) adjustment — with Parkland fluid resuscitation volume and burn-centre referral criteria.

Score the nine-item Patient Health Questionnaire for depression severity — minimal, mild, moderate, moderately severe, severe — with the PHQ-2 screen and treatment-response thresholds.

Score the seven-item Generalised Anxiety Disorder scale — minimal, mild, moderate, severe anxiety — with the GAD-2 screen and sensitivity for panic, social anxiety and PTSD.

Score the eight-situation Epworth Sleepiness Scale (0–24) for daytime sleepiness — normal, mild, moderate and severe excessive sleepiness — with sleep apnoea and narcolepsy implications.

Obstructive sleep apnoea risk with the STOP-BANG questionnaire — snoring, tiredness, observed apnoeas, pressure, BMI over 35, age over 50, neck over 40 cm, male gender — with low, intermediate and high risk interpretation.

Daily macros for a carb-cycling plan — high, moderate and low-carb days from your maintenance calories, goal and training schedule — with protein and fat kept steady and a weekly total.

Calories burned in a high-intensity interval session from work/rest intervals, intensity and body weight — including the EPOC afterburn — compared with steady cardio of the same duration.

Calories burned on an elliptical trainer from duration, resistance/effort level and body weight — with the machine-readout correction, distance equivalent and comparison with running and cycling.

Estimate the calories burned by daily non-exercise movement — steps, standing hours, housework, fidgeting and occupation — and how much raising NEAT could add to your daily burn.

Calories burned in a kettlebell session from body weight, bell weight, swings per minute and work/rest pattern — total swings, tonnage lifted and comparison with the ACE 20-kcal-per-minute figure.

Calories burned doing burpees from your body weight, reps or sets and pace — using 2024 Compendium of Physical Activities METs — per burpee, per minute and per workout, with rest periods, burpee variations, net calories, burpees needed for a calorie goal, weekly totals and the 100-burpee challenge.

Estimate VO₂max from the Rockport 1-mile walk test — time, finishing heart rate, age, sex and weight — with fitness category by age and comparison to Cooper and step tests.

Rate your cardiovascular fitness from the YMCA 3-minute step test recovery heart rate — with age and sex norms from very poor to excellent, plus the Queens College step test VO₂max estimate.

Recommended weight limit and lifting index from the revised NIOSH lifting equation — horizontal and vertical location, travel distance, asymmetry, frequency and coupling multipliers — with risk interpretation for manual handling tasks.

Wet-bulb globe temperature from measured natural wet-bulb, globe and air temperatures, or estimated from weather (air temperature, humidity, wind and sun) with the Liljegren model used by OSHA, plus ACGIH work/rest limits, NIOSH REL/RAL, clothing adjustment and heat flag category.

Daily noise dose and 8-hour time-weighted average from up to four exposures — OSHA (90 dBA, 5 dB exchange), NIOSH/ISO (85 dBA, 3 dB exchange) — with allowed duration at each level and hearing-protection needs.

Convert a glasses prescription to contact-lens power (or back) with vertex-distance compensation for sphere, cylinder and axis, one or both eyes, with contact-lens rounding, spherical equivalent, a vertex table and diopter ↔ focal-length conversion.

Induced prism by Prentice’s rule for one lens or both eyes (sphere, cylinder and axis, PD mismatch, reading-level vertical imbalance) with net prism and ANSI tolerance, the decentration needed for a prescribed prism, prism diopters ↔ degrees, and compounding or resolving oblique prism in 360° notation.

Turn a children’s mg/kg/day or mg/kg/dose order into milligrams and millilitres per dose, capped at the maximum single and daily dose, rounded down to what your oral syringe can measure, with the dosing interval, tablets per dose, a prescribed-dose check and the bottle size for the course.

Weight-based ibuprofen dose for children (5–10 mg/kg, at most 400 mg a dose) in mL of 100 mg/5 mL or 200 mg/5 mL suspension, infant drops or tablets, with the 24-hour maximum under US (FDA/AAP) or UK (NHS) rules, the package-chart dose for comparison, the earliest times for the next doses and an optional paracetamol/acetaminophen dose for alternating.

Estimate a child’s weight from age when scales are unavailable — APLS/UK formulae, the classic (age + 4) × 2, the Best Guess and Luscombe formulas, WHO median for infants, with the resulting fluid bolus, adrenaline and defibrillation figures for emergencies.

Urine output in mL/kg/hour for infants and children from measured volume, weight and hours — compared with the normal thresholds (≥ 1 mL/kg/h child, ≥ 2 infant), oliguria and AKI criteria, expected daily output and wet-nappy equivalents.

Estimated total blood volume for neonates, infants and children by age (mL/kg), the packed red cell volume needed to raise haemoglobin to a target, the expected rise per 10 mL/kg, allowable blood loss to a minimum haematocrit and platelet/FFP dose.

Days supply of a prescription from quantity dispensed and the sig (dose × frequency), for tablets, liquids (mL and mg/mL), insulin and injectables (units per vial or pen), inhalers (puffs per canister) and eye drops (drops per mL) — with the refill-due date and the quantity for a 30- or 90-day fill.

Convert a milligram dose to millilitres (or millilitres back to milligrams) for an oral liquid or injectable from its concentration — mg per mL, mg per 5 mL, % w/v or common product strengths — with syringe rounding, the dose actually delivered, directions, course volume, bottles to dispense, beyond-use date check and an optional mg/kg check.

Calculate the incidence rate per 1,000 or 100,000 person-years with an exact Poisson confidence interval, the cumulative incidence (risk) over follow-up, risk from the rate, implied prevalence from disease duration, and an incidence rate ratio and rate difference against a comparison group.

Analyse a point-source outbreak 2×2 table: food-specific attack rates for eaters and non-eaters, overall attack rate, risk ratio and risk difference with 90/95/99% confidence intervals, odds ratio, chi-square and Fisher exact p-values, attributable fractions and the household secondary attack rate.

Calculate the herd immunity threshold from the basic reproduction number (1 − 1/R₀), the vaccination coverage needed given vaccine effectiveness, the effective reproduction number at current immunity, R from epidemic growth rate and serial interval, the final epidemic size, and comparison with measles, COVID-19, influenza and other diseases.

Calculate vaccine efficacy from cases in vaccinated and unvaccinated groups (1 − relative risk) with a 95% confidence interval, absolute risk reduction and number needed to vaccinate, the test-negative/case-control form (1 − odds ratio), the screening method from the proportion of cases vaccinated, and what the numbers mean for the individual.

Calculate the naive case fatality rate, the delay-adjusted CFR using cases from an earlier date, the infection fatality rate from seroprevalence or an ascertainment ratio, the 95% confidence interval, and how testing coverage and reporting lag bias each measure during an outbreak.

Compare two health interventions: quality-adjusted life years from life expectancy and utility weights, incremental cost-effectiveness ratio (cost per QALY gained), net monetary benefit at a willingness-to-pay threshold ($50k, $100k, £20–30k), dominance, and the cost-effectiveness plane quadrant.

Interpret a radon test: convert between pCi/L and Bq/m³, compare with the EPA action level (4 pCi/L / 148 Bq/m³) and the WHO reference (100 Bq/m³), see the EPA lifetime lung-cancer risk per 1,000 people for smokers and never-smokers at your level, how much a short-term test may differ from the annual average, and the sub-slab fan and pipe a mitigation system typically needs.

Score the NIH Stroke Scale item by item — consciousness, gaze, visual fields, facial palsy, motor, ataxia, sensory, language, dysarthria and neglect — total 0–42 with stroke severity.

Score the Barthel Index of activities of daily living — feeding, bathing, grooming, dressing, bowels, bladder, toilet, transfers, mobility and stairs — 0 to 100 with the level of dependence.

Score the WHO AUDIT 10-question alcohol use test — total 0–40 with the four WHO risk zones, the AUDIT-C consumption score and the suggested level of intervention.

Score post-anesthesia recovery with the modified Aldrete score — activity, respiration, circulation, consciousness and oxygen saturation — total 0–10 and the usual 9-point discharge criterion.

Score the Clinical Institute Withdrawal Assessment for Alcohol, revised (CIWA-Ar) — 10 items from nausea and tremor to orientation — total 0–67 with withdrawal severity.

Score the Clinical Opiate Withdrawal Scale (COWS) — pulse, sweating, restlessness, pupils, aches, rhinorrhea, GI upset, tremor, yawning, anxiety and gooseflesh — with mild to severe withdrawal bands.

Score the Braden Scale for predicting pressure injury (pressure ulcer) risk — sensory perception, moisture, activity, mobility, nutrition, friction and shear — total 6–23 with the risk level.

Score the Morse Fall Scale for hospital patients — history of falling, secondary diagnosis, ambulatory aid, IV or heparin lock, gait and mental status — total 0–125 with the fall risk level.

Bedside Index of Severity in Acute Pancreatitis (BISAP) — BUN, impaired mental status, SIRS, age over 60 and pleural effusion in the first 24 hours — with in-hospital mortality by score.

Rockall score for acute upper gastrointestinal bleeding — age, shock, comorbidity, endoscopic diagnosis and stigmata of recent haemorrhage — pre-endoscopy and complete score with mortality.

Simplified Apfel score for postoperative nausea and vomiting (PONV) in adults — female sex, non-smoker, history of PONV or motion sickness, postoperative opioids — with the 24-hour PONV risk.

Total daily morphine milligram equivalents (MME/day) for up to three opioids with CDC 2022 conversion factors — oxycodone, hydrocodone, hydromorphone, methadone, fentanyl patch, tramadol and more.

Convert a corticosteroid dose to its equivalent anti-inflammatory dose of another steroid — prednisone, prednisolone, methylprednisolone, dexamethasone, hydrocortisone, betamethasone and more.

Score the Fagerström Test for Nicotine Dependence (FTND) — six questions on time to first cigarette, cigarettes per day and smoking habits — total 0–10 with the level of nicotine dependence.

Score the 15-item Geriatric Depression Scale (Yesavage short form) for older adults — yes/no answers, total 0–15, normal to severe depression bands and the usual cut-off of 5.

Score the FLACC behavioural pain scale for infants, young children and non-verbal patients — Face, Legs, Activity, Cry and Consolability — total 0–10 with the pain level.

Score the International Prostate Symptom Score (IPSS / AUA symptom index) — seven urinary symptom questions plus the quality-of-life question — with mild, moderate or severe symptoms.

Score newborn respiratory distress with the Silverman-Andersen index — chest movement, intercostal and xiphoid retraction, nasal flaring and expiratory grunt — total 0–10 with severity.

Convert a semaglutide dose in mg to mL and U-100 insulin syringe units for a compounded vial, from the mg/mL on the label or the mg of powder and water you add — with the full titration table and a syringe check.

Convert a tirzepatide dose in mg to mL and U-100 insulin syringe units for a compounded vial, from the vial mg/mL or the powder and water you mix, with the 2.5 mg to 15 mg titration table and a syringe-size check.

Work out a child's amoxicillin dose by weight: mg per dose and mL of 125, 200, 250 or 400 mg/5 mL suspension for ear infections (high dose), strep throat and other infections, using the FDA label and AAP/IDSA dosing with adult caps.

Find the label dose of children's cetirizine, loratadine, fexofenadine or diphenhydramine liquid by age: mL and mg per dose, how often and the 24-hour maximum, following the OTC product labels.

Enter your semen analysis results to get the total sperm count, total motile sperm count (TMSC) and progressive motile count, and compare each value with the WHO 2021 lower reference limits — with what the TMSC usually means for fertility treatment.

Turn a DXA bone mineral density (g/cm²) into a T-score against the NHANES III young-adult reference for the femoral neck or total hip, see the WHO category (normal, osteopenia, osteoporosis) and the BMD at each cut-off.

Find when your next cervical cancer screening is due — Pap test every 3 years, HPV or co-test every 5 years — from your age, last test date, test type and result, using USPSTF or American Cancer Society guidelines.

Find when your next screening mammogram is due from your age and last mammogram date, under USPSTF 2024, American Cancer Society, American College of Radiology or European (ECIBC) guidelines, with high-risk advice.

Estimate expected weight loss on semaglutide 2.4 mg (Wegovy) or tirzepatide 5, 10 or 15 mg (Zepbound) week by week, from the average results of the STEP 1 and SURMOUNT-1 trials, compared with lifestyle changes alone.

Missed or late birth control pill? Get the CDC steps for combined pills, progestin-only (norethindrone, norgestrel) and drospirenone pills: what to take now, whether you need backup contraception or emergency contraception, and the next pack.

Find when your IUD or birth control implant expires — hormonal IUDs (52 mg, 19.5 mg, 13.5 mg levonorgestrel), copper IUD, etonogestrel or levonorgestrel implant — from the insertion date, with approved and extended-use durations.

Estimate body-fat percentage with the Body Adiposity Index (BAI) from hip circumference and height — no scale needed — and see the healthy range for your age and sex.

Estimate your body-fat percentage with the Relative Fat Mass (RFM) formula from just height and waist circumference, with the ACE body-fat category for your sex.

Calculate body-fat percentage from seven caliper skinfolds (chest, midaxillary, triceps, subscapular, abdomen, suprailiac, thigh) with the Jackson-Pollock 7-site equations and the Siri and Brozek formulas.

Estimate body fat from four skinfolds — biceps, triceps, subscapular and suprailiac — with the Durnin-Womersley (1974) age- and sex-specific equations and the Siri formula.

Turn underwater (hydrostatic) weighing results into body density and body-fat percentage with the Siri and Brozek equations, correcting for water temperature and residual lung volume.

Estimate body-fat percentage from BMI, age and sex with the Deurenberg equation (adults and children) and the CUN-BAE equation from the University of Navarra — no tape or calipers needed.

Estimate skeletal muscle mass in kg from weight, height, age, sex and ancestry with the Lee equation, plus muscle as a percentage of body weight and the skeletal muscle index used to screen for sarcopenia.

Calculate the thermic effect of food — the calories your body burns digesting protein, carbohydrate, fat and alcohol — from your daily macros, with a low–high range and TEF as a share of intake.

Convert grams of sugar on a nutrition label into teaspoons, tablespoons and sugar cubes, with the calories and how much of the WHO and AHA daily added-sugar limits it uses.

Work out a food's calorie (energy) density in kcal per gram from its label, classify it from very low to high as in the Volumetrics approach, and see how much you can eat for 100 or 500 kcal.

Compare your 6-minute walk test distance with the predicted normal value for your age, sex, height and weight (Enright & Sherrill equations), with percent of predicted and the lower limit of normal.

Score the Mini-Cog dementia screen — 3-word recall (0–3) plus the clock-drawing test (0 or 2) — for a total of 0–5 with the standard cut-off of under 3 and the more sensitive cut-off of under 4.

Score the Mini Nutritional Assessment Short Form (MNA-SF) for older adults — intake, weight loss, mobility, acute illness, cognition and BMI or calf size — 0 to 14 with nutritional status.

Score the Lawton–Brody Instrumental Activities of Daily Living (IADL) scale — telephone, shopping, cooking, housework, laundry, transport, medicines and money — 0 to 8 with the level of dependence.

Score the Katz Index of Independence in Activities of Daily Living — bathing, dressing, toileting, transferring, continence, feeding — 0 to 6, with status and Katz grade A to G.

Score the Tinetti Performance-Oriented Mobility Assessment (POMA): balance 0–16 plus gait 0–12 for a total of 0–28, with fall risk — high at 18 or less, moderate at 19–23, low at 24 or more.

Score the PHQ-4 ultra-brief screen for anxiety and depression: the GAD-2 and PHQ-2 subscales (positive at 3 or more) and the 0–12 total for normal, mild, moderate or severe psychological distress.

Score the CAGE alcohol questionnaire — Cut down, Annoyed, Guilty, Eye-opener — 0 to 4, where 2 or more yes answers is clinically significant and calls for a fuller alcohol assessment.

Score the 10-item Drug Abuse Screening Test (DAST-10) for the past 12 months — 0 to 10 with the degree of drug-related problems (none, low, moderate, substantial, severe) and the suggested next step.

Apply the Canadian CT Head Rule to adults with minor head injury (GCS 13–15 with loss of consciousness, amnesia or disorientation): 5 high-risk and 2 medium-risk findings decide on CT.

Apply the Ottawa Ankle Rules after an ankle or foot injury — malleolar and midfoot pain, bone tenderness and the 4-step weight-bearing test — to see whether an ankle or foot X-ray series is indicated.

Apply the PECARN pediatric head trauma rule for children with GCS 14–15 — separate branches for under 2 and age 2+ — to see if CT, observation or no CT is advised, with ciTBI risk.

Work through the CAM-ICU delirium assessment: RASS, acute change or fluctuation, inattention (letters test), altered consciousness and disorganised thinking — with motor subtype.

Score the Norton pressure ulcer risk scale — physical and mental condition, activity, mobility and incontinence — 5 to 20, where 14 or less means at risk, with low to very high bands.

Work out the Malnutrition Universal Screening Tool (MUST) score from BMI, unplanned weight loss in 3–6 months and acute illness — 0 low, 1 medium, 2+ high risk — with the BAPEN action.

Calculate the DAS28 rheumatoid arthritis activity score with ESR or CRP from 28 tender and swollen joint counts and patient global health — remission, low, moderate or high activity.

Score the Oswestry Disability Index for low back pain — ten sections from pain intensity to travelling, each 0–5 — as a percentage with the Fairbank disability band, allowing for skipped sections.

Calculate the age-adjusted Charlson Comorbidity Index from age and 19 weighted conditions — heart, lung, liver, kidney disease, diabetes, cancer, AIDS — with the estimated 10-year survival.

Score the Pfeiffer Short Portable Mental Status Questionnaire (SPMSQ): count the errors on 10 questions, adjust for education and read intact, mild, moderate or severe cognitive impairment.

Score the Downton Fall Risk Index — previous falls, medicines, sensory deficits, mental state and gait — 0 to 11, where 3 or more means a high risk of falling.

Calculate the TIMI risk score for unstable angina or NSTEMI — seven criteria from age 65+ to positive cardiac markers — with the 14-day risk of death, heart attack or urgent revascularisation.

Calculate the delta ratio (ΔAG/ΔHCO₃⁻), delta gap and corrected bicarbonate from sodium, chloride, bicarbonate and albumin to spot mixed acid-base disorders in a high anion gap acidosis.

Calculate arterial oxygen content (CaO₂) from hemoglobin, SaO₂ and PaO₂, plus oxygen delivery (DO₂), venous content, oxygen consumption and extraction ratio — in SI (g/L, kPa) or US units.

Convert blood glucose between mg/dL and mmol/L (divide or multiply by 18) and see where the reading falls for a fasting, 2-hour or random test, with a quick conversion chart.

Convert total, LDL, HDL and non-HDL cholesterol (factor 38.67) and triglycerides (factor 88.57) between mg/dL and mmol/L, with the NCEP ATP III category for each result.

Convert serum or urine creatinine between mg/dL, µmol/L and mmol/L (1 mg/dL = 88.42 µmol/L), with typical adult reference ranges and a quick conversion chart.

Convert blood urea nitrogen (BUN, mg/dL) to urea in mmol/L or mg/dL and back: urea mmol/L = BUN × 0.357 and urea mg/dL = BUN × 2.14, with the usual adult reference range.

Calculate the BUN-to-creatinine ratio from BUN and creatinine in mg/dL or from urea (mmol/L) and creatinine (µmol/L), with the SI urea:creatinine ratio and what high or low values suggest.

Convert a 25-hydroxyvitamin D blood level between ng/mL and nmol/L (1 ng/mL = 2.496 nmol/L) and see the deficiency, insufficiency and sufficiency bands used by the Endocrine Society and the IOM.

Calculate the urine albumin-to-creatinine ratio (UACR/ACR) in mg/mmol and mg/g from a spot urine sample and see the KDIGO albuminuria category (A1, A2 or A3).

Estimate GFR from cystatin C with the CKD-EPI 2012 cystatin C equation and the race-free CKD-EPI 2021 creatinine–cystatin C equation, compared with creatinine alone, plus the KDIGO G stage.

Calculate the vancomycin 24-hour AUC from two steady-state levels (peak and trough) with the Sawchuk-Zaske equations, plus ke, half-life, Vd, clearance and the dose that reaches an AUC of 400–600.

Calculate extended-interval (once-daily) gentamicin, tobramycin or amikacin doses: 7 or 15 mg/kg on the right dosing weight, with the Hartford interval from Cockcroft-Gault creatinine clearance.

Calculate the carboplatin dose with the Calvert formula — dose (mg) = target AUC × (GFR + 25) — from a measured GFR or Cockcroft-Gault creatinine clearance, with the FDA cap of GFR 125 mL/min.

Turn a dose per square metre (mg/m²) into a total dose from height and weight with the Mosteller BSA, or scale an adult dose to a child with the BSA ÷ 1.73 rule, with an optional 2.0 m² cap.

Correct a total phenytoin level for low albumin with the Sheiner-Tozer (Winter-Tozer) equation, the Anderson revision or the kidney-failure version, and compare it with the 10–20 mg/L range.

Calculate enoxaparin doses by indication: 1 mg/kg every 12 h or 1.5 mg/kg daily for treatment, 40 mg daily for prophylaxis, with the creatinine clearance below 30 mL/min adjustment and syringe volume.

Calculate the glucose infusion rate (GIR) in mg/kg/min from dextrose concentration, IV rate and weight, plus the rate for a target GIR, fluid in mL/kg/day and calories — for newborns and children.

Estimate a weight-based total daily insulin dose (0.3–0.6 U/kg), split 50/50 into basal and mealtime insulin, with a starting carb ratio (500 rule) and correction factor (1800 / 100 rule).

Calculate single-pool Kt/V with the Daugirdas second-generation formula, the urea reduction ratio (URR) and equilibrated Kt/V from pre- and post-dialysis urea, session time, ultrafiltration and weight.

Calculate the serum-ascites albumin gradient (SAAG) from serum and ascitic fluid albumin to tell portal-hypertensive from other ascites, and use ascitic total protein to narrow the likely cause.

Calculate your glucose ketone index (GKI) from blood glucose (mmol/L or mg/dL) and blood ketones (BHB, mmol/L), and see which ketosis range the ratio falls in.

Work out your daily Zone diet blocks from weight, body fat and activity level — with protein, carbohydrate and fat grams and a split across three meals and two snacks.

Find how much protein you need per meal to reach the leucine threshold (about 2.5–3 g) for muscle protein synthesis, by protein source — whey, milk, egg, meat, soy, pea, rice and more.

Calculate the APACHE II score from the worst values in the first 24 hours in ICU — 12 physiology variables, age and chronic health — with the estimated hospital mortality for non-operative and post-operative patients.

Calculate the Pneumonia Severity Index (PSI / PORT score) for community-acquired pneumonia — age, comorbidities, exam and lab findings — with risk class I–V, 30-day mortality and suggested site of care.

Calculate the Modified Early Warning Score (MEWS) from systolic blood pressure, heart rate, respiratory rate, temperature and AVPU level of consciousness, with the risk level and escalation threshold of 5.

Score acute pancreatitis severity with the modified Glasgow-Imrie criteria (PANCREAS): PaO₂, age, white cells, calcium, urea, LDH, albumin and glucose in the first 48 hours — 3 or more predicts severe disease.

Calculate Maddrey’s discriminant function for alcoholic hepatitis from prothrombin time, control PT and bilirubin (mg/dL or µmol/L) — a DF of 32 or more marks severe disease where corticosteroids may help.

Calculate the Lille score on day 7 of corticosteroids for severe alcoholic hepatitis from age, albumin, bilirubin on days 0 and 7, kidney function and prothrombin time — 0.45 or more means non-response.

Calculate the albumin-bilirubin (ALBI) score and grade 1, 2 or 3 for liver function in hepatocellular carcinoma and chronic liver disease, from serum albumin and bilirubin in US or SI units.

Calculate the Mayo score for ulcerative colitis activity — stool frequency, rectal bleeding, endoscopy findings and physician global assessment (0–12) — plus the partial Mayo score without endoscopy.

Calculate the Harvey-Bradshaw Index for Crohn’s disease from well-being, abdominal pain, liquid stools, abdominal mass and complications — with remission, mild, moderate or severe activity.

Calculate the BASDAI for ankylosing spondylitis and axial spondyloarthritis from six 0–10 questions on fatigue, spinal pain, joint swelling, tenderness and morning stiffness — 4 or more means active disease.

Calculate the ASDAS-CRP or ASDAS-ESR for axial spondyloarthritis from back pain, morning stiffness, patient global, peripheral joints and CRP or ESR, with the ASAS disease activity state.

Calculate the Revised Cardiac Risk Index (Lee index) before non-cardiac surgery — six risk factors, class I–IV and the estimated risk of major cardiac complications, original and updated (CCS 2017).

Calculate the Duke Treadmill Score from Bruce protocol exercise time, maximum ST deviation and the angina index — with low, moderate or high risk group, annual mortality and four-year survival.

Calculate the Khorana score for venous thromboembolism risk in ambulatory patients starting chemotherapy — cancer site, platelets, hemoglobin, white cells and BMI — with risk group and ASCO prophylaxis guidance.

Calculate the ROX index — SpO₂/FiO₂ divided by respiratory rate — to predict high-flow nasal cannula (HFNC) success or the need for intubation, with the 2, 6 and 12 hour thresholds.

Calculate the Westley croup score from level of consciousness, cyanosis, stridor, air entry and chest wall retractions — mild, moderate, severe croup or impending respiratory failure.

Calculate the Pediatric Appendicitis Score (Samuel score) for children with abdominal pain — 8 signs, symptoms and blood results, 0–10 points — with low, equivocal or high risk of appendicitis.

Score colonoscopy bowel preparation with the Boston Bowel Preparation Scale — right, transverse and left colon each 0–3 after washing — for a 0–9 total and adequate or inadequate preparation.

Score the Insomnia Severity Index (ISI) — 7 questions on falling asleep, staying asleep, early waking, satisfaction, noticeability, worry and daytime impact — 0 to 28 with insomnia severity.

Score the 17-item Hamilton Depression Rating Scale (HAM-D, HDRS) — mood, guilt, suicide, insomnia, activity, anxiety, somatic items and insight — 0 to 52 with depression severity.

Estimate daily protein, calories, sodium, potassium, phosphorus and fluid targets for chronic kidney disease stages 1–5, hemodialysis and peritoneal dialysis (KDOQI 2020).

Answer the 14 questions of the PREDIMED Mediterranean Diet Adherence Screener (MEDAS) to get your score out of 14, your adherence level and the items to improve.

Find your daily choline Adequate Intake (AI) and upper limit by age and sex, including pregnancy (450 mg) and breastfeeding (550 mg), and see how much of the target you already get.

Find your daily iodine RDA and upper limit in micrograms by age and sex, including pregnancy (220 mcg) and breastfeeding (290 mcg), and compare it with what you eat.

Find your daily zinc RDA and upper limit in milligrams by age and sex, including pregnancy and breastfeeding, and see how much of the target your current intake covers.

Convert International Units (IU) to mcg or mg and back for vitamin A (retinol and beta-carotene), vitamin E (natural and synthetic) and vitamin D, using the official NIH conversion factors.

Work out the % Daily Value of any nutrient from the amount on a food label and the servings you eat, using the current FDA Daily Values, and see if it is low (5% or less) or high (20% or more).

Check whether your baby or toddler has a fever from the temperature, the measuring method and age, and see when to manage at home, call the doctor or seek care now (AAP and NICE).

Get toddler and preschooler portion sizes by age: tablespoons of each food per meal (1 tbsp per year of age), meals and snacks a day, daily milk or dairy and the juice limit.

Score one period with the Pictorial Blood Loss Assessment Chart (PBAC): count lightly, moderately and fully soaked pads and tampons, clots and flooding to see if the score is 100 or more.

Find the daily dietary fluoride supplement dose for a child from age and the fluoride level of the drinking water, using the ADA/AAP schedule, in mg of fluoride and mg of sodium fluoride.

Work out how much protein a baby, child or teenager needs a day from age group and body weight, using the National Academies RDA in g/kg, with per-meal amounts and food examples.

Estimate left ventricular ejection fraction (LVEF) from the end-diastolic and end-systolic LV internal diameters with the Teichholz formula — volumes, stroke volume, fractional shortening and the ASE category.

Calculate cardiac output by the Fick principle (oxygen consumption, haemoglobin, arterial and mixed venous saturation) or as heart rate × stroke volume, with cardiac index, stroke volume index and BSA.

Calculate systemic vascular resistance (SVR) and pulmonary vascular resistance (PVR) from MAP, CVP, mean PA pressure, wedge pressure and cardiac output — in dyn·s·cm⁻⁵ and Wood units, with indices.

Calculate aortic valve area (AVA) with the continuity equation from LVOT diameter and the LVOT and aortic VTIs — with indexed AVA, dimensionless index, peak gradient and the ACC/AHA aortic stenosis grade.

Calculate the BODE index for COPD — Body mass index, airflow Obstruction (FEV₁ % predicted), Dyspnoea (mMRC) and Exercise capacity (6-minute walk) — score 0–10 with quartile and approximate 4-year survival.

Classify COPD with the GOLD report: confirm obstruction (FEV₁/FVC < 0.70), spirometric grade GOLD 1–4 from FEV₁ % predicted, and group A, B or E from symptoms (CAT or mMRC) and exacerbation history.

Add up the 8-item COPD Assessment Test (CAT) — cough, phlegm, chest tightness, breathlessness, activities, confidence, sleep and energy — total 0–40 with the impact level and the GOLD symptom cut-off of 10.

Check the Berlin definition of acute respiratory distress syndrome (ARDS): timing, bilateral opacities, origin of oedema and PaO₂/FiO₂ on PEEP ≥ 5 cmH₂O — with the mild, moderate or severe grade and reported mortality.

Calculate predicted (ideal) body weight from height and sex with the ARDSNet formula and the lung-protective tidal volume at 4–8 mL/kg — the 6 mL/kg target used in ARDS ventilation.

Stage acute kidney injury with the KDIGO 2012 criteria from baseline and current serum creatinine, urine output per kg per hour and renal replacement therapy — stage 1, 2 or 3 with the criterion that drives it.

Calculate the spherical equivalent (SE) of an eyeglass or contact lens prescription — sphere plus half the cylinder — with the myopia/hyperopia category and the plus/minus cylinder transposition.

Calculate intraocular lens (IOL) power for cataract surgery from axial length, keratometry and the lens A-constant with the SRK/T and SRK II formulas — for any target refraction, with predicted refraction per lens.

Calculate the Psoriasis Area and Severity Index (PASI) from redness, thickness, scaling and area in the head, arms, trunk and legs — score 0–72, severity, and PASI 50/75/90/100 response from a baseline score.

Calculate SCORAD for atopic dermatitis (eczema): extent of affected skin, intensity of six signs and itch and sleeplessness scores — total 0–103 and objective SCORAD 0–83 with mild, moderate or severe.

Score the Dermatology Life Quality Index (DLQI) — 10 questions on how a skin condition affected you over the last week — total 0–30 with the effect on quality of life from no effect to extremely large.

Calculate the maximum safe dose of a local anesthetic — lidocaine, bupivacaine, ropivacaine, mepivacaine or chloroprocaine, plain or with epinephrine — in mg and in mL of your solution strength.

Calculate the maximum allowable blood loss (ABL) before transfusion from weight, patient type (estimated blood volume), starting and lowest acceptable hematocrit — Gross formula, simple and logarithmic methods.

Convert between the ECOG (Zubrod/WHO) performance status 0–5 and the Karnofsky Performance Status (KPS) 0–100 used in oncology — with the description of each grade and the functional group.

Screen for frailty with the 5-item FRAIL scale — Fatigue, Resistance, Ambulation, Illnesses and Loss of weight — score 0–5: robust, pre-frail or frail.

Calculate the ICH score for spontaneous intracerebral hemorrhage — Glasgow Coma Scale, hematoma volume (ABC/2), intraventricular blood, infratentorial origin and age — score 0–6 with 30-day mortality.

Solve pharmacy alligation problems: how much of a higher and a lower strength (or a diluent at 0%) to mix to make a desired percentage, with parts, mixing ratio and a check grid.

Work out how much sodium chloride, boric acid or dextrose makes eye drops, nasal or injectable solutions isotonic using the E-value (NaCl equivalent) method, plus the White–Vincent volume.

Convert ratio strength (1:1,000, 1:10,000, 1:200,000) to percent strength, mg/mL, mcg/mL and ppm, or back again — for epinephrine, local anesthetics and pharmacy calculations.

Convert an insulin dose in units to mL for U-40, U-100, U-200, U-300 or U-500 insulin, see how many marks to draw, which syringe size fits and how many days a pen or vial lasts.

Calculate a pharmacokinetic loading dose from volume of distribution, body weight, target and current plasma concentration, bioavailability (F) and salt factor (S), in mg and mg/kg.

Calculate the maintenance dose that keeps an average steady-state concentration from clearance, target Css, dosing interval, bioavailability and salt factor — per dose, per day and as an infusion rate.

Calculate a drug’s elimination half-life and rate constant (ke) from two plasma levels and the time between them, plus how long until the level falls to a target and the time for ~97% elimination.

Estimate how long a drug takes to reach steady state from its half-life (about 5 half-lives), the number of doses needed, the accumulation factor and the peak-to-trough ratio for a dosing interval.

Calculate the apparent volume of distribution (Vd) of a drug from dose and initial plasma concentration, or from clearance and half-life, in litres and L/kg, with what the value means.

Calculate the area under the concentration–time curve (AUC₀–t and AUC₀–∞) by the linear or linear-up/log-down trapezoidal rule, with Cmax, Tmax, terminal half-life, CL/F and Vz/F.

Calculate absolute bioavailability (F, oral vs IV) or relative bioavailability (test vs reference product) from dose-normalised AUC values, with the 80–125% bioequivalence range as a guide.

Grade aneurysmal subarachnoid hemorrhage with the Hunt and Hess scale (I–V) from the clinical picture, including the one-grade upgrade for serious systemic disease or severe vasospasm.

Work out the WFNS grade for subarachnoid hemorrhage from the Glasgow Coma Scale and the presence of a motor deficit — grades I to V, with good-grade versus poor-grade SAH.

Grade the first CT after subarachnoid hemorrhage with the modified Fisher scale (0–4) from the thickness of subarachnoid blood and intraventricular hemorrhage, with the risk of symptomatic vasospasm.

Assign a modified Rankin Scale score (0–6) for disability after stroke with short structured yes/no questions on walking, bodily needs, daily affairs, previous activities and symptoms.

Score coma with the FOUR score — eye response, motor response, brainstem reflexes and respiration, 0–4 each for a total of 0–16 — a coma scale that works in intubated patients.

Score the 4AT rapid delirium screen — alertness, AMT4, months of the year backwards and acute change or fluctuating course — 0 to 12, with the cut-off of 4 or more for possible delirium.

Calculate cerebral perfusion pressure from mean arterial pressure (measured or from systolic and diastolic) and intracranial pressure in mmHg or cmH₂O, against the 60–70 mmHg brain trauma target.

Estimate intracerebral hemorrhage volume on CT with the ABC/2 method from the largest diameter, its perpendicular and the vertical depth or slice count, and check the 30 mL ICH score cut-off.

Calculate the physiological dead space fraction VD/VT with the Bohr–Enghoff equation from arterial and mixed expired CO₂, plus dead space volume, minute ventilation and alveolar ventilation.

Calculate static and dynamic respiratory system compliance on the ventilator from tidal volume, peak, plateau and PEEP pressures, plus driving pressure and the resistive pressure gap.

Calculate the rapid shallow breathing index (RSBI, f/VT) from respiratory rate and spontaneous tidal volume to predict ventilator weaning success, with the classic cut-off of 105.

Calculate left ventricular mass with the ASE-corrected cube formula from IVSd, LVIDd and PWd, then LV mass index, relative wall thickness and LV geometry (remodeling or hypertrophy).

Estimate GFR in children and teens with the 2009 bedside Schwartz equation (0.413 × height ÷ serum creatinine), in mg/dL or µmol/L, with the KDIGO GFR category.

Score the Berg Balance Scale — 14 balance tasks rated 0 to 4 for a total of 0–56 — with fall-risk bands (0–20, 21–40, 41–56) and the under-45 fall-risk cut-off.

Score the Short Physical Performance Battery: balance stands, 4-meter (or 3-meter) gait speed and five chair stands, 0–4 each for a total of 0–12, with the level of limitation.

Screen for sarcopenia with the SARC-F questionnaire — strength, assistance walking, rising from a chair, climbing stairs and falls, 0–2 each — where a score of 4 or more is positive.

Apply the Kocher criteria to a child with an irritable hip — non-weight-bearing, fever over 38.5 °C, ESR over 40 mm/h and WBC over 12,000 — and see the predicted probability of septic arthritis.

Score the Hendrich II Fall Risk Model for hospital inpatients — confusion, depression, altered elimination, dizziness, male sex, antiepileptics, benzodiazepines and the Get-Up-and-Go test — where 5 or more is high risk.

Calculate the LRINEC score for necrotizing soft tissue infection from CRP, white cells, hemoglobin, sodium, creatinine and glucose, in conventional or SI units, with low, intermediate or high risk.

Classify a pleural effusion as exudate or transudate with Light’s criteria from pleural and serum protein, pleural and serum LDH and the lab upper limit of normal for serum LDH.

Enter your baby’s sex, age in months and head circumference to get the WHO percentile, z-score, median and normal range for babies and children from birth to 5 years.

Find your baby’s or toddler’s length or height percentile and z-score from the WHO growth standards, from birth to 5 years, with the median, normal range and stunting check.

Check a child’s hemoglobin result against the WHO 2024 anemia cutoffs for 6 months to 14 years, with mild, moderate and severe bands and the adjustment for living at high altitude.

Classify acute malnutrition in children aged 6–59 months from mid-upper arm circumference (MUAC) and edema using the WHO/UNICEF cutoffs: severe (SAM), moderate (MAM) or normal.

See the normal heart rate, breathing rate and blood pressure for a newborn, baby, toddler, child or teen (PALS ranges), and check whether your child’s measurements are in range.

Work out how much oral rehydration solution (ORS) a child with diarrhea needs by weight and dehydration level, following WHO Plans A, B and C, plus the zinc dose.

Calculate the cranial vault asymmetry index (CVAI) and cephalic index from your baby’s head measurements to grade flat head syndrome (plagiocephaly and brachycephaly) severity.

Check a child’s or teen’s blood pressure against the AAP 2017 screening values by age and sex, and see the elevated and stage 1 or 2 hypertension categories from age 13.

Estimate a newborn’s bilirubin range from how far down the body the yellow color has spread (Kramer zones 1–5) and see when a skin or blood bilirubin test is needed.

Calculate your basal metabolic rate with the Harris-Benedict equation (original 1919 or revised 1984) and your daily calorie needs for five activity levels.

Estimate resting metabolic rate with the Cunningham equation (500 + 22 × lean body mass), the formula preferred for athletes, plus daily calories by activity level.

Estimate basal metabolic rate with the Schofield (WHO/FAO/UNU 1985) equations for children and adults by age band and sex, plus daily energy needs from your PAL.

Calculate your estimated energy requirement (EER) with the Institute of Medicine DRI equations for adults and children aged 3+, by age, sex, weight, height and activity.

Work out your physical activity level (PAL) from the hours you spend sleeping, sitting, standing, walking and exercising, using FAO/WHO/UNU activity ratios, plus total daily calories.

Calculate the conicity index (C index) from waist, weight and height to assess abdominal fat distribution, with sex-specific cut-offs for cardiovascular risk.

Calculate your fat mass index (FMI) from weight, height and body fat percentage and see the Kelly (2009) category, from fat deficit to obesity class III, plus your FFMI.

Calculate mid-upper arm muscle circumference, arm muscle area (corrected for bone, Heymsfield), arm fat area and arm fat index from arm circumference and triceps skinfold.

Estimate standing height from knee height with the Chumlea (1985) equations for older adults, for people who cannot stand, plus an estimated BMI from your weight.

Calculate an adjusted BMI after limb amputation: estimate the weight with the missing limb using Osterkamp body-segment percentages, then the corrected BMI and category.

Calculate the potential renal acid load (PRAL) of your daily diet or a food from protein, phosphorus, potassium, magnesium and calcium (Remer & Manz), plus a NEAP estimate.

Plan a classic ketogenic diet by ratio (4:1, 3:1, 2:1 or 1:1): turn daily calories and protein into grams of fat, protein and net carbs using dietary units.

Rate your 30-second chair stand test score against Senior Fitness Test norms for your age and sex (60–94), with the CDC STEADI below-average fall-risk flag.

Interpret a Timed Up and Go (TUG) test time: mobility level (Podsiadlo & Richardson), the 12-second CDC STEADI fall-risk cut-off and the average time for your age group.