Everyday Calculators

Estimate what a road trip costs in gas, diesel or electricity — one way or round trip, extra stops, tolls and parking, split per person — with MPG, L/100 km, km/L or kWh figures.

Work out your car’s real MPG from miles driven (or odometer readings) and gallons filled — or average a whole fill-up log — in MPG, L/100 km, km/L and UK MPG, with cost per mile, yearly fuel cost and CO₂.

Turn an appliance’s wattage and daily hours into its real cost per day, month and year.

Pick an appliance and see what it costs to run per month and per year at your electricity rate.

How many gallons of paint and primer a room needs from its size, doors, windows, coats, ceiling, surface texture and the coverage on the can, with the can mix to buy and the cost.

Mulch for beds, tree rings and borders: cubic yards, cubic feet and bags (2 or 3 cu ft, liters) for rectangles, circles, triangles, rings or a list of beds, with weight by mulch type, bulk vs bag cost and delivery.

Compare two package sizes by unit price and see which is the better deal — and by how much.

Split rent between roommates or partners by income, evenly, by bedroom size (with shared space and couples), or a blend of income and even — plus room premiums, shared bills and each person’s rent-to-income ratio.

What your drive to work really costs per month and per year in gas and parking.

Find the right couch-to-screen distance for your TV size, or the right TV size for your seat, using the THX and SMPTE viewing-angle guidelines and the distance at which 4K, 8K and 1080p detail is visible. Also shows the viewing angle from your seat and how high to mount the screen.

How long a text takes to read from its word count and your reading speed.

What your coffee habit costs per year and decade — and what that money could grow to invested.

Work out commission earned from a sale amount and rate — plus total pay when you add a base salary.

Add up streaming, music, app, software, gym and box subscriptions billed weekly, monthly, quarterly or yearly. See the monthly, yearly and daily total, a ranked list of what to cancel, the cost over several years with price rises, and what the same money could grow to invested.

Turn your daily screen hours into weekly, monthly and yearly totals — and the share of your waking day.

How much carpet a room needs in square feet and square yards, with a waste allowance and total cost.

How much grass seed your lawn needs: rectangles, circles, triangles, a known area or a list of areas, seeding rates for 11 grass types (new lawn or overseeding) or the rate on your bag, pure-live-seed adjustment, bags to buy and cost.

Plan your holiday spending — gifts, food, travel and decorations — with a total and a per-category breakdown.

Measure a firewood stack, round stack or loose load and see how much of a full cord it is: cords, face cords, cubic feet and steres (m³), with weight and heat by wood species, price per cord, and the stack length needed for any amount.

Estimate your water bill from metered use in gallons, CCF or m³, or from a household usage estimate, with flat or tiered rates, fixed service charges, sewer charges, other fees and taxes. Shows monthly and yearly totals, a tier breakdown and the bill at other usage levels.

Estimate heating savings from turning the thermostat down, using the ~1% per degree per 8 hours rule of thumb.

How many rolls of wallpaper a room needs from wall size, roll coverage, doors, windows and waste.

Estimate total travel time for a flight from the distance, cruising speed and the taxi-and-buffer time airports add on top of pure air time.

Find what a purchase really costs each time you use it — the honest way to judge whether an expensive item is worth it.

Convert shoe sizes between US, UK, EU and centimetres for men and women — a close cross-reference for online shopping across regions.

Convert ring sizes between US numbers, inside diameter, circumference and UK letters — from a measurement or a known size.

Convert clothing sizes between US, UK, EU and S/M/L for women and men — a close cross-reference for international online shopping.

Find how much propane is in a tank — from a 1 lb canister to a 1,000-gallon tank — and how long it will last: gallons, pounds and BTU left, burn rate, run time at full or partial burner setting, days at your daily use, and a size-by-size comparison.

Compare two pizzas by price per square inch and see which size is actually the better deal.

What one shower really costs in water and heating — per shower, per month and per year.

The real cost of doing laundry per load, per week and per year — water, electricity and detergent.

Compare mowing your own lawn against hiring a service — seasonal cost each way, and what you save by doing it yourself.

How much a more fuel-efficient car saves you in gas — per year, in gallons, and over five years.

Turn a small recurring spend into its yearly cost, its cost over years, and what it could grow to invested.

Budget a dinner party course by course: appetizers, main, sides, dessert and drinks per person, wine bottles from glasses per guest, hosts at the table, decor and hired help, a buffer you choose, a budget check, a comparison with eating out and the total for other guest counts.

Estimate what a move will cost and compare DIY truck rental, truck plus hired loaders, a portable container and professional movers — local or long-distance — with packing, supplies, insurance, tips, travel and storage.

The true cost of a self-storage unit over your rental term — rent, fees, insurance and cost per square foot.

What your parking really costs a day, a month and a year — hourly with first-hour price, billing blocks and a daily cap, an all-day rate or a monthly pass — and which option is cheapest, with break-even days, parking tax, employer subsidy and pre-tax commuter savings.

Plan a gift budget across your list — gifts, wrapping and shipping — with a clear per-person all-in cost.

Estimate your household’s daily and monthly water use — showers, toilets, laundry and dishes — and its cost.

Add a tip to a restaurant bill and split the total evenly across your group — see the per-person share down to the cent.

Estimate the fuel cost of a road trip from the distance, your vehicle’s fuel economy and the price at the pump.

Work out what a single appliance costs to run — per day, per month and per year — from its wattage, hours of use and your electricity rate.

Compare up to four package sizes by unit price — even when one is in ounces and another in pounds, grams or litres — with multipacks and coupons, and see which is the better buy and how much you save.

Find the final price after a percentage discount, how much you save, and the price with sales tax added.

Add sales tax to a purchase to get the total, or split a tax-inclusive total back into the pre-tax price and the tax.

Turn distance and fuel used into MPG and L/100 km at once, so you can read your car’s efficiency either way.

Estimate roasting time from the weight of your joint and the minutes-per-pound rule for your chosen meat and doneness.

Find the exact duration between a start and end time, including shifts that cross midnight, in hours and minutes.

Scale a pour-over or drip brew to any cup size — get the grams of coffee and water for your chosen strength ratio.

Pizza dough by baker’s percentages: flour, water, salt, yeast (instant, active dry, fresh or sourdough starter), oil and sugar for any number of balls, sized by ball weight or by pizza diameter or pan with a thickness factor, plus poolish or biga splits and bowl-residue allowance.

Estimate how many cans of paint a wall area needs across your chosen number of coats — and the total cost.

Estimate what it costs to heat your hot water each day, month and year from your usage, incoming water temperature and energy price.

See how much a rooftop solar system produces, what it saves on your electric bill, and how many years it takes to pay for itself.

Find out how little it really costs to charge your phone, tablet or laptop — per charge and per year — from battery size and your electricity rate.

Add up what your always-on gadgets cost while idle — the vampire power drawn by TVs, chargers and set-top boxes waiting on standby.

Work out how much fertilizer your lawn needs from its size and the target nitrogen rate — bags to buy and what it costs.

Compare the material cost of wallpapering a room against painting it, from your wall area, coverage and prices — with the cheaper option flagged.

Estimate how many cords of firewood a heating season needs and what it costs, by wood species, stove efficiency and your seasonal heat demand.

Estimate how much propane your appliances burn and what it costs per day, month, season or year — from each appliance’s BTU rating, run time and average firing rate, with prices per gallon, liter, pound or kilogram, tank refill timing and an electric heating comparison.

Turn household water use — a daily total, a per-person figure or an activity-by-activity estimate — into a daily, monthly and yearly cost with water and sewer rates, fixed charges, tax and savings scenarios.

Estimate how long a battery lasts under a given load, from its mAh capacity, voltage and the current your device draws — with real-world derating.

Find the right cooling capacity for a room in BTU and tons, adjusted for ceiling height, sun exposure, occupancy and kitchen heat.

Add up hours worked from clock-in and clock-out times, subtract your break, and get total hours and gross pay — overnight shifts included.

Estimate the total cost to carpet a room: carpet by the square yard with a waste allowance or a real roll layout, pad and installation, stairs, old-carpet removal, tax and fees.

Work out how many boxes of laminate or vinyl plank flooring a room needs and the total material cost, including waste and underlayment.

Estimate what a move will cost — a local hourly-crew move or a long-distance move priced by shipment weight and distance — from your home size.

Estimate the storage unit size you need from the boxes, furniture and appliances you plan to store — and see the recommended unit.

Set a realistic monthly grocery budget for your household using USDA-style food-plan levels, broken down per person, per week and per day.

Find your true cost per meal when batch-cooking, and see how much you save each week versus buying the same meals out.

Estimate how much your dog or cat should eat, how long a bag of dry food or a case of cans lasts, and what feeding really costs per day, month, year and over the years ahead, from your pet’s weight, life stage and the food’s calories. Handles dry, wet and mixed feeding, treats, several pets and auto-ship discounts.

Count the wallpaper rolls a room needs by matching strips to the roll length, allowing for ceiling height and the pattern repeat.

Calculate the fabric yardage for curtains from the rod or window width, finished drop, heading style or fullness, single panel or pair, bolt width, hems, returns, overlap and pattern repeat — with half widths, railroading, lining, several windows and the cost.

Work out how many gallons or liters your pool holds — rectangular, round, oval, kidney or L-shaped, with a sloped floor — plus fill time, fill cost, pump flow and water per inch of level.

Estimate how much liquid chlorine to raise free chlorine, and how much acid or soda ash to correct pH, for your pool’s exact gallons.

Turn a weekly watering target into per-session sprinkler run times, and see the gallons your lawn uses each week.

Turn any appliance’s wattage and daily use into the kilowatt-hours it burns and what it adds to your monthly electric bill.

See how much a switch from incandescent to LED bulbs saves in electricity each year across all the bulbs in your home.

Estimate what turning your thermostat back while you sleep or are out saves on a year of heating or cooling, using the DOE 1%-per-degree rule.

Add up the electricity, water and detergent behind one load of laundry — and what your weekly wash habit costs over a year.

Compare the water and energy cost of running the dishwasher against washing the same dishes by hand, per load and per year.

Compare the water and water-heating cost of a shower against a full bath, and see which is cheaper for your habits.

Estimate the monthly and per-mile cost of charging your electric car at home from your driving distance, efficiency and electric rate.

Work out how long a portable generator runs on a tank, how much fuel a day of backup power needs, and what it costs to run.

Work out what an electric space heater costs per hour, day, week, month and heating season from its wattage, hours of use and your electricity rate — with several heaters, thermostat cycling and a cost comparison against a gas furnace or heat pump.

Compare what a ceiling fan costs to run against an air conditioner, and see the monthly saving from reaching for the fan first.

Turn a refrigerator’s yearly kilowatt-hours from its EnergyGuide label into what it costs you to run per year, month and day.

Divide your phone bill by the data you actually use to get a true cost per gigabyte — the fair way to compare plans.

Work out exactly how much soil to buy for a raised garden bed — cubic feet, cubic yards and the number of bags for any bed size.

How many plants fit in a garden bed at a given spacing: square, triangular (offset) or row layouts, rectangular, round or any-size beds, edge setback, crop spacing presets, a row-by-row planting plan, spares and cost.

Count back from your last frost date to find when to start seeds indoors and when to transplant them outside.

Convert a target nitrogen rate into pounds of fertilizer to apply — for any N-P-K analysis and any area.

Balance your compost pile: split a bin into browns and greens, estimate the real carbon-to-nitrogen (C:N) ratio and moisture of a mix of up to four materials, or find how much browns to add to the greens you have to reach 30:1.

Turn a bed area and mulch depth into cubic feet, cubic yards and the exact number of bags to buy.

Calculate how many pounds of grass seed you need for a new lawn or overseeding, based on grass type and lawn size.

Convert inches of water into gallons for your lawn, and estimate how long to run a hose or sprinkler at a given flow rate.

Size a greenhouse heater in BTUs from its dimensions, covering type and the temperature you need to hold on a cold night.

Estimate how many plants fit in your garden rows and the total harvest you can expect from them.

Calculate total drip system flow and how many gallons your emitters deliver per run, per day and per week.

Find how much potting mix fills your containers — in quarts, cubic feet and bags — for round or rectangular pots.

Split a total gift budget across everyone on your list and see the per-person amount, with an optional priority weighting for close family.

Work out how many bottles of wine, beers and soft drinks to buy for a party from your guest count, hours and how heavily they drink.

Estimate how many pounds and bags of ice you need for a party, covering ice in drinks plus chilling cans and bottles in coolers.

Find out how much ground coffee and water to brew for a group, and how many large urns or pots it takes to serve everyone.

Turn your invite list into a realistic catering headcount using typical RSVP acceptance rates, plus per-head appetizer and cake counts.

Plan a potluck so nobody goes hungry: how many main, side, salad and dessert dishes to ask guests to bring for your headcount.

Plan a road trip’s real door-to-door time: driving time, rest and meal stops, traffic buffer, fuel-range stops, overnight stays, a day-by-day itinerary and your arrival date and time.

Check your bag against the airline weight allowance, see how much room is left or how far over you are, and estimate the overweight fee.

Split a shared tip jar fairly among staff by hours worked, so someone who worked a full shift earns more than a half-shift coworker.

Turn a weekly chore list into a points system and, if you like, convert earned points into a fair allowance for each child.

Find a weekly, biweekly or monthly allowance for your child by age: the “$1 per year of age” rule, typical 2025 amounts by age, or your own amount, split into spend, save and give, with a year-by-year plan to age 18, savings with a parent match and interest, and a total for siblings.

Build a realistic daily screen-time budget by subtracting sleep, school or work, meals and activities from the 24-hour day.

Convert a foot length into US men, US women, UK and EU shoe sizes using the Brannock and Paris-point formulas — no guesswork chart.

Turn a finger circumference or diameter in millimetres into US, ISO/EU and UK ring sizes — measure once, convert everywhere.

Convert a women’s clothing size between US, UK, EU, French, Italian and Australian scales in one step.

Convert your head circumference into a US fitted hat size, UK size, EU/centimetre size and an S–XL band.

Turn the circumference around your palm into a numeric glove size and an XS–XXL letter size.

Work out your band and cup size from underbust and bust measurements, with the EU band equivalent.

Check how far a checked bag is over the airline limit and estimate the overweight fee before you get to the counter.

Find the dimensional (volumetric) weight of a shipping box and the billable weight carriers actually charge you for.

Estimate postage from a base rate plus a per-unit charge for every extra ounce or gram of weight.

Work out what a propane refill costs: the gallons or pounds to add from a gauge reading or a scale weight, the 80% fill limit, price per gallon, liter, pound or kilogram, delivery fees, minimums and tax, a budget check, and how a refill compares with a tank exchange.

Compare the heat energy of a cord of firewood by species and see its equivalent in heating oil and natural gas.

Work out how much rock salt or ice melt to spread on a driveway or walkway, and how many bags to buy.

Work out how much wallpaper paste you need from the wall area and the spread rate, then how many packets to buy and what they cost.

Turn a room’s size and its fan or vent airflow into air changes per hour (ACH), and find the CFM you need to hit a target ventilation rate.

Estimate the pints-per-day capacity your dehumidifier needs from the room’s square footage and how damp it feels, then match it to a standard unit size.

See what it costs to run a humidifier: turn its wattage, daily hours and your electricity rate into a cost per day, month and season.

Size a window air conditioner in BTUs from your room’s area, sun exposure and occupancy using the EPA’s 20-BTU-per-square-foot rule.

Calculate how much paint a ceiling needs from its dimensions, the number of coats and the coverage on the tin — plus gallons to buy and the cost.

Find how many gallons of deck stain you need from the deck size, coats and the coverage rate, and estimate the total cost.

Estimate the gallons of sealer a concrete driveway needs from its size, coats and coverage rate, with a cost estimate for the job.

Estimate how long it takes to mow your lawn from its area, your mower’s cutting width and your walking speed, allowing for overlap.

Estimate how many lawn-and-leaf bags you’ll fill from your yard size, the depth of fallen leaves and how much they compress when bagged.

Estimate how often to clean your gutters based on nearby trees, and what that costs per year and over several years.

Estimate how long a pressure-washing job takes from the area, how dirty the surface is and the number of passes.

See what a piece of clothing really costs each time you wear it — the number that separates a bargain from a closet full of expensive mistakes.

Work out the true cost per mile of a distance hobby like cycling, running or road-tripping, gear and upkeep included.

Find how many visits it takes for a gym membership to beat pay-per-class pricing — and what each visit really costs you.

Compare a stack of streaming subscriptions against a cable bill and see whether cutting the cord actually saves money.

Compare a meal-kit subscription against cooking the same dinners from groceries — per serving and per year.

Compare unit prices between a bulk pack and a regular size and see whether buying big actually saves money.

Stack a store discount, a coupon code and cashback in the right order and see your true final price and total savings.

Compare a flat cashback card against a points card by converting points to their real cash value on your actual spending.

Decide whether an extended warranty is worth buying by comparing its price to the expected cost of repairs.

Decide whether to rent a tool or buy it, comparing rental fees against ownership after resale and storage.

Compare brewing coffee at home against buying it out and see how much your daily café habit really costs each year.

Turn a new phone into its true monthly cost after trade-in, resale, accessories, sales tax, protection plan and financing interest, see how the cost per month falls the longer you keep it, and compare upgrading now with keeping your current phone a while longer.

Build a realistic daily travel budget from lodging, food, activities, local transport and a buffer — then see the total for the whole trip.

Work out what foreign currency you really get after a rate markup, a percentage commission and a fixed fee. Enter the markup or the rate you were quoted, find the hidden margin, the true cost in your money and as a percentage, the effective rate, or how much you must exchange to receive a set amount.

Estimate how many days your body needs to adjust after crossing time zones, using the rule that eastward travel is harder than westward.

Compare the total out-of-pocket cost of driving versus flying for your whole group, including fuel, tolls, airfare and airport parking.

Split a hotel stay fairly between guests, including taxes, resort fees and nights — so everyone pays their exact share.

Add up the full cost of a road trip — fuel, food, lodging and extras — and split it per traveler for a true door-to-door budget.

Estimate the packed weight of your suitcase from what you plan to bring, and see how much of the airline allowance you have left.

Estimate a travel insurance premium as a share of your trip cost, adjusted for traveler age and the level of coverage you choose.

See the customary restaurant tip for the country you are visiting and the amount to add to your bill — from generous US norms to no-tip Japan.

Check whether your connection is a safe layover by comparing the time you have against the minimum needed for your type of connection.

Work out the cents-per-point value of a credit-card or airline redemption and see whether it beats cashing the points in.

Project how much paid time off you will have accrued by your trip, and check whether it covers the days you plan to take.

Turn a label dilution ratio like 1:32 and your bottle size into the exact concentrate and water to pour — no more guessing at the cap line.

How much household bleach to add to water to disinfect, sanitize food-contact surfaces, clean up norovirus, flood damage or mold, or treat emergency drinking water — scaled to your bleach strength (5.25–12.5%), with the mixing ratio, ppm, contact time and a recipe for every container size.

How much liquid laundry detergent to use per load, adjusted for load size, soil level and 2× or 4× concentrated HE formulas.

How long a dishwasher rinse-aid reservoir lasts and what a year of refills costs, from your dispenser setting and how often you run the machine.

Mix the right carpet-cleaner concentrate and water for your machine tank, and see how many refills a room of a given size needs.

How much floor-cleaner concentrate to add to your mop bucket, and how many buckets a floor of a given size takes.

Mix a homemade vinegar-and-water cleaner to any ratio and bottle size, with the essential-oil drops to mask the smell.

How much cal-hypo, dichlor or liquid chlorine to shock your pool, from its volume and the free-chlorine rise you need.

How much dichlor chlorine granules to add to a hot tub or spa to reach a target free-chlorine level, in teaspoons and grams.

Turn a label mix rate (fluid ounces per gallon) and your sprayer size into the exact concentrate to add, plus how many tanks cover your yard.

Mix liquid or water-soluble fertilizer to the label dose per gallon for your watering can, and total it across a season of feedings.

Mix pressure-washer detergent to a dilution ratio like 1:10 for your tank, accounting for the downstream injector draw.

Find the right area-rug size for a room by leaving an even border of bare floor around it, then snap to the nearest standard rug size.

Work out curtain rod width, finished panel length and how many ready-made panels you need for a properly full, correctly hung window treatment.

Find the ideal TV screen size for how far away you sit, using the SMPTE and THX field-of-view guidelines for 4K and 1080p sets.

Find exactly where to put the hook so your artwork lands at gallery eye level (the 57–60 inch center rule), accounting for the wire drop.

Lay out a row of frames evenly: get the total group width, the even gap between frames and the side margins so the arrangement sits centered on the wall.

Estimate how many books a bookcase holds from the shelf width, number of shelves and the average thickness of your books.

Add up how much hanging rod your wardrobe needs from the number of shirts, pants and dresses or suits you hang.

Check whether a kitchen island leaves enough walkway on every side, against the NKBA minimum of 42 inches (48 inches for two cooks).

Size a dining table for the number of guests using the 24-inch-per-place-setting rule, for both rectangular and round tables.

Pick the right ceiling-fan blade span for your room size, and get the downrod length that hangs the blades at the ideal height.

Find the floor area and perimeter of an L-shaped room by subtracting the missing corner from the full bounding rectangle.

Get the true paintable wall area by subtracting doors and windows from the gross wall area — the number that drives paint and wallpaper quantities.

Estimate how many small, medium and large moving boxes you need from your home size and how much stuff you own.

Compare two self-storage units side by side on monthly rent, total cost over your rental period and cost per square foot.

Price a garage-sale item fast using a simple percentage of its original retail price, adjusted for condition.

Estimate what a used item will actually net you after resale-platform fees, from its expected sale price.

Turn a big decluttering goal into a daily pace: how many items to remove per day to finish by your target date.

See how much you could save each year by shopping less often, cutting the impulse spending that comes with every extra trip.

Find out how many days your food stockpile will last a household, and how many servings you need for a target number of days.

Calculate how much emergency water to store for your household and pets using the standard one-gallon-per-person-per-day rule.

Size a backup generator for a power outage by adding up the running and starting watts of the appliances you must keep on.

Estimate how many hours a candle will burn from its wax weight, and how long it lasts at your typical session length.

Find out how many hours of grilling you get from a propane tank based on its size and your grill’s BTU output.

Work out how many batteries a set of devices needs — for an initial load-out and for a year of replacements.

How many cups of kibble your dog should eat per day, worked from its weight, activity level and the food's calorie density.

How much to feed your cat each day — daily calories from its weight, then the number of cans or cups for your food's energy density.

How many meals a day and how many calories your puppy needs, from its age in months and current weight.

Your dog’s daily calorie requirement from its weight and life stage — resting energy plus the right activity multiplier.

Convert your cat’s age into human-equivalent years with the veterinary rule: 15 for the first year, 24 by two, then four a year.

How many gallons to swap in a water change — from your tank size and the percentage you change each time.

The right crate length and height for your dog — measured length and height plus the standard few inches of clearance.

How many litter boxes your household needs — the vet "one per cat plus one" rule, spread across your home’s levels.

Double-check a vet-prescribed dose: turn a mg/kg, mg/lb or mcg/kg rate into milligrams, millilitres of liquid or tablets (rounded to halves or quarters), daily and course totals — or check what mg/kg a prescribed amount works out to. A dosing check, not a prescription.

Roughly how many calories your dog burns on a walk, from its weight and the distance you cover together.

How much feed your flock eats per day, week and month — and how long a bag of feed will last.

How much hay and feed a horse needs per day — the standard percentage of body weight, split into forage and concentrate.

See how paint sheen changes real coverage — flat stretches further, gloss covers less — and get the gallons and cost for your wall.

Decide how many primer coats a surface really needs and how many gallons to buy — bare drywall, stains, or a drastic color change.

Work out how many wallpaper rolls a patterned print really needs once you add the pattern-repeat waste from matching each drop.

Turn your window opening into the exact blind or shade size to order — inside mount with clearance deductions, or outside mount with overlap.

Estimate the wall tile and edge trim for a three-wall shower surround — tile count with waste, plus the bullnose or trim length for exposed edges.

Figure out the tile and number of boxes for a kitchen backsplash from the counter run and backsplash height, with a waste allowance built in.

Plan a closet organizer: shelf boards, support brackets and hanging-rod length from your closet width and the number of shelves.

How many epoxy floor kits your garage needs for one or two coats, from the slab dimensions and each kit’s coverage rating.

Estimate the sealer for an asphalt driveway — gallons and 5-gallon pails for one or more coats from the driveway size and coverage rate.

Count the screws or hidden fasteners for a deck from its size, board width and joist spacing — plus how many boxes to buy.

Count the pre-built fence panels and posts for a run of fencing, allowing for gate openings, from your total fence length.

Count the cap blocks and tubes of construction adhesive to finish the top course of a retaining wall from its total length.

Work out how many guest tables you need for a wedding or event from your headcount and the seats per table.

Estimate how many chairs to rent for a wedding or event, including ceremony and reception seating plus spares.

Find the tent square footage and a suggested tent size for your guest count based on how the event is seated.

Size a dance floor for your event: how many square feet and which panel layout fit the share of guests dancing at once.

Estimate how many parking spaces an event needs from guest count, car occupancy, the share who drive and the peak crowd. Includes staff, a safety buffer, ADA accessible spaces, lot or field area, a check of the space you have and the shuttle buses for a remote lot.

Estimate how many portable restrooms to rent for an event based on guest count, event length and alcohol service.

Estimate how many servers, bartenders and kitchen staff your event needs based on guest count and service style.

Count every linen for a wedding or event: tablecloths with the right size for round and banquet tables at floor, half or lap drop, napkins with spares, runners, overlays, chair covers, sashes and cocktail-table cloths, with a full rental order list and cost.

Plan your event centerpiece budget: total cost and cost per guest from the number of tables and price per centerpiece.

Split the cost of an event photo booth across contributors and see the cost per guest and per hour.

Compare the total cost of hiring a DJ versus a live band for your event, including add-ons and per-guest cost.

Estimate the per-guest and total cost of an open bar from drinks per guest, event length and average drink price.

Find how many light strands you need for your roofline and trees, plus what the buy cost and holiday electricity bill will be.

Find the tallest tree that fits your room with topper clearance, plus how many lights and ornaments it will take to fill it.

Turn how many dozen cookies you want to bake into a shopping list of flour, sugar, butter, eggs and chocolate chips.

Enter your turkey weight and get roast time, safe fridge-thaw days and a countdown timeline so everything lands on the table at once.

Plan an egg hunt: how many plastic eggs to fill, packs to buy, candy to stuff them with and what it all costs.

Estimate how many bags of candy to buy for trick-or-treaters from your expected turnout and pieces per visitor.

Estimate how long carving your jack-o-lanterns will take from the number of pumpkins, design difficulty and how many people are helping.

Split a backyard fireworks budget into aerial cakes, a finale and ground effects, and see how many cakes you can afford.

Enter your last spring frost date and a crop to get when to start seeds indoors and when it is safe to plant outside.

Estimate the hours a deep spring clean will take for your home and turn it into a realistic day-by-day schedule.

Estimate the calories you burn shoveling snow from your body weight, how long you shovel and how heavy the work is.

Add up the postage and card cost for your holiday mailing, including any cards going overseas.

Work backwards from your move date to see when to book movers, start packing and finish — a countdown of the key moving milestones.

Compare the true monthly cost of renting an apartment against owning a house — mortgage, utilities, maintenance and fees, side by side.

Split rent and shared bills fairly between roommates by income instead of down the middle — so the share matches what each person can afford.

Add up the deposits and connection fees to turn on electricity, gas, water, internet and more at a new home — the hidden cost of moving in.

Add up everything a landlord asks for before you get the keys — security deposit, first and last month, and fees — so move-in day holds no surprises.

Budget for home upkeep with the 1% rule — set aside 1% of your home’s value each year, adjusted for the home’s age, and see the monthly savings target.

See whether your HOA dues are worth it by pricing the services they replace — and how much the monthly fee adds to what you can afford to borrow.

Decide if a home warranty pays off by comparing the annual premium plus service fees against the repairs you actually expect in a year.

Find the payback period and lifetime savings of an efficiency upgrade — insulation, windows, heat pump — from its cost and the energy it saves.

Estimate the water and money you’ll save by switching to low-flow showerheads, faucets and toilets — plus how fast the fixtures pay for themselves.

Estimate what a smart thermostat saves on heating and cooling from your energy bill, and how quickly the device pays for itself.

Compare an ENERGY STAR appliance with a standard model: yearly electricity and water cost, payback on the price premium after rebates, lifetime and present-value savings with rising power prices, life-cycle cost and CO₂ avoided. Uses the kWh from the EnergyGuide label or a percentage saving.

Estimate how much fabric to buy for a garment by nesting the pattern pieces across the bolt width — with a waste allowance for matching and hems.

Turn your chest, waist and height into a jacket size and length (Short, Regular or Long), the matching trouser waist and the European equivalent.

Find the right necktie length for your height and knot — standard, extra-long or boy's — so the tip lands at your belt line.

Convert your pant size or actual waist measurement into the correct belt size — belts are sized to the middle hole, not your waist.

Turn a clothing budget into a cost-per-wear target: see the average price you can spend per item and how many times you must wear each piece to justify it.

Count how many unique outfits a capsule wardrobe creates from your tops, bottoms and dresses — and how many days you can go without repeating.

Estimate the melt value of gold jewelry from its weight, karat purity and the current gold spot price per troy ounce.

Find your watch strap length and lug width from your wrist and case size, with a comfort allowance so the watch sits snug but not tight.

Estimate how long it will take to grow your hair to a target length, accounting for the average growth rate and any regular trims.

Plan how many bottles of nail polish a salon needs from client volume, product used per service and a wastage allowance.

Estimate how long a fragrance lasts on skin from its concentration type, the number of sprays and your skin type.

Identify your skin undertone — cool, warm or neutral — from the vein, jewelry and sun-reaction tests, and get the matching foundation shade code.

Estimate how many diapers your baby needs per day and the running cost — per week, per month and until potty training.

Work out how much infant formula your baby drinks and what it costs per day, per month and per can.

See how much total sleep, night sleep, day sleep and how many naps a baby or toddler needs at a given age.

Estimate how much milk a baby needs by age — ounces or mL per feeding, feedings a day, total daily milk and hours between feeds — for formula or expressed breast milk, with the AAP weight rule (2.5 oz per pound, up to 32 oz), a sample feeding schedule and a by-age chart.

Find the ideal awake time between naps for your baby by age — the wake window that prevents overtiredness.

Estimate solid-food portions and meals per day for a baby starting solids, by age — in tablespoons and jars.

Compare daycare, nanny and family care side by side — monthly and yearly cost, and the cost per working hour.

Compare saving for a child in a tax-advantaged 529 plan versus an ordinary taxable savings account over time.

Add up the real yearly cost of a child’s activities — fees, gear, travel and extras — and see it per month and per session.

Find when a child car seat expires from its manufacture date, and how long it is still safe to use.

See whether a stroller-and-car-seat travel system is cheaper than buying the pieces separately — and the bundle saving.

Estimate a toddler’s US shoe size from their age, plus the typical foot length and EU size — a starting point before measuring.

Find exactly how many pavers you need for a patio from its size, your paver dimensions and a cutting-waste allowance.

Size a fire pit and its gravel base — pad volume, weight and the safe clearance you need around the flames.

Plan the counter run for an outdoor kitchen by adding up your grill, appliances, prep zone and the landing space code recommends.

Estimate the posts, beams and rafters for a pergola from its footprint, height and rafter spacing.

Count the posts, sections and rails for a garden fence from its length, your post spacing and the number of gates.

Work out the boards, courses and corner posts for a raised garden bed from its length, width and height.

Size the poly film for a hoop or tunnel greenhouse — cover width over the arch, roll length and the end-wall sheets.

Get the flexible pond liner length and width from your pond size, depth and overlap — plus the approximate water volume.

Size a pond or waterfall pump — the flow you need from spillway width, and the turnover your pond volume demands.

Count deck railing balusters and get the exact even gap that keeps the spacing under the 4-inch safety limit.

Space landscape path lights evenly and size the transformer — fixture count, even spacing and total wattage.

Count the sod rolls and pallets your lawn needs from its area, the roll coverage and a waste allowance.

Turn your vet’s mg/kg dose into milligrams, tablets (rounded to halves or quarters) or millilitres for your dog’s weight, with daily and course totals — and compare it with the published reference range for common vet-prescribed dog medicines. Explains why ibuprofen, naproxen and acetaminophen are dangerous for dogs.

Estimate a cat’s daily fluid volume and hourly drip rate from maintenance needs plus a dehydration deficit — the standard IV/SC fluid math.

Estimate your dog or cat’s Body Condition Score on the 9-point scale from current versus ideal weight, and see how much fat is excess.

See the healthy adult weight range for your dog’s breed-size class and whether your dog’s current weight falls inside it.

Calculate your dog or cat’s daily calorie needs with the veterinary RER and MER formulas, adjusted for life stage and activity.

Work out a dewormer dose from your pet’s weight: milligrams and millilitres from any label mg/kg rate, or the label amount for fenbendazole granules, pyrantel suspension and praziquantel tablets for dogs and cats, with species and age safety checks.

Estimate a puppy’s adult weight from its current weight and age, using breed-size growth curves that show how much growing is left.

Gauge how heavily your freshwater tank is stocked with the inch-per-gallon guideline, adjusted for filtration, and see your remaining capacity.

Estimate the heating wattage a reptile enclosure needs from its size and the temperature it must rise above the room, then round to a real bulb.

Work out the minimum cage width, length and height a pet bird needs from its wingspan, plus the safe bar spacing for its size.

Estimate a horse or pony’s body weight from heart-girth and body-length measurements using the standard weight-tape formula.

Estimate the total daily drinking water a group of livestock needs by species and head count, with an adjustment for hot weather.

Estimate how many washing-machine loads your household runs each week from the number of people, the clothes they go through and your machine capacity.

Work out how many dishwasher cycles your household runs each week from the number of people, meals eaten at home and your machine’s place-setting capacity.

Estimate how many bin liners your household gets through in a month from the number of people, the waste each generates and your bag size.

Find out how many rolls of paper towel your household uses per month and per year from your daily sheet count and the sheets on each roll.

See how long your toilet-paper stock will last from the rolls on hand, the number of people and the sheets each person uses per day.

How many lumens a room needs and how many bulbs or fixtures that takes: room size or area, room use or a custom foot-candle or lux level, bulb presets, an optional ceiling-height and wall-color correction, a layout grid, wattage and yearly running cost.

Find the right extension-cord wire gauge (AWG) for a device from its wattage or amps and the length of cord you need to run.

Estimate the joule rating you need in a surge protector from the number and value of the devices you want to protect.

Work out how much water your real Christmas tree drinks each day and how often to top up the stand, based on its trunk diameter and room warmth.

Get a watering interval and how much water to give a houseplant, based on its type, pot size, the season and light level.

See how long a humidifier tank lasts and how often you’ll refill it, from the tank size, mist output and hours you run it each day.

Work out the CADR an air purifier needs for your room — by dimensions, floor area or volume, target air changes per hour or clean air per occupant — and check a purifier’s ACH, clearing time and running cost.

Estimate the fuel bill for a DIY move — rental trucks guzzle gas, so a long haul can cost more in fuel than the truck rental itself.

Decide whether to pay monthly for a storage unit or just move (or replace) your belongings — and find the month where storage stops paying off.

Estimate how much cash you can raise by selling furniture, appliances and household goods when downsizing — used items resell for a fraction of what you paid.

Estimate what a yard or garage sale will actually earn — items priced low, only a fraction sell, and permit or table costs eat into the take.

Plan garage shelving from your wall length — how many shelf units you need, the total storage feet you gain and what it costs.

Add up the real cost of a home office — desk, chair, monitor, computer and the accessories people forget — and see the monthly cost spread over its lifespan.

Weigh a standing desk’s price against the extra calories you burn standing — see the yearly energy difference and the cost per pound of fat-equivalent it represents.

Put a dollar figure on your commute — how many hours a year it eats and what that time is worth at your hourly rate.

Add up everything in your work bag and check the total against your body weight — an overloaded daily carry is a common cause of shoulder and back strain.

Compare an umbrella and a raincoat on cost per rainy use over their lifespans — the cheaper sticker price is not always the cheaper choice.

Count how many garments you keep in active rotation versus in seasonal storage across a year — the number that decides how much closet and off-season storage you need.

Compare years of laundromat trips against buying a washer and dryer — including the per-load cost of water, power and detergent at home — and find the break-even point.

Estimate how many cords of firewood a whole heating season needs from your heat load, hours and wood species.

Estimate the gallons of heating oil and the dollar cost a whole heating season takes from your furnace load and hours.

Work out the propane gallons, tank refills and cost a whole heating season needs from your furnace load and run hours.

Estimate the gasoline and cost your snow blower burns over a winter from the number of clearings and time per job.

Work out how much rock salt your driveway needs per ice event and across the winter — pounds, bags and cost.

See what running your air conditioner costs each day, month and over the whole cooling season at your electricity rate.

Estimate the energy and fuel cost to heat your pool a set number of degrees, for gas, propane or electric heaters.

Find how much frost cloth your beds need and whether your cover keeps plants above freezing on a cold night.

See how many gallons your roof sheds in a rainfall and how many rain barrels that fills.

Check whether your gutters and downspouts can handle a heavy storm: peak runoff from your roof area, pitch and rainfall intensity, the number of downspouts needed for 2×3, 3×4 or round outlets, a gutter trough check and a table for 1–8 in/hr storms.

Estimate how much water your sump pump moves in a storm, its total run time and duty cycle from rainfall and pump flow.

Plan how much fuel a power outage takes — gallons, cans and cost from your run schedule and generator consumption.

Find exactly how much wrapping paper a box or tube needs — the sheet size to cut, the best way to lay it on the roll, how many gifts a roll covers, how many rolls to buy for several gifts, the cost per gift and the ribbon length — in centimetres or inches.

Work out how much ribbon a wrapped gift needs — the cross-wrap around the box plus the loops and tails of the bow — before you cut.

Find the envelope size a card actually needs — the right clearance around a folded card — and see which standard envelope fits.

Estimate the cost of mailing a parcel from its weight and delivery zone using a base rate plus a per-unit and per-zone charge.

Estimate the declared value of your household goods for a move, and compare the premium against basic released-value coverage.

Find how many storage bins your stuff needs from its volume and the bin size — with a packing-efficiency allowance so bins are not overstuffed.

Check whether your car fits your garage — front, side and door-opening clearance — from the vehicle and garage dimensions.

Estimate how much snow sits on your driveway — volume and weight — from its area and the snow depth, so you know the job before you start.

Size a pool cover correctly — the overhang past the water on every side — for a rectangular, round or oval pool.

Find the clear safety zone a trampoline needs — the free space and total ground diameter — plus whether your yard has room.

Size the safe use zone around a swing set — the fall space in front and behind, based on the swing beam height — before you install it.

Size a garden shed to your gear — floor area from your equipment plus a walkway allowance — and see which standard shed footprint fits.

Turn a monthly grocery bill into a real cost per meal and per person per day — the number that actually tells you if you overspend.

Add up breakfast, lunch, dinner and snacks per person to get a real weekly, monthly and yearly food-plan cost for your whole household, with children, meals eaten out, pantry staples, food waste and sales tax, and see how it compares with the USDA Thrifty, Low-Cost, Moderate-Cost and Liberal food plans.

See what your daily coffee really costs across a week, a month, a year and a decade — the small habit that quietly adds up.

Compare a bottled-water habit against a home filter — setup, replacement cartridges and all — and see the yearly savings.

Find out how many months a home gym takes to pay for itself versus a membership, and what you save over three years.

Compare a streaming bundle price against subscribing to each service separately and see the monthly and yearly savings.

Compare a shared family cell plan against everyone paying for their own line and see the monthly and yearly savings per person.

Estimate the multi-policy discount from bundling auto and home insurance with one carrier — annual and monthly savings.

See how much you keep by pausing or cancelling subscriptions for a few months — total saved and the yearly run-rate.

Work out the real yearly value of a grocery rewards card after its annual fee — grocery, other spend and the effective rate.

See whether a warehouse club membership pays for itself: net annual benefit and the spend you need to break even.

See what switching from brand-name to store-brand products saves per item, per month and per year — and how much cheaper generics are.

See how many days a year your screen time adds up to, and what that time is worth.

Add up what your daily coffee costs per month, per year and over ten years.

Work out how much water your showers use and what they really cost — water, sewer and the energy to heat it with an electric, heat-pump, gas or propane water heater — per shower, month and year, for the whole household, with the saving from a low-flow head or shorter showers.

Estimate how long a battery takes to charge from its capacity, charger current and charging efficiency.

Split a gift budget across a list of people, giving close ones a bigger share.

Compare two package sizes by price per unit to find the real better deal.

Work out your real cost per printed page and monthly ink spend from cartridge price and page yield.

Estimate how long a bag of dog food lasts and what feeding your dog costs per day, month and year.

Compare two pizzas by price per square inch to see which size is actually the better deal.

Compare the yearly fuel cost of an electric car versus a gas car for your mileage.

Estimate the electricity cost of running holiday lights for the season.

See what each gym visit really costs based on your monthly fee and how often you actually go.

Estimate how long a speech, presentation, podcast or voice-over script takes to say out loud. Type a word count or paste the script, pick a speaking pace, add pauses, slide changes and Q&A, and see how many words fit your time limit.

How long a generator runs on the fuel you have — from its fuel use, its spec-sheet runtime or its size and your load — in hours and days, with runtime at 25–100% load, fuel to store for an outage, containers needed and fuel cost per hour, day and kWh.

Estimate how many hours a propane tank lasts for an appliance based on its BTU rating.

Estimate the monthly electricity cost of running a hot tub heater.

Compare two phone plans over time, including any upfront device cost, to find the cheaper deal.

Statutory holiday for full-time, part-time, shift, irregular-hours and part-year workers — 5.6 weeks pro rata in days or hours, starting or leaving part way through the leave year, the 12.07% accrual per pay period with rolled-up holiday pay, bank holidays by nation and pay for untaken leave.

How much ice to buy for a party — for drinks, chilling cans and bottles in coolers, and keeping food cold — by guest count, hours, weather and serving style, in pounds, kilograms and bags.

Expected calving, lambing, kidding, farrowing, foaling and whelping dates from the breeding date — or the birth season from the dates the male went in and came out, or the breeding date for a target birth date. Gestation by species, the normal window, pregnancy-check, vaccination, feeding and dry-off dates, and births by heat cycle.

Hatch date and lockdown date for chicken, duck, Muscovy, turkey, goose, quail, guinea fowl, pheasant and peafowl eggs from the set date — candling days, temperature and humidity settings, and expected hatch rate from fertility.

Blend two feed ingredients to a target protein (or any nutrient) percentage with the Pearson square — parts and percentages of each, kilograms for a batch, cost per kg of the mix, and a check that the target lies between the ingredients.

Convert a mixed herd to animal units, calculate the AUMs a pasture supplies from forage yield and utilisation, and find the stocking rate, grazing days available or acres needed — with animal-unit equivalents for cattle, horses, sheep and goats.

Rotational grazing plan: number of paddocks from rest period and grazing period, paddock size from herd forage demand and available forage per acre, days per paddock, and how the plan changes between fast spring growth and slow summer regrowth.

Days for a pig to reach market weight from current weight and average daily gain, feed required and feed cost from the feed conversion ratio, expected market date, carcass weight at dressing percentage and margin over feed and feeder cost.

Predicted dry matter intake for a lactating dairy cow from body weight, milk yield, milk fat and days in milk (NRC 2001), converted to as-fed forage and concentrate amounts, water needs and feed cost per litre of milk.

Fertiliser value of manure or slurry: nitrogen, phosphate and potash supplied per application from analysis or typical values by livestock type, first-year available N by application method, the equivalent bagged fertiliser saved and its dollar value.

Drops or millilitres of essential oil for a carrier-oil blend at a chosen dilution (0.5–5%), with safe maximums by use and age, roller-bottle and massage-blend amounts, drops per mL and how to split a blend across several oils.

Yards or metres of 54-inch upholstery fabric for a sofa, loveseat, chair, ottoman, dining seats or headboard — base yardage by furniture type, extras for pattern repeat, skirts, welting and extra cushions, and the cost.

Waist radius, cutting radius and fabric needed for a full, three-quarter, half or quarter circle skirt from waist measurement and skirt length — fold layout, hem length, whether it fits one fabric width and how many pieces to cut.

Fabric strip length and number of strips for a gathered ruffle, tiered skirt or gathered panel from the finished edge length, fullness ratio and fabric width — cut width with hems and seams, total yardage and gathering thread guidance.

Fabric for knife or box pleats around a waist or hip — pleat count, pleat width and depth, total flat width, number of panels and yardage for kilts, school skirts, pleated curtains or valances, with the layout on your fabric width.

Convert the yardage a pattern lists for one fabric width to the amount you need at another width (36, 45, 54, 60, 108 inches or 90–150 cm), in yards and metres, using the standard conversion chart with a nap/pattern-matching allowance.

Work out how wide to cut bias strips for piping (welting) from the cord diameter and seam allowance, the strip length with joins, the continuous-bias square, fabric needed for individual bias or straight-grain strips, cord to buy and how many cushions the piping covers. Metric and inch units.

How long it takes to learn a language from the US Foreign Service Institute categories (600 to 2,200 class hours) adjusted for target level (CEFR A2–C1), study pace, prior languages and immersion — total hours, weeks and months, and the calendar date you could reach your goal.

Convert yarn count between tex, decitex, denier, kilotex, English cotton count (Ne), metric count (Nm), worsted, woollen, linen lea, jute and yards per pound — or work it out from a weighed sample — with plied and mixed-ply resultant counts, denier per filament, approximate diameter, and the weight or length of any amount of yarn.

Fabric weight in grams per square metre and ounces per square yard from a weighed swatch or a full roll — GSM from a round-cutter sample, oz/yd² conversion, weight per linear metre at the fabric width, roll length from roll weight, and weight-class guidance.

Convert any Gregorian date to the Islamic (Hijri) calendar and back, using the official Umm al-Qura calendar of Saudi Arabia or the tabular (Kuwaiti) calendar. You get both results side by side, the weekday, the Arabic month name, every month of the Hijri year, and the dates of Ramadan, Eid and the other observances.

Find the Qibla — the direction to the Kaaba in Mecca — from any latitude and longitude as a compass bearing (great-circle initial bearing), with the magnetic declination adjustment for a compass, the distance to Mecca, the constant-bearing (rhumb) alternative and the sun-shadow method on Qibla days.

Fasting length for any date and location from Fajr (dawn) to Maghrib (sunset) using standard astronomical angles (18°, 15° ISNA or 12°), the suhoor and iftar times in local time, the fast length across the month, and high-latitude guidance.

Estimate a water well's yield from a drawdown-recovery test: casing storage per foot, gallons removed, recovery rate in gallons per minute, sustainable yield with a safety factor, and whether it meets household peak demand or needs a storage tank.

Size a water softener from water hardness (gpg or ppm, with iron compensation), household water use and days between regenerations: daily grain load, softener capacity needed, salt dose and efficiency, annual salt cost and bags per year.

Size a bathroom exhaust fan (8 ACH rule, 1 CFM per ft², HVI fixture method and ASHRAE 62.2 50 or 20 CFM) and a kitchen range hood (CFM per linear foot, BTU-based for gas ranges, island multiplier), with duct size and length limits, make-up air threshold and sone noise guidance.

Paste text to get its Flesch Reading Ease score and Flesch–Kincaid grade level, with word, sentence and syllable counts, average sentence length and syllables per word, an interpretation of the score, and the sentence length that would hit a target grade.

Paste text to get the Gunning Fog index, SMOG grade, Flesch Reading Ease, Flesch–Kincaid grade, Coleman–Liau index and Automated Readability Index side by side, plus Linsear Write and FORCAST, a consensus grade, the hardest sentences, the words to simplify and the counts each formula uses.

Work out how two people are related from the number of generations each is below their most recent common ancestor: first, second or third cousin, once or twice removed, the genealogical degree of kinship, the expected shared DNA in centimorgans and percent, and the canon-law and civil-law degrees.

How many ancestors you have at each generation (2ⁿ) and in total, roughly when they were born, how many generations back a given year is, who any ahnentafel number is (relationship, side, sex, path), when pedigree collapse sets in, and how many of those ancestors actually passed you DNA.

Paste text to see the distribution of sentence lengths, the longest sentences, the share of long (over 25 words) and very long sentences, the estimated passive-voice rate, adverb density and word repetition — the plain-language metrics editors check alongside readability scores.

Find the extension ladder length you need for a working height or roof edge — 75° / 4:1 setup angle, base distance from the wall, the 3 ft (1 m) extension above a landing, section overlap, highest safe standing rung — and check an existing ladder's angle and reach.

Score a one-minute (or timed) oral reading probe: words correct per minute, accuracy percentage, reading level (independent, instructional, frustration), the percentile band against Hasbrouck–Tindal grade-level norms for fall, winter and spring, and the weekly growth needed to reach the next benchmark.

Size a wood or pellet stove for the space it must heat: BTU/h from floor area, ceiling height, insulation level, climate zone and layout, the small/medium/large stove class and firebox volume, the risk of oversizing, and whether the stove can heat the whole house or one zone.

Estimate how many pounds of pellets a stove burns per hour and per day at a given heat setting, bags and tons for the season from heating degree days or hours of use, hopper run time between refills, the cost per day and per season, and the electricity the auger and blowers use.

Estimate how long firewood takes to season to under 20% moisture by species, split size and stacking conditions, the weight a cord loses as it dries, the heat wasted burning wet wood, the moisture content from wet and dry weights, and when to cut so wood is ready for the burning season.

Estimate a projected release date from the sentence, jail credit and good-conduct time — federal 54 days a year with First Step Act credits and RDAP, or a state percentage, days-per-month credit, truth-in-sentencing floor and parole eligibility — with pre-release dates and time left.

Convert a custody schedule into each parent's overnights per year and parenting-time percentage — alternating weeks, 2-2-3, 2-2-5-5, 3-4-4-3, 4-3, every other weekend with or without midweek nights, your own repeating pattern or a yearly count — with summer, holiday and daytime adjustments, and check it against the shared-parenting thresholds child-support guidelines use.

Calculate how many calories your cat needs per day — resting energy requirement × the WSAVA/AAHA factor for neutered, intact, indoor, senior, kitten, pregnant, nursing, weight-loss or weight-gain cats — then turn it into grams or cups of dry food, cans of wet food or a mix, per meal, with a treat budget and a week-by-week weight-loss plan.

Estimate when a dog will whelp from the mating date, ovulation date or LH surge — the 63-day gestation with its realistic window — plus the timeline for relaxin testing, ultrasound, X-ray puppy count, temperature monitoring and whelping-box preparation.

Estimate when a pregnant cat will give birth from the mating date — the 63–65-day feline gestation and its 58–70-day range — with the timeline for "pinking up", ultrasound, palpation, X-ray kitten count, diet changes, nesting and the signs that labour needs a vet.

Estimate a found or rescued kitten's age from its weight and developmental signs — eyes, ears, walking, teeth — then get the expected weight for that age, feeding frequency, litter training, the vaccination and deworming schedule and the spay/neuter window.

How much water should a dog drink per day? Calculate the normal range from body weight, life stage (puppy, adult, senior, pregnant, nursing), diet, activity and weather, in millilitres, cups, fluid ounces and bowl refills — compare it with the 1 oz per pound and veterinary maintenance rules, and check what your dog actually drinks against the vet threshold.

Build a day-by-day schedule for switching your dog (or cat) to a new food — 7-, 10- or 14-day gradual mixes with the exact grams of old and new food per meal from your daily amount and meal count, dated from your start day, with what to do if stools loosen.

Track a female dog's heat cycle from the first day of bleeding — the proestrus, estrus (fertile) and diestrus phases with dates, the most fertile days for breeding or the highest-risk days for avoiding it, when the next season is due by breed size, and when pyometra signs would appear.

Find out what your home's standby power costs — enter the vampire load in watts or tick typical devices (TV, set-top box, console, router, chargers, microwave, printer) to get kWh per year, the cost at your tariff, the share of your bill, CO₂, and which devices are worth putting on a switched strip or smart plug.

Is the ice thick enough? Gold's formula for the load clear lake ice can carry at a given thickness, the minimum thickness for people, groups, snowmobiles, ATVs, cars and trucks, how much to discount white or snow ice, and how many days of freezing weather it takes to grow ice to a target thickness with or without snow cover.

Convert compass bearings between magnetic, true and grid north using the local magnetic declination (east or west) and the map’s grid convergence or printed grid–magnetic angle. Enter degrees, mils, degrees-minutes-seconds or quadrant bearings (N45°30′E), update an old map’s declination with its annual change, and get back bearings, the compass setting and the off-course error if you skip the correction.

Plan storage for a card collection: 9-pocket (or 12-pocket) binder pages and binders for the cards you want displayed, penny sleeves, toploaders and semi-rigids for the valuable ones, 800-count and 5,000-count boxes for bulk, deck boxes, the shelf length and weight the collection takes up, and the cost of sleeving and boxing it all.

How many bottles fit? Capacity of a wall of individual-slot racking, diamond bins or case storage from the space you have, allowing for Burgundy, Champagne and magnum bottles, the weight on the floor, the cooling unit size for a walk-in cellar, and how long your collection lasts at your drinking and buying rate.

Plan a long-term food supply by calories: pounds of wheat, rice, oats, pasta, beans, milk powder, sugar, fats and salt for your household and months (scaled from the BYU one-year list), the buckets or #10 cans, shelf space, cost, freeze-dried comparison, and the water to cook it and drink.

Make water safe in an emergency: the drops or millilitres of household bleach for any volume at 5–6% or 8.25% strength, doubled for cloudy water, contact time, purification tablets needed, boiling time by altitude, the bleach and fuel a household needs for a set number of days, and what chlorine does not remove.

Build a 72-hour emergency kit you can actually carry: the pack weight limit from your body weight and fitness, typical weights for water, food, shelter, clothing, first aid, tools and documents, how many hours a day of walking that weight allows, what to cut when it is too heavy, and a car-kit versus carry-kit split.

How long is food safe when the power goes out? Hours before the refrigerator crosses 40 °F, how long a full or half-full freezer holds, how much block ice or dry ice keeps a fridge or freezer cold per day, what to throw out and what to keep after a given outage, and generator run-cycles that keep food safe on a few hours of fuel a day.

Work out when to leave ahead of a hurricane, wildfire or flood: the leave-by time from the arrival of dangerous conditions, traffic-slowed drive time, preparation and margin, whether your fuel gets you to safety when stations are dry, the water, food and cash to take, and a pre-departure checklist for the house.

Work out where the shade will fall: sun altitude and azimuth for your latitude, date and time, the shadow an awning or shade sail casts (how far it reaches and shifts), the sail size and mounting height needed to shade a patio at the hours you use it, awning projection for a window, and the season-to-season change.

How long will it take to clear the snow? Time to shovel, snow-blow or plow a driveway and walks by area and depth, the weight of snow you are moving (wet vs powder), calories burned and heart-safety warnings, the ice-melt or salt needed per application, and a season's cost of hiring a plow service versus buying a blower.

How long should a 14.2 kg LPG cylinder last and what does cooking cost? Days per cylinder from household size, meals and cooking style, monthly gas cost at your refill price and any subsidy, cylinders per year, the piped natural gas (PNG) equivalent per SCM, an induction cooktop comparison at your electricity tariff, the 5 kg free-trade and 19 kg commercial cylinder economics, and leak-and-safety checks.

Budget an RV road trip: fuel from distance and your real towing or motorhome mpg, campground nights at a mix of full-hookup, state-park and free sites, propane, tolls, food and activities, with the cost per day and per mile and a comparison to flying and hotels for the same trip.

How high to mount a TV: the screen-centre height for your seat, the bottom and top edges for 32″ to 100″ screens, the recommended viewing distance and the viewing angle if you mount it higher, in cm or inches.

What size washing machine do you need? From the people in your home, how much laundry each makes and how often you wash, get the load size and the recommended drum capacity in kg, lb and approximate cubic feet.

What size refrigerator do you need? Cubic feet and litres for your household size and cooking habits, the nearest standard size, and how much should be fresh-food space versus freezer.

Compare the monthly cost of cooking with LPG or natural gas against an induction or electric cooktop: electricity needed, cost per month, yearly savings, payback of the new cooktop and CO₂ — from the gas you use today.

Spot hidden price rises when a product shrinks: compare the old and new package size and price to get the real per-unit price change, the fair price for the smaller pack and the extra you pay.

Work out what a buy-one-get-one or buy X get Y deal really saves: effective discount per item, price per item, the cost of the quantity you need and why an odd extra item can halve the saving.

Add a restaurant or hotel service charge to a bill with sales tax or VAT: choose whether tax applies to the service charge, add an optional extra tip and split the total between people.

Estimate the VAT refund on tax-free shopping abroad: VAT included in the price, the share kept by the refund operator, the refund you actually receive and your real cost after the refund.

Add up what a dog or cat really costs — startup costs, food, vet care, insurance, grooming and extras — for the first year, every year after and the whole lifetime with inflation.

Plan your back-to-school shopping budget for every child — supplies, clothes and shoes, electronics, fees and activities — and see how much to save each week before school starts.

How much should you spend on an engagement ring? Compare the one-, two- and three-month salary rules with what you can actually save by the proposal date and pay in cash.

Find which car seat stage fits your child — rear-facing, forward-facing with harness, booster seat or seat belt — from age, weight and height, following AAP and NHTSA guidance.

Estimate the yearly greenhouse-gas emissions of what you eat — beef, lamb, pork, chicken, fish, cheese, milk, eggs, rice, bread and vegetables — in kg CO₂e from the Poore & Nemecek global food dataset.

Estimate how much single-use plastic you throw away each year — bottles, bags, coffee cups, takeaway boxes, cutlery, straws, wrappers and household bottles — and how much switching to reusables would save.

Find what time to leave for the airport and when to be at check-in, from your departure time, domestic or international flight, checked bags, travel time, parking and a traffic buffer — with a full airport timeline.

Check whether your passport is valid long enough for a trip under the 6-month rule, the Schengen 3-month rule or "valid for the stay" — validity left on arrival and departure and the latest date you can travel.

Did your dog eat chocolate? Enter the dog’s weight, the type of chocolate and how much was eaten to get the theobromine dose in mg/kg and the toxicity level from the Merck Veterinary Manual.

Did your dog eat sugar-free gum, mints or candy with xylitol? Calculate the xylitol dose in g/kg and compare it with the 0.1 g/kg low blood sugar and 0.5 g/kg liver failure thresholds.

Work out a diphenhydramine (Benadryl) dose for your dog by weight: mg per dose at 2–4 mg/kg, how many 25 mg tablets or mL of children’s liquid, and how often — with the products to avoid.

Calculate your cat’s body fat with the Feline Body Mass Index (FBMI): measure the rib cage and the back leg to see if your cat is underweight, ideal, overweight or obese, plus a target weight.

Find the right dog bed size from your dog’s length and shoulder height and how it sleeps — sprawled, on its side or curled up — with standard rectangular and round bed sizes in cm and inches.

Enter your puppy’s birth date to get the dates of every puppy shot: DAPP at 8, 12 and 16 weeks, rabies, the 6-month booster and optional leptospirosis and kennel cough — WSAVA and AAHA guidelines.

Will your sofa, couch or furniture fit through the door? Compare its depth, height and diagonal depth with the door opening, and check if it can turn a 90° hallway corner — in cm or inches.

Find the right chandelier size for your room: diameter from room length plus width, height from ceiling height, the size over a dining table and how high to hang it — in cm or inches.

Find the right stool height for your kitchen counter, island or bar: seat height from the counter height, counter vs bar stools, how many stools fit and the knee-space overhang (NKBA).

How many hours a day should your pool pump run? Calculate the turnover time from pool volume and pump flow, the daily run time for 1–2 turnovers, the electricity used and the monthly cost.

How much salt to add to a saltwater pool: enter the volume, current and target salt level (ppm) to get kg or pounds of salt and the number of bags — or how much water to replace if salt is too high.

Exact paper dimensions in mm, cm, inches and pixels at any DPI: A4 at 300 DPI is 2480 × 3508 px. Covers A0–A8, B4–B5, C4–C6, DL, US Letter, Legal, Tabloid and Mexican oficio.

How long will it take you to reach 10,000 hours of practice? Enter the hours you already have and your weekly routine to get the years, weeks and finish point — plus faster schedules compared.

How long is a video, lecture, podcast or audiobook at 1.25×, 1.5× or 2× speed? Get the new duration and the time saved, with a table for every common playback speed.

How many hours will you work in your life? Total working hours from your first job to retirement, the years of nonstop time that equals, and the share of your life and waking hours spent at work.

Find which years have exactly the same calendar as any year — same weekday for January 1 and same leap-year status — so you can reuse an old calendar or planner.

See the compounding power of small daily habits: how much better (or worse) you get by improving 1% a day for a year — 37.78× — or any rate and number of days.

Plan your yearly reading goal: books still to read, pages and minutes per day, books per month and whether you are ahead of or behind schedule on your reading challenge.

Convert fractional inches such as 3/8, 1 1/4 or 5/16 to millimeters, or find the nearest 1/8, 1/16, 1/32 or 1/64 inch for any mm size — for wrenches, drill bits, bolts and pipe.

Enter the total and the cash paid to see the change due and the fewest bills and coins to hand back — US-style, 1-2-5 (euro) or peso-style denominations — or how much is still owed.