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Math
Percentage calculatorFind a percentage of a number.Percentage change calculatorCompare an original value with a new value.Ratio calculatorSimplify a ratio of two integers.Power calculatorRaise a number to a power.Square root calculatorFind the non-negative square root of a number.Logarithm calculatorFind a logarithm using a positive base other than one.Linear equation calculatorSolve ax + b = 0, including cases with no solution or infinitely many solutions.Quadratic equation calculatorSolve ax² + bx + c = 0 for real or complex roots.Permutations calculatorCount ordered selections without replacement. Enter whole numbers 0 ≤ r ≤ n ≤ 100. Count ordered selections with replacement. Enter whole numbers n and r from 0 to 100.Combinations calculatorCount unordered selections without replacement. Enter whole numbers 0 ≤ r ≤ n ≤ 100. Count unordered selections with replacement. Enter whole numbers n and r from 0 to 100.Factorial calculatorCalculate n! for a non-negative integer up to 170.Greatest common divisor calculatorFind the greatest common divisor of two integers.Least common multiple calculatorFind the least common multiple of two integers.Random integer generatorGenerate random integers in an inclusive range, with or without repeats.System of linear equations calculatorSolve two linear equations in two variables, including systems with no solution or infinitely many solutions.Arithmetic sequence calculatorFind the nth term and sum of an arithmetic sequence from its first term and common difference.Geometric sequence calculatorFind the nth term and sum of a geometric sequence from its first term and common ratio.Scientific calculatorCalculate real-number expressions with powers, parentheses and common functions.Mean calculatorCalculate the arithmetic mean of a list of numbers.Median calculatorFind the middle value of an ordered list, averaging the two middle values when needed.Standard deviation and variance calculatorCalculate population standard deviation using the number of values as the divisor. Calculate sample standard deviation using the number of values minus one as the divisor.Percentile calculatorFind a percentile using type-7 linear interpolation. Calculate Q3 minus Q1 using type-7 linear interpolation.Fraction calculatorEnter integers of up to 15 digits without separators. Denominators must not be zero.Basic calculatorCalculate addition, subtraction, multiplication and division with parentheses.Number base converterConvert integers between binary, octal, decimal and hexadecimal.Fraction to decimal converterConvert a fraction to a decimal, including repeating decimals.Decimal to fraction converterConvert a finite decimal to an exact simplified fraction. Convert a repeating decimal to an exact simplified fraction.Prime factorization calculatorFind the prime factors of a whole number.Multiples calculatorList the first multiples of an integer.Roman numeral converterConvert a whole number to standard Roman numerals. Convert standard Roman numerals to a number.Scientific notation converterWrite a decimal exactly in scientific notation. Expand scientific notation to an exact decimal.Decimal rounding calculatorRound a decimal to a chosen number of places.Linear inequality calculatorax + b < 0Probability calculatorAll outcomes must be equally likely.Two-event probability calculatorP(A), P(B)2×2 matrix calculatorA + B, A − B, A × B, det(A), A⁻¹Bitwise calculatorAND, OR, XORTrigonometric functions calculatorsin, cos, tanAngle converter: degrees and radians° / radGraphing calculatorPlot y as a function of x within the selected range. Sampling can miss discontinuities; trigonometric functions use radians.
Geometry
Circle calculatorFind the area and circumference of a circle.Rectangle calculatorFind area and perimeter.Triangle area calculatorFind the area from base and height.Parallelogram area calculatorCalculate the area of a parallelogram from its base and perpendicular height.Trapezoid area calculatorCalculate the area of a trapezoid from its parallel sides and perpendicular height.Rectangular prism calculatorCalculate the volume and surface area of a rectangular prism from its length, width and height.Cylinder volume calculatorFind the volume of a cylinder.Sphere calculatorFind the surface area and volume of a sphere.Cone volume calculatorFind the volume of a cone.Pythagorean theorem calculatorFind the hypotenuse from the two shorter sides of a right triangle.
Engineering
Pressure calculatorCalculate uniform pressure from normal force and a positive area using P = F / A.Electric power calculatorCalculate DC or instantaneous power using P = V × I. AC average power also requires the power factor.Force calculatorChoose a model and calculate using its stated inputs and units.Kinetic energy and momentum calculatorChoose a model and calculate using its stated inputs and units.Ohm’s law calculatorChoose a model and calculate using its stated inputs and units.Single-phase AC power calculatorChoose a model and calculate using its stated inputs and units.
Money
Finance
Investment return calculatorCalculate investment profit and return from purchase cost, proceeds, distributions and fees. No annualization or taxes are included.Debt-to-income ratio calculatorDivide monthly debt payments by gross monthly income. This does not determine lending eligibility.Simple interest calculatorEstimate interest without compounding.Compound interest calculatorEstimate growth with a fixed annual interest rate.Loan calculatorEstimate a fixed monthly payment, excluding fees and insurance.Mortgage calculatorEstimate the monthly principal and interest on a fixed-rate home loan. Property taxes, insurance and fees are excluded.Car loan calculatorEstimate a fixed car loan payment from the price and down payment. Taxes and fees are excluded.Loan early repayment calculatorEstimate how extra monthly principal payments affect a fixed-rate loan’s repayment term and interest.Break-even calculatorFixed costs / Selling price per unitInflation calculatorUses the annual rate you enter as a constant assumption; this is not live inflation data. Purchasing power is expressed in today’s money.Sales commission calculatorBefore tax and deductions. Commission is rounded to two decimal places, with half rounded up.Target gross margin price calculatorMargin is profit divided by selling price. Include relevant costs and taxes in the entered cost. Price is rounded up to two decimals.Zero-interest instalment calculatorAssumes zero interest and one fixed fee entered by you. To preserve the total, some payments may be 0.01 higher. No other charges are included.Compound annual growth rate (CAGR) calculatorShows the average compounded annual rate between two positive values. Intermediate cash flows, fees and taxes are not included.Regular savings calculatorEstimate regular contributions at a fixed annual return, compounded at the contribution frequency. This is an estimate, not a guaranteed return; fees and taxes are excluded.Equal principal loan calculatorSee a fixed-rate monthly repayment schedule with principal and interest. Estimate a fixed-rate loan with equal principal repayments and decreasing interest.Loan repayment comparisonEstimate a fixed-rate loan with equal principal repayments and decreasing interest.Net present value calculatorInitial investment is paid now; each signed cash flow occurs at the end of an equal period. Enter one flow per line, up to 500; use a discount rate for the same period.Annuity calculatorFind present and future values of equal payments at a fixed rate per period. Payments occur at the start or end of equally spaced periods; results are rounded to two decimals.Stock average price calculatorEnter purchase quantities and prices on matching lines, up to 500 purchases in one currency. Fees are included; sales, splits and tax-basis rules are excluded.Dividend calculatorEstimate annual dividends and yield from the entered annual dividend per share and current price. Dividends can change; tax is excluded and prices are not live.SIP calculatorEstimate regular SIP investments; returns are not guaranteed.Present and future value calculatorOne amount, fixed rate and equal compounding periods; no extra payments, fees or taxes.Nominal and effective annual interest rate calculatorFixed rate and equal compounding periods; fees and taxes excluded.Gold value calculatorEnter your own pure-gold price; no live price is provided. This estimates metal value only; taxes, assay and dealer premiums are not automatic. Values are rounded to two decimals, half up.Salary converterConvert an hourly rate to estimated weekly, monthly and annual gross pay. Estimate hourly, weekly and monthly gross pay from an annual salary and your work schedule.Overtime pay calculatorEstimate gross overtime pay using an hourly rate, overtime hours and a multiplier you enter.EMI calculator with monthly scheduleEstimate a fixed-rate monthly instalment and its principal and interest.Philippines 13th-month pay calculatorEstimate the minimum gross 13th-month pay from basic salary earned during the calendar year.Indonesia THR holiday allowance calculator 2026Estimate the 2026 religious holiday allowance from monthly wages and service.
Health
BMI calculatorCalculate body mass index. BMI is a screening measure, not a diagnosis.Running pace calculatorFind your average pace from distance and time.Race time calculatorEstimate finish time at a constant pace; stops and changes in pace are not included.Pace and speed converterConvert minutes per kilometre to speed and pace per mile, or enter km/h to convert back. Times are rounded to the nearest second.
Everyday
Fuel consumption calculatorCalculate fuel consumption and cost.Electricity cost calculatorEstimate electricity used and its cost at a fixed rate.Average speed calculatorFind average speed from distance and time.Unit price calculatorFind the price per unit of quantity.Tile calculatorEstimate the number of tiles for a rectangular floor.Paint calculatorEstimate paint from wall area, coverage and coats.Concrete volume calculatorEstimate concrete volume for a rectangular slab.EV charging cost calculator / EV charging time calculatorEnter energy drawn from the grid and price per kWh. Other fees are not included. Enter energy delivered to the battery and average charging power. Actual power can vary.Slope calculatorΔh / dRegular polygon calculatorn, aReading time calculatorNumber of words / Words per minutePixels to print size calculatorpx / PPIRecipe scaling calculatorOriginal servings / Desired servingsSteps to distance calculatorNumber of steps / Step lengthFuel economy unit converterL/100 km, km/L, mpg US, mpg UKWallpaper roll calculatorEstimates whole rolls for vertical strips on one rectangular wall. Pattern matching, doors, windows and extra waste are not included.
Education
Grade percentage calculatorFind the percentage score.Attendance calculatorAttended sessions / Total sessionsFinal exam grade calculatorFind the exam score needed to reach a target course grade.GPA calculator by course creditsCalculate a credit-weighted grade point average on a scale you choose.Weighted grade calculatorFind a weighted average from percentage grades and their weights.
Conversions
Celsius to Fahrenheit converterConvert degrees Celsius to degrees Fahrenheit.Fahrenheit to Celsius converterConvert degrees Fahrenheit to degrees Celsius.Kilometres to miles converterConvert kilometres to international miles.Miles to kilometres converterConvert international miles to kilometres.Kilograms to pounds converterConvert kilograms to avoirdupois pounds.Pounds to kilograms converterConvert avoirdupois pounds to kilograms.Area unit converterConvert square metric and international customary units, hectares and acres.Volume unit converterVolume unit converter: mL, L, m³, gal US, gal UK, fl oz US, fl oz UK.Weight and mass unit converterWeight and mass unit converter: mg, g, kg, t, oz, lb, st.Speed unit converterSpeed unit converter: m/s, km/h, mph, kn, ft/s.Pressure unit converterPressure unit converter: Pa, kPa, MPa, bar, mbar, psi, atm.Energy unit converterEnergy unit converter: J, kJ, cal(th), kcal(th), Wh, kWh.Power unit converterPower unit converter: W, kW, MW, hp(mech), hp(metric).Time unit converterTime unit converter: ms, s, min, h, d, wk.Data storage unit converterData storage unit converter: b, B, kB, MB, GB, KiB, MiB, GiB.Data rate unit converterData rate unit converter: b/s, kb/s, Mb/s, Gb/s, B/s, kB/s, MB/s, MiB/s.Download time calculatorEstimates a constant transfer rate; network overhead and slowdowns are not included.Screen aspect ratio calculator16 : 9Cooking volume convertermL / LIPv4 subnet calculatorIPv4 CIDR /0–/32Temperature converterTemperature converter: °C, °F, K.Length unit converterConvert between metric, international customary and nautical length units.Nepal land area converter: ropani and bighaConvert Nepal land units using documented square-foot definitions.Taiwan ping to square metres converterConvert Taiwan ping and square metres.China mu land area converterConvert mainland Chinese mu, fen, li, hectares and square metres.
Dates
Date add or subtract days calculatorAdd or subtract calendar days from a Gregorian date.Time difference calculatorCalculate time between two 24-hour clock times. An earlier end time means the next day.Day of the week calculatorFind the weekday for a Gregorian calendar date.ISO week number calculatorFind the ISO week number and week-based year. Weeks start on Monday; week 1 contains the first Thursday.Business days calculatorCount Monday to Friday from the start date up to, but excluding, the end date. Optionally exclude holidays you enter; holidays are not loaded automatically.Date difference calculatorCount calendar days between two dates. The end date is excluded.Age calculatorCalculate completed years, months and days. When an anniversary date does not exist, use the last day of that month.Nepali date converter: BS to AD and AD to BSConvert Nepal’s Bikram Sambat and Gregorian dates.Nepali age calculator: BS and ADCalculate age using Nepal’s Bikram Sambat or Gregorian calendar.Japanese era date converterConvert dates between the Gregorian calendar and Japan’s Shōwa, Heisei and Reiwa eras.Persian date converter: Solar Hijri and GregorianConvert Persian Solar Hijri dates and Gregorian dates in both directions.Bangladesh Bangla date converterConvert between Bangladesh’s revised Bangla calendar and Gregorian dates.Bangladesh Bangla date calculatorFind the difference between dates or add and subtract days in the Bangladesh civil calendar.Bangladesh Bangla age calculatorCalculate age between dates in the Bangladesh Bangla calendar.Bangladesh Bangla monthly calendarView a Bangladesh Bangla month with Gregorian dates.Nepali calendar: Bikram Sambat month and Gregorian datesView a Nepali month with corresponding Gregorian dates.Nepali date calculator: BS and ADCalculate a date difference or add and subtract days, months or years.Persian date calculatorFind the difference between Solar Hijri dates or add and subtract days.Persian age calculatorCalculate age using Solar Hijri dates.Persian monthly calendarView a Solar Hijri month and its corresponding Gregorian dates.Civil Hijri date converterConvert Gregorian dates to and from the tabular civil Hijri calendar.Umm al-Qura date converterConvert Gregorian dates to and from the Umm al-Qura calendar.Ethiopian date converterConvert between the Ethiopian and Gregorian calendars.Indian National Calendar (Saka) converterConvert India’s National Saka calendar and Gregorian dates.Thai Buddhist Era date converterConvert modern Thai Buddhist Era and Gregorian dates.Unix timestamp converterUses UTC, not the local time zone.Hours and minutes to decimal hoursDecimal hours to hours:minutes is rounded to the nearest minute.Time zone converterUses this device’s time zone data, which may be outdated. Clock changes can make a local time nonexistent or occur twice; both possible instants are shown.Countdown timerUses this device’s time zone data, which may be outdated. Clock changes can make a local time nonexistent or occur twice; both possible instants are shown.Business days from a dateAdd or subtract weekdays, excluding the start date. Weekends and the holidays you enter are skipped; holidays are not loaded automatically.Work hours calculatorAn end time earlier than the start means the next day; equal times mean zero hours. Unpaid breaks are deducted. This uses clock times and does not adjust for daylight-saving changes.Chinese lunar calendar converterConvert Gregorian and Chinese lunar dates, including leap months.Chinese lunar calendarView Chinese lunar dates in a Gregorian month.Ethiopian monthly calendarEthiopian monthly calendarEthiopian age calculatorEthiopian age calculatorEthiopian date calculatorEthiopian date calculatorCivil Hijri date calculatorCivil Hijri date calculatorUmm al-Qura date calculatorUmm al-Qura date calculator
Regional
Brazil 13th salary calculator 2026Estimate gross and net 13th salary in Portuguese for Brazil.Norway wealth tax calculator 2026Estimate Norwegian wealth tax in Norwegian.Poland pension indexation calculator 2026Estimate pension indexation in Polish.Romanian pension points calculator 2026Estimate pension from points in Romanian.South Korea VAT calculator: standard 10%Estimate Korean standard-rate VAT from an amount before or including VAT.UK VAT calculator: add or remove VATEstimate VAT from a price before or including tax at a selected UK rate.India GST calculatorEstimate GST with a chosen rate and intrastate or interstate supply type.Japan consumption tax calculator: 8% and 10%Calculate Japanese consumption tax from tax-exclusive or inclusive amounts.Stamp Duty Land Tax calculator 2026Estimate residential SDLT for England and Northern Ireland, including eligible first-time buyer relief.US federal income tax calculator 2026Estimate 2026 federal tax on ordinary taxable income.Germany VAT calculator: 19% and 7%Calculate German VAT on one tax-exclusive or tax-inclusive amount at a selected rate.Mainland France VAT calculator: 20%, 10%, 5.5% and 2.1%Calculate VAT on one tax-exclusive or tax-inclusive amount using selected mainland French rates.Mexico VAT calculator 2026: 16% and border incentive 8%Estimate VAT on one amount at Mexico’s general rate or the qualifying 2026 border incentive rate.Spain VAT calculator: 21%, 10% and 4%Calculate VAT on one amount for Spain’s mainland and Balearic Islands at a selected rate.Peru IGV calculator 2026: 18%Calculate the combined Peruvian IGV and municipal promotion tax on one amount.Poland VAT calculator: 23%, 8% and 5%Calculate Polish VAT on one tax-exclusive or tax-inclusive amount at a selected rate.Australia GST calculator: 10%Calculate Australian GST on one GST-exclusive or GST-inclusive amount.New Zealand GST calculator: 15%Calculate New Zealand GST on one GST-exclusive or GST-inclusive amount.South Africa VAT calculator: 15%Calculate South African VAT on one tax-exclusive or tax-inclusive amount.Canada GST/HST calculator: 5%, 13%, 14% and 15%Calculate selected Canadian GST or HST on one tax-exclusive or tax-inclusive amount.Portugal VAT calculatorCalculate VAT for mainland Portugal, Madeira or the Azores.