All calculators
51 free tools across 19 live categories. Search, filter and open any calculator instantly — nothing to install or sign up for.
Mortgage Calculator
Estimate your monthly mortgage payment, total interest and full amortization schedule from home price, down payment, rate and term.
Calculate FinanceLoan Calculator
Work out monthly repayments, total cost and interest for any fixed-rate personal, auto or student loan.
Calculate FinanceCompound Interest Calculator
See how savings grow with compounding, regular contributions and time — with a year-by-year growth chart.
Calculate HealthBMI Calculator
Calculate Body Mass Index in metric or imperial units and see the WHO weight category for your result.
Calculate NutritionCalorie Calculator
Estimate basal metabolic rate and daily calorie needs using the Mifflin-St Jeor equation and your activity level.
Calculate MathPercentage Calculator
Solve every common percentage question: percent of a number, percentage change, and what percent one number is of another.
Calculate EducationGPA Calculator
Compute a weighted grade point average from course credits and letter grades on the 4.0 scale.
Calculate FinanceTip Calculator
Split a bill fairly: choose a tip percentage, set the number of people and get the exact amount each person owes.
Calculate TaxesSales Tax Calculator
Add sales tax to a pre-tax price, or work backwards from a total to find the price before tax, at any state or local rate.
Calculate RetirementRetirement Calculator
Project your retirement savings from your current balance, contributions, employer match and expected return.
Calculate FinanceCredit Card Payoff Calculator
Find out how long a credit card balance takes to clear, how much interest it costs, and what extra payments save.
Calculate TaxesSalary & Paycheck Tax Calculator
Estimate take-home pay with a progressive income tax breakdown, bracket by bracket.
Calculate FitnessBody Fat Calculator
Estimate body fat percentage and lean mass with the US Navy circumference method.
Calculate HealthIdeal Weight Calculator
Compare ideal body weight across the Devine, Robinson, Miller and Hamwi formulas plus a healthy BMI range.
Calculate NutritionMacro Calculator
Turn a calorie target into daily protein, carbohydrate and fat grams for your chosen diet split.
Calculate FamilyPregnancy Due Date Calculator
Estimate your due date from the last menstrual period, with trimester progress and key milestones.
Calculate TimeAge Calculator
Calculate exact age or the duration between any two dates in years, months, days, hours and minutes.
Calculate Unit ConversionUnit Converter
Convert between metric and imperial units across length, mass, volume, area, speed, temperature and data.
Calculate AutomotiveFuel Cost Calculator
Work out the fuel cost of a journey from distance, efficiency and price — then split it between passengers.
Calculate BusinessDiscount & Markup Calculator
Calculate sale prices and savings from a discount, or work back from cost to markup and gross margin.
Calculate AutomotiveAuto Loan Calculator
Work out a car payment from price, down payment, trade-in, sales tax, fees and rate, with the full repayment schedule.
Calculate FinanceHourly to Salary Calculator
Convert between hourly, daily, weekly, biweekly, monthly and annual pay using your real hours and weeks worked.
Calculate FinanceInflation Calculator
See how inflation erodes purchasing power over time and what the same basket of goods will cost in future.
Calculate BusinessROI Calculator
Calculate return on investment as a percentage and the annualized rate that makes investments of different lengths comparable.
Calculate BusinessBreak-Even Calculator
Find how many units you must sell to cover fixed costs, plus contribution margin and break-even revenue.
Calculate MathFraction Calculator
Add, subtract, multiply and divide fractions with automatic simplification, mixed numbers and decimal equivalents.
Calculate StatisticsMean, Median & Mode Calculator
Paste any list of numbers to get mean, median, mode, range, variance and both sample and population standard deviation.
Calculate MathRatio Calculator
Simplify a ratio to lowest terms, scale it up or down, and solve a:b = c:x for the missing term.
Calculate TimeDays Between Dates Calculator
Count the days, weeks, months and business days between any two dates, weekends excluded on request.
Calculate TimeDate Calculator
Add or subtract days, weeks, months or years from any date and see exactly which weekday you land on.
Calculate BusinessTime Card Calculator
Add up a week of shifts with breaks, split regular from overtime hours and calculate gross pay.
Calculate ConstructionSquare Footage Calculator
Calculate the area of a rectangle, circle, triangle or trapezoid and convert it to square feet, meters, yards or acres.
Calculate ConstructionConcrete Calculator
Work out how much concrete a slab, footing or pad needs in cubic yards or meters, and how many bags that is.
Calculate ConstructionPaint Calculator
Estimate how much paint a room needs from wall dimensions, coats, doors and windows, in gallons or liters.
Calculate ConstructionTile Calculator
Count how many tiles and boxes a floor or wall needs, including a waste allowance for cuts and breakages.
Calculate HealthWater Intake Calculator
Estimate how much water to drink each day from body weight, exercise and climate, in liters, ounces or glasses.
Calculate NutritionProtein Intake Calculator
Work out a daily protein target in grams from body weight and whether you are maintaining, building muscle or cutting.
Calculate FitnessRunning Pace Calculator
Convert distance and time into pace per kilometer or mile, and predict your 5K, 10K, half and full marathon times.
Calculate FamilyOvulation Calculator
Estimate your ovulation date and fertile window from your last period and cycle length, projected three cycles ahead.
Calculate Real EstateRefinance Calculator
Compare your current mortgage against a refinance: new payment, monthly saving, and how many months it takes to recoup the closing costs.
Calculate Real EstateHouse Affordability Calculator
Find the highest home price your income supports, using the lender's front-end and back-end debt-to-income ratios plus tax and insurance.
Calculate Real EstateRent vs Buy Calculator
Compare renting against buying over your real holding period, including transaction costs, maintenance and the return on the deposit you did not spend.
Calculate Real EstateAmortization Calculator
See a complete month-by-month amortization schedule for any loan, and exactly what an extra monthly payment saves in interest and time.
Calculate FinanceDebt Payoff Calculator
Plan a route out of multiple debts and see exactly what the snowball and avalanche methods cost in interest and months.
Calculate FinanceSavings Goal Calculator
Work out how much to put away each month to reach a savings target by a deadline, with interest on both the balance and the deposits.
Calculate EducationGrade Calculator
Work out your weighted course grade so far, then find the exact score you need on the final exam to reach the grade you want.
Calculate HealthSleep Calculator
Find the bedtime or wake time that lands between 90-minute sleep cycles, so you wake up between cycles instead of in the middle of one.
Calculate FitnessOne Rep Max Calculator
Estimate your one-rep max from any set using four published formulas, with a percentage chart for programming your training.
Calculate EngineeringOhm's Law Calculator
Solve any two of voltage, current, resistance and power to get the other two, using Ohm's law and the power formula.
Calculate TechnologyBinary & Hex Converter
Convert numbers between binary, decimal, hexadecimal, octal and any base from 2 to 36, with byte-grouped binary output.
Calculate TravelTime Zone Converter
Convert a time between any two cities with daylight saving handled automatically, and see the offset difference between them.
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Ohm's Law Calculator
Solve any two of voltage, current, resistance and power to get the other two, using Ohm's law and the power formula.
Calculate TechnologyBinary & Hex Converter
Convert numbers between binary, decimal, hexadecimal, octal and any base from 2 to 36, with byte-grouped binary output.
Calculate TravelTime Zone Converter
Convert a time between any two cities with daylight saving handled automatically, and see the offset difference between them.
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