All tools
171 tools you can use immediately. Every calculation stays in your browser.
Money
Tip CalculatorTip amount, total bill, and split per person.MoneyCompound Interest CalculatorFuture value of savings with deposits and compounding.MoneyLoan CalculatorMonthly payment, total interest, and payoff for fixed-rate loans.MoneyAuto Loan CalculatorEstimate monthly car payment from price, down payment, trade-in, rate, and term.MoneyMargin & Markup CalculatorConvert cost, selling price, margin %, and markup %.MoneyCredit Card Payoff CalculatorMonths to clear a balance and total interest.MoneyInflation CalculatorWhat an old amount is worth in another year.MoneySubscription Cost CalculatorWhat recurring payments cost per month and per year.MoneySavings Goal CalculatorHow long to reach a target with monthly deposits.MoneyExtra Loan Payment CalculatorTime and interest saved if you pay extra.MoneyHow Long Will It LastMonths of spending left in a balance.MoneySales Tax CalculatorPrice plus tax, or the pre-tax amount from a total.MoneyTrip Fuel Cost CalculatorWhat a drive will cost in fuel.MoneyEmergency Fund CalculatorThree-month and six-month savings targets.MoneyFair Bill SplitterSplit a bill by what each person ordered.MoneyMortgage Affordability CalculatorHow much house a salary and down payment can carry.MoneyRefinance Break-even CalculatorHow long until a cheaper rate pays its closing costs.MoneyRent vs Buy CalculatorWhich costs less over the years you would actually stay.MoneyCAGRThe single yearly rate between two values.MoneyFIRE PlannerYears to 25× spending, as a sketch.MoneyParking CostHourly parking with a daily cap.MoneyAnnual vs MonthlyWhich billing cycle is cheaper over a year.MoneyMortgage PaymentThe monthly principal and interest on a loan.Money50/30/20 BudgetNeeds, wants and savings from take-home pay.MoneySnowball vs AvalancheWhich debt order costs less interest.MoneyROIReturn on the money you put in.MoneyRule of 72Years to double, or the rate you need.Money
Time & Date
Age CalculatorExact age in years, months and days.Time & DateDate CalculatorDays between dates, add or subtract time, days until an event.Time & DateTime CalculatorAdd, subtract and measure durations.Time & DateWorking Days CalculatorBusiness days between dates, weekends skipped.Time & DateTime Zone ConverterOne clock time in two cities.Time & DateDays UntilCalendar days until or since a date.Time & DateTime MathAdd or subtract hours and minutes.Time & DateWeek NumberThe ISO week, its year, and the Monday to Sunday.Time & Date
Math
Percentage CalculatorPercent of a number, percent change, increase and decrease.MathPercentage ChangeHow much a number went up or down.MathFraction CalculatorAdd, subtract, multiply or divide two fractions.MathAverageMean, median and mode from a list.MathGCF and LCMGreatest common factor and least common multiple.MathRight TriangleThe missing side of a right triangle.MathTriangle AreaArea from base and height, or from three sides.MathRatio CalculatorA simplified ratio, and one side scaled.MathStandard DeviationSample and population spread of a list.Math
Work
Salary CalculatorHourly, monthly and yearly pay, converted both ways.WorkFreelance Rate CalculatorYearly goal to a day rate and hourly rate.WorkOvertime Pay CalculatorGross weekly pay with overtime.WorkTrue Hourly Wage CalculatorWhat the job pays after commute, unpaid time and costs.WorkBreak-even Point CalculatorHow many units you must sell to cover costs.WorkOrder QuantityEconomic order quantity for steady demand.WorkA/B Test ReadA one-look z-test for two conversion rates.WorkMeeting CostWhat a meeting costs in people’s time.WorkPay RaiseWhat a raise is worth per month and per year.WorkHours WorkedA shift, minus the unpaid break, plus pay.WorkTimesheetHours for several clock-in and clock-out rows.Work
Study
GPA CalculatorSemester and cumulative GPA from letter grades, percents, and credits.StudyFinal Grade CalculatorScore needed on the final to hit your target course grade.StudyGrade CalculatorWeighted average of assignments for your current course grade.StudyLetter Grade ConverterPercent to letter grade and back.StudyReadability Score CheckerFlesch ease, grade level, reading and speaking time.StudySurvey Sample SizeHow many replies a yes/no survey needs.StudyReading GoalPages per day to finish a book.Study
Health & Fitness
BMI CalculatorBody mass index from height and weight.Health & FitnessCalorie CalculatorDaily calorie needs from BMR and activity.Health & FitnessSleep CalculatorBedtimes and wake times that line up with sleep cycles.Health & FitnessRunning Pace CalculatorPace and finish time from distance and time.Health & FitnessCaffeine CalculatorWhen to stop coffee so you can sleep.Health & FitnessDue Date CalculatorEstimated due date and current week.Health & FitnessRace PredictorEstimate other race times from a recent result.Health & FitnessHeart Rate Zones CalculatorTraining zones from age and optional resting pulse.Health & FitnessNavy Body Fat CalculatorTape-measure body fat using the US Navy formula.Health & FitnessOne-Rep MaxEpley and Brzycki estimates from a set.Health & FitnessStep DistanceDistance from steps and stride length.Health & FitnessIdeal WeightA height chart, not a target you must hit.Health & FitnessOvulation WindowA calendar guess for fertile days.Health & FitnessConception DateThe likely week from a due date or a period.Health & FitnessWater IntakeA daily water starting point from weight.Health & FitnessHeat IndexHow hot humid air feels.Health & FitnessWind ChillHow cold the wind makes it feel.Health & Fitness
Shopping
Discount CalculatorSale price, percent off, and how much you actually save.ShoppingUnit Price ComparerWhich pack is cheaper per unit.ShoppingStacked DiscountTwo discounts applied one after the other.ShoppingPrice per WearWhat a garment costs each time you wear it.ShoppingReturn DeadlineLast day of a return window.ShoppingCoupon vs Percent OffWhich single discount leaves the lower price.Shopping
Internet
Download Time CalculatorHow long a file takes at your speed.InternetData SizeKB, MB, GB, and TB in binary units.InternetColor ContrastWhether text is readable on a background.InternetSubnet CalculatorNetwork, broadcast and usable hosts from an IPv4 CIDR.InternetSpeed ConverterMbps, MB/s and GB/s, using 8 bits per byte.InternetUnix TimestampSeconds or milliseconds, and the UTC and local time.Internet
Converters
Unit ConverterLength, weight, temperature, volume, speed and more.ConvertersDecibel AdderCombine two sound levels the right way.ConvertersClothing SizeEU size to a common US and UK chart.ConvertersAspect RatioReduce width and height to a ratio.ConvertersRoman NumeralsNumbers to Roman numerals and back.ConvertersPet AgeA rough human-year equivalent.ConvertersShoe SizeEU shoes to US and UK.ConvertersScreen PPIPixel density from size and resolution.ConvertersCoffee RatioHow much water for a dose of coffee.Converters
Generators
Password GeneratorStrong random passwords and passphrases, created in your browser.GeneratorsQR Code GeneratorCreate free QR codes for URLs, Wi-Fi, or text — download PNG or SVG.GeneratorsPassword Strength CheckerCheck a password without sending it anywhere.GeneratorsRandom NumberA number, or a few, from a range you set.GeneratorsUUID GeneratorRandom UUID version 4 values. Nothing is stored.GeneratorsLorem IpsumDummy words or paragraphs, with a cap.Generators
EV & Charging
Fuse Capacity CheckMain fuse minus household load → max EV charger headroom.EV & ChargingCharging Cost per 100 kmTariff × kWh/100 km × charging losses → cost per 100 km.EV & ChargingCharging TimeHours to go from one battery percent to another.EV & ChargingEV RangeHow far a usable battery goes at a set consumption.EV & Charging
Electrical
Voltage Drop CalculatorIEC/HD cable ΔU for Cu/Al, mm², 1-phase or 3-phase.ElectricalPhone BatteryHours left from mAh, percent, and drain.ElectricalOhm’s LawVolts, amps, ohms and watts.ElectricalResistor Color Code4-, 5- and 6-band colors to ohms, IEC 60062.ElectricalConduit FillCable area versus conduit area, with your own limit.ElectricalLED ResistorOhms and a nearest E12 or E24 value.ElectricalWatts to AmpsThe missing one of watts, volts and amps.Electrical
Home
Concrete CalculatorVolume and bags for a slab or footing.HomePaint CalculatorHow many tins a room needs.HomeHeating Cost CalculatorWhat a heater or furnace costs to run.HomeDew PointHow muggy the air actually is.HomeSolar PaybackYears until a solar system earns its cost.HomeTV DistanceHow far to sit from a screen.HomeWill It FitWhether a piece clears a doorway.HomeTile CalculatorTiles and boxes for a rectangular room.HomeSquare FootageArea of a rectangle, in metres or feet.HomeMulch CalculatorCubic metres and bags for a bed.HomePool VolumeLitres in a rectangular or round pool.HomeAC SizeA BTU starting point for a room.HomeStair CalculatorHow many steps fit a floor-to-floor rise.Home
Cooking
Recipe ScalerScale every ingredient to the servings you need.CookingAir Fryer ConverterOven temperature and time to air-fryer settings.CookingKitchen ConverterCups, tablespoons, teaspoons, ml and ounces.CookingOven TemperatureCelsius, Fahrenheit, and gas mark.CookingCups to GramsIngredient weight from a cup, spoon or millilitres.CookingBaker’s PercentageEvery ingredient as a percent of the flour.CookingPan Size ConverterHow much batter when the pan changes.CookingYeast ConverterActive dry, instant and fresh yeast by weight.CookingSourdough HydrationWater as a percent of all the flour, starter included.CookingHigh-Altitude Baking AdjusterA rule of thumb for baking above 3,000 ft.Cooking
Text
Word CounterWords, characters, sentences, reading and speaking time.TextCase ConverterUPPER, lower, Title Case, snake and more.TextExtra Space CleanerCollapse repeated spaces and trim each line.TextLine Break RemoverJoin broken PDF or email lines into paragraphs.TextFind and ReplacePlain text or a pattern, with a preview first.TextLine SorterSort lines and optionally drop duplicates.TextSlug GeneratorA clean URL slug from a title.TextText DiffAdded, removed and unchanged lines.Text
Travel
Jet Lag PlannerShift bedtime before you fly so arrival night is closer.TravelPacking ListA checklist from nights, climate and plans.TravelDrive Time CalculatorHours on the road from distance and speed.TravelTrip Budget CalculatorDaily costs, a total, and a per-person split.TravelDays Until DepartureA countdown to the day you leave.TravelSchengen 90/180 CalculatorDays used in the rolling 180-day window.TravelFlight Duration CalculatorReal hours between two local times.TravelPassport Validity CheckerThree-month and six-month checks against your return date.Travel
Cars
Fuel Economy CalculatorL/100 km, US mpg and UK mpg from one fill-up.CarsOil Change IntervalWhich limit arrives first, months or distance.CarsTrip Cost per PersonSplit fuel, tolls and parking across passengers.CarsTire Size CalculatorDiameter, sidewall and revolutions from the sidewall numbers.CarsTire Size ComparisonDiameter change and speedometer error.CarsWheel Offset CalculatorBackspacing and how far the wheel moves.CarsLease vs Buy CalculatorTotal paid, and what is left if you buy.CarsBraking Distance CalculatorReaction plus braking, with the friction stated.Cars
Files
Image ResizerScale a picture in the browser and download it.FilesImage CompressorA quality slider, then before and after size.FilesEXIF RemoverSee camera and GPS data, then download a copy without it.FilesImage Format ConverterJPEG, PNG or WebP, on this device.FilesImage CropA 1:1, 4:5, 16:9 or free frame, then a download.FilesPDF Merge and SplitCombine PDFs or extract pages, in the browser.FilesImage to PDFPlace images on A4 or Letter pages.Files