Free online calculators
Health, finance, dates, units and developer tools. Everything runs in your browser — no sign-up, no limits.
GPA calculatorCredit-weighted GPAEV charging cost calculatorCharging cost · range addedFuel cost calculatorFuel cost for a tripFuel economy calculatorkm/L · L/100 km · mpgCar finance calculatorMonthly payment · total interestDue date calculatorDue date · weeks alongOvulation calculatorFertile window · next periodBirthday calculatorDays lived · next birthdayTime difference calculatorDifference · add · subtractDay counterCountdown and days betweenBlood pressure category checkerRead your numbersCaffeine half-life calculatorCaffeine left at bedtimeExercise calorie calculatorCalories burned by activityBody fat percentage calculatorTape method · BMI estimateProtein intake calculatorDaily protein by goalDaily calorie calculatorTDEE by activity levelCurrency converterLive reference ratesRetirement savings calculatorBuild-up and draw-downInflation calculatorFuture cost · today’s valueDividend calculatorDividend income · capital requiredSavings goal calculatorWork backwards from the targetRecurring deposit calculatorSame amount every monthDeposit interest calculatorLump sum · simple or compoundBreak-even calculatorBreak-even price · break-even volumeAverage cost calculatorWeighted average of your buysLoan repayment calculatorAmount · rate · term → monthly paymentCron expression helperExplain · presets · field referenceText diffLine-by-line comparisonSQL formatterFormat · indent · keyword caseColour converterHEX ↔ RGB ↔ HSLRegex testerPattern · flags · matchesJWT decoderDecode header and payloadWord and character counterCharacters · words · sentences · bytesUnix timestamp converterTimestamp ↔ dateUUID generatorRandom v4 UUIDsSHA-256 and SHA-512 generatorSHA-256 · SHA-512URL encoder and decoderPercent-encode · decodeBase64 encoder and decoderEncode · decodeJSON formatterFormat · validate · minifyPercentage calculatorRatio · part · increase and decreaseNumber base converterBinary · octal · decimal · hexTemperature converter°C · °F · K · °RWeight convertermg · g · kg · t · oz · lb · stoneLength convertermm · cm · m · km · in · ft · yd · mi · NM
Also in other sections
Discount CalculatorFind the final price and how much you save from a list price and a percentage off.Tip CalculatorAdd a tip to the bill and split it across the table.Split the BillDivide a total across people and round up to a convenient amount.ROI CalculatorGet return on investment and profit from what you put in and got back.Simple InterestFind the final amount when interest is paid on the principal only.Compound InterestFind the final amount when interest earns interest.BMI CalculatorGet your body mass index and ideal weight from height and weight.BMR CalculatorFind the minimum calories your body burns doing nothing at all.Sleep Cycle CalculatorPlan sleep in 90-minute cycles so you wake between them.Daily Water IntakeEstimate how much water to drink from body weight and exercise time.