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Health & Fitness Calculators37
See category β- Adjusted Body WeightAdjusted body weight for drug dosing in obesity β with the range the adjustment factor actually spans, and a clear answer when the formula does not apply to you.
- BMICalculate your Body Mass Index, waist-to-height ratio, body fat percentage, and healthy weight range with ethnic-specific thresholds and personalized insights
- BMRCalculate your Basal Metabolic Rate, TDEE, and daily calorie needs using 3 scientifically validated formulas
- Body FatEstimate your body fat percentage with 5 science-backed methods β no calipers needed.
- Body Surface AreaAll five formulas at once β Mosteller, Du Bois, Haycock, Gehan-George and Boyd β plus how far apart they actually land, which is the part nobody publishes.
- Caloric DeficitCalculate your ideal calorie deficit and see how long it takes to reach your goal weight with a personalized plan.
- CalorieFind your daily calorie needs with zig-zag cycling, macro breakdown, and diet mode support for smarter nutrition planning
- Calories BurnedFind out how many calories you burn during any exercise or activity using scientifically-validated MET values
- Chinese Gender PredictorPredict your baby's gender using the ancient Chinese lunar calendar chart β with planning mode and zodiac insights.
- Conception DateEstimate when conception occurred based on your due date, last period, or ultrasound β plus your probable fertile window.
- FFMIFat-free mass index β how much muscle you carry for your height, with the height-normalised figure that the scales are actually built on.
- hCGTrack your hCG blood draw levels, calculate doubling time, and compare against normal pregnancy ranges with visual charts
- Heart Rate ZonesGet personalized training zones using Karvonen, LTHR, or 4 different MaxHR formulas β with sport-specific adjustments, fat burn zones, and calorie estimates
- Ideal WeightFind your ideal body weight using 7 science-backed formulas β with frame size, activity level, and ethnic adjustments
- ImplantationPredict your implantation window, see daily probability by DPO, and find the best day to take a pregnancy test.
- Intermittent FastingPlan your fasting schedule, calculate daily calories and macros, and see your estimated results.
- KetoCalculate your personalized keto macros for fat, protein, and net carbs with meal examples, electrolyte targets, and training day adjustments
- Lean Body MassCalculate your lean body mass with Boer, James, and Hume formulas β plus body composition chart, protein targets, BMR, TDEE, and actionable meal plans
- MacroCalculate your daily macros with dual BMR formulas, 8 diet types, custom ratios, protein analysis, and per-meal macro splitting β visualize your nutrition plan with our free macro calculator
- Maintenance CaloriesCalculate your TDEE, BMR, BMI, macros, and body composition with the most advanced free calculator β uses multiple formulas for maximum accuracy
- Menstrual CycleWhen your next six periods are due, which day of your cycle you are on today, and why a regular long cycle matters less than an irregular short one.
- One Rep MaxEstimate your one-repetition maximum using 7 proven formulas with warm-up calculator and strength standards
- OvulationTrack your fertile window, predict ovulation day, and plan ahead with a 6-month fertility calendar.
- Pregnancy Due DateCalculate your estimated due date using 5 methods β LMP, conception, ultrasound, IVF transfer, or known date with trimester timeline
- Pregnancy Weight GainHow much weight to gain, by your pre-pregnancy BMI and how many weeks you are β using the Institute of Medicine ranges that ACOG and the CDC follow.
- ProteinCalculate your optimal daily protein intake, get personalized meal plans, and discover the best high-protein foods for your diet
- Rest DayAdvanced recovery calculator with heart rate monitoring, hydration tracking, and personalized readiness scores
- Running PaceCalculate your pace, predict race times, get VDOT training zones, heart rate zones, and personalized split times for any distance
- SleepFind your perfect sleep schedule with personalized cycle timing, chronotype alignment, caffeine cutoff, light exposure plan, and recovery planning β free sleep cycle calculator
- Steps to CaloriesHow many calories your step count actually burned β from your weight, height and pace, and separating the calories the walk added from the ones you would have burned anyway.
- TDEECalculate your Total Daily Energy Expenditure using 3 scientific formulas with interactive charts and personalized calorie goals
- VO2 MaxFour ways to estimate it β a 12-minute run, a one-mile walk, a step test, or no test at all β each read against the norm for your age and sex, because 42 means nothing on its own.
- Waist-to-Height RatioAssess your cardiometabolic risk with a metric more accurate than BMI β plus get your target waist, BMI comparison, and personalized action plan
- Waist to Hip RatioWhere your body stores fat, not just how much β with the WHO thresholds, and the waist measurement on its own, because the ratio alone can hide a real risk.
- Water IntakeFind your personalized daily water intake based on weight, activity, climate, and lifestyle β not the generic 8 glasses rule
- Weight GainCalculate daily calories, surplus, macros, and body composition tracking to gain weight safely with Mifflin-St Jeor and Katch-McArdle formulas
- Weight LossCalculate your daily calorie target, deficit, and macros for safe weight loss with metabolic adaptation, dual BMR formulas, and body composition tracking
Finance Calculators39
See category β- 401(k)Estimate your 401(k) at retirement with employer match, catch-up contributions, and Roth vs Traditional comparison.
- AmortizationGenerate a complete amortization schedule and see how extra payments can save you thousands in interest.
- Auto LoanCalculate your monthly car payment, total interest, and see a full amortization schedule with trade-in and tax options.
- BudgetEnter your income and monthly expenses by category. See your balance, savings rate, and how your spending compares to the 50/30/20 rule.
- Colombian CesantΓas and InterestWork out your severance savings and the 12% interest that is paid to you directly β the part employers most often skip.
- Christmas BonusCalculate your aguinaldo, 13th month pay, or Christmas bonus for Mexico and Latin America with ISR tax estimation using official Art. 96 and Art. 174 methods.
- Compound InterestCalculate how your money grows with compound interest, regular contributions, and see the real impact of inflation and taxes on your returns
- True Cost of an EmployeeWhat an employee actually costs the company β employer contributions, annual benefits spread across the year, and the real multiplier for each country instead of a rule of thumb.
- Credit Card InterestSee exactly how much interest you're paying, your true cost, and how faster payments or a balance transfer can save you thousands.
- Credit Card PayoffFind out how long it takes to pay off your credit card, see the true cost of minimum payments, and discover how much faster you can be debt-free
- Debt PayoffCreate your personalized debt-free plan using snowball, avalanche, or minimum payment strategies.
- Brazilian FGTSWork out the monthly FGTS deposits and the termination penalty β with the 2% apprentice rate and the domestic-worker rule that replaces the 40% fine.
- Home AffordabilityFind out exactly how much house you can afford based on your income, debts, and local market rates β updated automatically for your country.
- Overtime Pay Calculator by CountryOvertime premiums under each country's own labour code β Mexico's double-then-triple rule, Colombia's night premium, and the fact that Spain has no legal multiplier at all.
- Income TaxEstimate your 2025 federal income tax, see your tax bracket, and calculate your effective rate with deductions and credits.
- InflationCalculate how inflation affects your money's purchasing power over time using historical CPI data or custom rates
- InterestCalculate how your money grows with compound interest, regular contributions, and see year-by-year projections.
- InvestmentSee how your money grows with compound interest, regular contributions, and year-by-year projections
- Spanish IRPF Income TaxYour annual Spanish income tax, with the detail almost every calculator gets wrong β the personal allowance is not deducted from the base, it is taxed and subtracted from the quota.
- Mexican ISR Income TaxThe Article 96 monthly tariff, with the one thing every other calculator hides β your marginal rate is not the rate you actually pay.
- LoanCalculate your monthly loan payment, total interest, and view a full amortization schedule. See how extra payments save you money.
- MortgageEstimate your monthly mortgage payment including principal, interest, taxes, insurance, PMI, and HOA β with a full amortization schedule.
- Net WorthAdd up everything you own and subtract everything you owe. See your total net worth, asset breakdown, and how you compare to benchmarks by age.
- PaycheckSee exactly how much you take home each paycheck after federal tax, state tax, Social Security, Medicare, and deductions.
- Personal LoanCalculate your monthly payment, total interest, and real APR including origination fees. See how extra payments save you thousands.
- Colombian Prima de ServiciosWork out Colombia's legally mandated service bonus β including the transport allowance most calculators leave out of the base, and the 360-day year.
- Rent vs BuyShould you rent or buy? Enter your local costs and see the breakeven year, total wealth comparison, and the true cost of homeownership vs renting over time.
- RetirementPlan your retirement savings and find out if you're on track to meet your financial goals
- Net Salary Calculator by CountryFrom gross to what actually reaches your account β social security and income tax shown as the two separate deductions they are, with each country's contribution ceiling.
- SalaryConvert your salary between hourly, daily, weekly, and annual. Adjust for time off and overtime to see your real earnings.
- SavingsPlan your savings strategy with compound interest, regular contributions, and annual increases to reach your financial goals.
- Savings GoalFind out how much you need to save each month, week, or day to reach your financial goal β with interest and inflation included.
- SeveranceCalculate your finiquito, liquidaciΓ³n, or severance pay for Mexico and Latin America. Includes ISR, SDI, vacation table, and indemnification by law.
- Simple InterestCalculate simple interest on loans or savings. Find total interest earned or owed, and see how simple interest compares to compound interest over time.
- Student LoanCalculate monthly payments, total interest, and payoff date for any student loan β with subsidized vs unsubsidized, extra payments (monthly/yearly/lump sum), IBR, and automatic country rates.
- TipCalculate the tip, split the bill, and settle up fast β with pre-tax options for any group size
- Mexican PTU Profit-SharingYour share of the 10%, split the way the law actually splits it β half by days worked, half by wages earned β and capped at three months' salary.
- Holiday Entitlement and Pay Calculator by CountryDays and holiday pay under each country's own code β calendar days versus working days, and the vacation premium that only two of them actually pay.
- VATCalculate VAT, IVA, ITBIS, IGV, or sales tax for 18 countries. Add, remove, or extract tax from any amount instantly.
Unit Conversion Calculators81
See category β- BytesKB, MB, GB and TB in both scales β decimal and binary β so you can see where the missing disk space went.
- Carats to GramsOne metric carat is exactly 0.2 grams β convert gemstone weights to grams, milligrams and ounces.
- Celsius to FahrenheitConvert Celsius to Fahrenheit instantly β essential for weather, cooking, travel, and science.
- CM to FeetConvert centimeters to feet and inches instantly β perfect for height conversions and measurements.
- CM to InchesConvert centimeters to inches instantly with a conversion table for common values.
- CM to MMConvert centimeters to millimeters for engineering, crafts, and precision work.
- Cuadras to HectaresConvert cuadras to hectares, acres, and square meters β the traditional land unit of Argentina, Uruguay, and Paraguay.
- Cups to GramsConvert cups to grams by ingredient β because a cup of flour is 120 g and a cup of honey is 340 g, and no single factor covers both.
- Cups to mLConvert cups to milliliters for cooking and baking. Includes tablespoons, teaspoons, and fluid ounces.
- Cups to QuartsConvert cups to quarts β four cups to a quart, unless your cup is the 240 mL labelling cup, in which case four of them overshoot by 14 millilitres.
- Cups to TablespoonsConvert cups to tablespoons β 16 per cup, unless your recipe is Australian, where the tablespoon holds four teaspoons instead of three.
- CurrencyConvert between 45+ world currencies using mid-market exchange rates.
- Days to SecondsConvert days to seconds β 86,400 by convention, though the Earth actually turns in 86,164 and is slowing down.
- Degrees to RadiansΟ radians is 180 degrees β convert angles for trigonometry, calculus and code, with the exact multiples of Ο.
- Fahrenheit to CelsiusConvert Fahrenheit to Celsius instantly β essential for weather, cooking, travel, and science.
- Fanegadas to HectaresConvert fanegadas to hectares, acres, and square meters β Colombia's traditional land unit.
- Feet to CMConvert feet to centimeters instantly β ideal for height, furniture, and room measurements.
- Feet to InchesConvert feet to inches β including decimal feet to sixteenths, the exact 25.4 mm inch, and the survey foot the US retired in 2023.
- Feet to MetersConvert feet to meters instantly β great for height, construction, and international measurements.
- Gallons to CupsConvert gallons to cups β sixteen either side of the Atlantic, which is the one number the US and imperial systems actually agree on, even though the cup itself does not match.
- Gallons to Fluid OuncesConvert gallons to fluid ounces β 128 in a US gallon, 160 in an imperial one, and the ounce itself is not the same size on both sides of the Atlantic.
- Gallons to LitersConvert gallons to liters instantly. Works for US and UK gallons with metric equivalents.
- Gallons to QuartsConvert gallons to quarts β four per gallon, because 'quart' is short for quarter. What the word does not warn you about is that three different quarts exist.
- Grams to OuncesConvert grams to ounces for cooking, jewelry, shipping, and everyday weight measurements.
- Grams to PoundsConvert grams to pounds using the exact 1959 definition β and see why a pound of gold weighs less than a pound of feathers.
- Hectares to TareasOne hectare is 15.9 Dominican tareas β the unit farms, deeds and crop statistics still use across the country.
- Hectares to AcresOne hectare is 2.471 acres β geometry against a day's ploughing, converted for land and crop figures.
- Inches to CMConvert inches to centimeters instantly with a reference table for common measurements.
- Inches to FeetConvert inches to feet and inches instantly β great for height, screen sizes, and measurements.
- Inches to MMConvert inches to millimeters instantly β perfect for engineering, hardware, and precision measurements.
- Joules to Calories4.184 joules make one calorie β and the calorie on a food label is a thousand of them.
- KB to MBDivide by a thousand β and find out whether that file will actually fit in an email.
- KelvinThe absolute scale: 0 K is absolute zero, and nothing exists below it. Convert to Celsius, Fahrenheit and Rankine.
- Kilograms to GramsOne kilogram is a thousand grams β and the only SI base unit whose name already contains a prefix.
- KG to LBSConvert kilograms to pounds instantly β essential for travel, fitness, shipping, and cooking.
- KG to StonesConvert kilograms to stones and pounds instantly β essential for understanding UK body weight measurements.
- KM to MilesConvert kilometers to miles instantly β perfect for running, driving, and travel distances.
- km/h to mphConvert road speeds between km/h and mph, with the actual limits you will meet abroad.
- Knots to MPHOne knot is one nautical mile per hour β convert to mph, km/h and m/s for sailing, flying and wind forecasts.
- kWh to BTUOne kilowatt-hour is 3,412 BTU β line up your electricity bill with air-conditioner and boiler ratings.
- LBS to KGConvert pounds to kilograms instantly β perfect for fitness, travel, shipping, and cooking.
- LengthConvert between 18 length units instantly β from nanometers to light-years.
- Liters to CupsA litre is 4.23 US cups, not four β the gap that catches people scaling soups and batch recipes.
- Liters to GallonsTwo gallons exist and they differ by 20% β convert litres to both the US and the imperial one.
- Liters to MillilitersConvert liters to milliliters β and learn why the liter is not an SI unit, and why 1 mL of honey is not 1 gram.
- Liters to PintsTwo pints exist: 473 mL in the US and 568 mL in the UK. A litre is 2.11 of one and 1.76 of the other.
- Manzanas to HectaresConvert manzanas to hectares, acres, and square meters β the standard land unit in Central America.
- MB to GBA thousand megabytes to the gigabyte β and what that actually buys you in streaming hours.
- Mbps to MB/sWhy a 100 Mbps plan downloads at 12.5 MB/s β convert internet speeds between bits and bytes.
- Meters to FeetConvert meters to feet instantly β ideal for height, construction, and real estate measurements.
- Meters to YardsA yard is 0.9144 m exactly β close enough to a metre to look interchangeable, and 9.4% off when it matters.
- Square Meters to Tareas628.86 mΒ² make one Dominican tarea β the crossover point between talking in metres and talking in tareas.
- Miles to FeetConvert miles to feet β 5,280 of them, a number that exists because a ploughed furrow beat the Roman legion in an argument settled by Parliament in 1593.
- Miles to KMConvert miles to kilometers instantly β perfect for running, driving, and navigation.
- mL to CupsThere are at least five cups in use worldwide. This one converts with the US customary cup of 236.59 mL.
- mL to Fluid Ounces100 mL is 3.38 fl oz β the same limit written two ways, and the reason cabin baggage rules look different on each side of the Atlantic.
- mL to TablespoonsA US tablespoon is 14.79 mL, a metric one 15 β and an Australian one is 20, which is four teaspoons, not three.
- mL to TeaspoonsA teaspoon is 4.93 mL in the US and 5 mL everywhere else β but the spoon in your drawer may hold anywhere from 2.5 to 7.
- MM to InchesConvert millimeters to inches instantly β essential for engineering, manufacturing, and precision work.
- MPG to km/LConvert US mpg to km/L, L/100 km and imperial mpg β one of these three scales runs backwards.
- MPH to KM/HConvert miles per hour to kilometers per hour for speed comparisons, travel planning, and vehicle specs.
- Ounces to PoundsSixteen ounces to the pound β with the fluid-ounce and troy-ounce traps spelled out.
- Fluid Ounces to CupsEight fluid ounces make a US cup exactly β but eight ounces of flour do not.
- OZ to MLConvert fluid ounces to milliliters instantly β essential for cooking, drinks, medicine, and travel.
- Pints to LitersConvert pints to liters instantly β supports both US and UK (Imperial) pint standards for cooking, beverages, and daily use.
- Pounds to GramsConvert pounds to grams exactly β including pounds-and-ounces weights like 7 lb 4 oz, and the stone used for body weight.
- PSI to BarTurn a psi gauge reading into bar, kPa or atmospheres β tyre placards, boiler gauges and dive cylinders.
- Quarts to LitersA US quart is 0.946 litres β close enough to a litre to be dangerous when you are filling an engine.
- Square Feet to Square MetersConvert square feet to square meters for real estate, construction, and floor planning.
- Square Meters to Square FeetOne square metre is 10.76 square feet β the length factor squared, which is where most people go wrong.
- Steps to MilesConvert steps to miles using your own height β the 2,000-steps-per-mile rule everyone repeats is calibrated for someone 6 ft 5 in tall.
- Stones to KGConvert stones to kilograms instantly with a reference table for common weights β perfect for UK to metric conversions.
- Tablespoons to mLConvert tablespoons to milliliters instantly β essential for cooking, baking, and medicine dosing with US, UK, and metric standards.
- Tablespoons to CupsSixteen tablespoons make a cup exactly β the halves are easy, the thirds are where recipes go wrong.
- Tareas to Square MetersConvert tareas to square meters, hectares, and acres β the Dominican Republic's land measurement unit.
- Teaspoons to TablespoonsConvert teaspoons to tablespoons β three to one everywhere except Australia, where it takes four.
- TorqueNΒ·m, ftΒ·lb, inΒ·lb and kgfΒ·m side by side β for torque wrenches, wheel nuts and carbon bike parts.
- Varas to MetersConvert varas to meters, feet, and inches β the traditional Latin American unit of length.
- Watts to Horsepower746 watts make one mechanical horsepower and 735.5 make one metric β convert both, side by side.
- Watts to Kilowatts1,500 W is 1.5 kW β and the reason you are here is probably the difference between kW and kWh.
- Years to WeeksConvert years to weeks β and see why the answer is 52.18, not 52, and what that leftover fifth of a week actually causes.
Everyday Calculators17
See category β- AgeCalculate your exact age with zodiac signs, life statistics, and planetary ages
- AverageMean, median, mode, range and standard deviation from a list you paste β because "average" means three different things and they rarely agree.
- DateAdd or subtract days, weeks, months, years from any date. Calculate the difference between two dates instantly.
- DiscountCalculate the sale price, savings amount, and final cost after discount and tax instantly.
- Electricity CostFind what any appliance costs to run per day, month and year β and see why the wattage on the label tells you almost nothing on its own.
- FractionAdd, subtract, multiply and divide fractions β with the common denominator, the simplified answer and the mixed number, not just a decimal.
- Fuel CostWork out what a trip costs in fuel β in US mpg, imperial mpg, L/100 km or km/L β and see why going from 15 to 20 mpg saves more than 40 to 50.
- GPACalculate your semester and cumulative GPA on the 4.0 scale. Enter course names, letter grades, and credit hours. Supports A+ (4.3), Pass/No Pass, and prior GPA.
- GradeCalculate your weighted grade, simple percentage, or find out what you need on the final exam to reach your target grade.
- PercentageCalculate percentages instantly β find X% of Y, what percent X is of Y, or the percentage change between two numbers.
- RatioSolve a : b = c : x, simplify any ratio, and get the scale factor β the number you actually need when doubling a recipe or reading a plan.
- Roman NumeralConvert numbers to Roman numerals and back β with the breakdown, and the reason clocks write IIII instead of IV.
- Sales TaxAdd sales tax to a price, or work backwards from a receipt total to the pre-tax amount β the reverse calculation almost every other calculator gets wrong.
- TimeAdd, subtract, and convert time durations with hours, minutes, and seconds.
- Time CardAdd up a week of clock-ins and clock-outs with breaks and overtime β in decimal hours, because 7 hours 45 minutes is 7.75 on a payslip, not 7.45.
- Unit PriceCompare two packages even when they use different units β ounces against grams, litres against fluid ounces β and see which one is actually cheaper.
- Word CountCount words, characters, sentences and paragraphs β with reading and speaking times based on measured averages, not the folklore 250 words a minute.
Technology Calculators9
See category β- BandwidthConvert between bandwidth units (Mbps, Gbps, MB/s) and estimate the bandwidth needed to host a website or service.
- CIDRConvert between CIDR notation, subnet masks, and IP ranges. Calculate network details with cloud provider support, supernet detection, and reverse IP-to-CIDR conversion.
- IP SubnetCalculate subnet mask, network address, broadcast, wildcard mask, and usable host ranges from any IPv4 address and CIDR prefix.
- PasswordGenerate strong random passwords, memorable passphrases, and secure PINs with real-time strength analysis and crack time estimates.
- Password StrengthAnalyze password entropy, detect weak patterns, and estimate crack times across 7 attack scenarios β including quantum computing. 100% private, nothing leaves your browser.
- PSUCalculate the ideal power supply wattage for your PC build. Accounts for overclocking, capacitor aging, 80 PLUS efficiency, and annual energy cost.
- RAIDCalculate RAID capacity, performance, rebuild time, and URE risk for all RAID levels
- Transfer TimeEstimate how long it takes to download, upload, or copy any file. Compares 20 interfaces including WiFi 7, Thunderbolt 5, and USB4 v2 β with real-world overhead.
- VLSMDivide a network into variable-size subnets using VLSM. Allocate IP addresses efficiently with minimum waste β enter your host requirements and get optimal subnets.
Math Calculators2
See category βHome & Construction Calculators10
See category β- BTUCalculate the BTU cooling or heating capacity needed for any room based on size, insulation, sun exposure, and occupancy.
- ConcreteEstimate cubic yards, bags, weight, cost, and rebar for slabs, columns, walls, and stairs.
- DrywallCalculate how many drywall sheets you need, plus screws, tape, joint compound, and cost estimates.
- FenceCalculate posts, pickets, rails, concrete, and materials needed for wood, chain link, or vinyl fencing projects.
- FlooringCalculate how much flooring material you need β in square feet, boxes, and estimated cost β for any room or project.
- Mulch & GravelCalculate how much mulch, gravel, stone, or soil you need in cubic yards and bags β with cost estimates.
- PaintCalculate how much paint you need for any room and estimate the total cost of your project.
- RoofingEstimate your roof area, materials needed, and project cost based on dimensions and roof pitch.
- Square FootageCalculate the area of any space in square feet, meters, or yards β for flooring, painting, landscaping, and construction projects.
- TileCalculate how many tiles you need plus grout, thinset, and cost estimates for any floor, wall, or backsplash project.