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6,172 free calculators — more than any other site. Finance, health, math, science and hundreds of niches most sites skip, each one instant, accurate and showing its working every time.
6172
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01
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Mortgage Calculator
Estimate your monthly mortgage payment with property tax, insurance, PMI and HOA fees, then see the payoff date, a full amortization schedule and how much extra payments save.
02💰
Compound Interest Calculator
See how savings or investments grow with compound interest: monthly and yearly contributions or withdrawals, nine compounding options, tax, inflation and a year-by-year schedule.
03❤️
BMI Calculator
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.
04➗
Percentage Calculator
Solve every everyday percent problem with the working shown: X% of Y, X is what percent of Y, percent change, percent difference, increase or decrease by a percent, and reverse percentages.
05💰
Loan Calculator
Work out the payment, loan amount, term or interest rate of any fixed-rate loan, with monthly, biweekly or weekly payments, fees and APR, extra payments and a full amortization schedule.
06🍳
Sourdough Calculator
Turn a flour weight and your baker’s percentages into water, salt and starter — a full sourdough recipe with total dough weight.
07💻
Subnet Calculator
Enter an IPv4 address and CIDR prefix to get the network and broadcast addresses, subnet mask, wildcard mask, usable host range and host count.
08💹
SIP Calculator
Project the maturity value of a monthly SIP in mutual funds — total invested, estimated returns and growth year by year.
The full library
Browse every category
💰FinanceLoans, mortgages, interest, savings and salary math.609💹InvestingCompound growth, stock returns, dividends, retirement and FIRE.351❤️Health & FitnessBMI, calories, macros, heart rate and training numbers.652➗MathPercentages, fractions, geometry and algebra.443📊StatisticsZ-scores, confidence intervals, sample size and probability.185🔬SciencePhysics and chemistry — forces, energy, circuits, gas laws and reactions.168📅Date & TimeAges, date gaps, countdowns, durations and workdays.190🛒EverydayTips, fuel, electricity, shopping and around-the-house math.476🔨Construction & DIYConcrete, flooring, paint, roofing and material estimates.351🍳CookingRecipe scaling, unit swaps, ratios and kitchen timing.263🚗AutoCar loans, fuel costs, tires and ownership math.164📈BusinessMargins, markup, VAT, rates, payroll and startup numbers.444🏷️Seller FeesEtsy, eBay, Amazon, PayPal and marketplace fee & profit calculators.55👶Pregnancy & BabyDue dates, ovulation, milestones and growth.87🎓EducationGPA, grades, test scores and study planning.129🏃SportsPace, scoring averages and training numbers.286💻TechBandwidth, storage, screens, colors and developer math.353🎲FunPet ages, random numbers and playful calculators.105🎯HobbiesPhotography, music, gaming, aquariums, gardening and pastime math.400⚛️PhysicsMotion, forces, energy, momentum, waves and gravity.207🧪ChemistryMolar mass, moles, gas laws, solutions and reaction yields.144🧬BiologyGenetics, population growth, cells and lab biology.110
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The niches others skip
Beyond the basics: sourdough hydration, subnet masks, Elo ratings, resin costs — hundreds of tools you won’t find elsewhere.