Free Online Calculators & Unit Converters
Calculators for money, work, study and measurements, from percentages and loan schedules to statistics and unit conversions.
Scientific CalculatorType or tap expressions with trig, logs, powers and historyUnit ConverterLength, weight, temperature, volume, data, speed and morePercentage CalculatorPercent of, percent change, increase, discount and reverseFunction GrapherPlot up to five functions of x, pan and pinch to zoomMatrix CalculatorDeterminant, inverse, transpose, rank, RREF and productsNumber Base ConverterBinary, octal, decimal, hex and any base from 2 to 36Statistics CalculatorMean, median, mode, standard deviation, quartiles, histogramPrime Factorization & GCF/LCMPrime check, factorization, divisors, GCF, LCM and prime listsFraction CalculatorAdd, subtract, multiply and divide fractions and mixed numbersEquation SolverLinear, quadratic, cubic and systems of equations with stepsLoan CalculatorMonthly payment, total interest and amortization scheduleCompound Interest CalculatorGrowth with regular contributions, any compounding frequencyTip Calculator & Bill SplitterWork out the tip and split the bill between friendsDate CalculatorDays between dates, add or subtract days, age and countdownsTime Zone ConverterConvert a time across cities with daylight saving handledSavings Goal CalculatorHow much to save each month, or how long a goal will takeInflation CalculatorFuture cost, purchasing power and average inflation rateSalary to Hourly CalculatorConvert pay between hourly, weekly, monthly and yearlyGPA CalculatorTerm and cumulative GPA, weighted or unweightedGrade CalculatorWeighted course grade and the score you need on the finalRoman Numeral ConverterConvert numbers to Roman numerals and back, with checksRandom Number GeneratorFair random numbers in any range, with or without repeatsAspect Ratio CalculatorFind a ratio from pixels, or resize while keeping itScientific Notation ConverterConvert to and from scientific, E and engineering notationSignificant Figures CalculatorCount sig figs with the rules shown, and round to any numberHours CalculatorHours between two times with breaks, and add up durationsNumber to Words ConverterWrite any number in words: US, UK, checks, currency, ordinalDebt Payoff CalculatorSnowball vs avalanche: debt-free date and interest savedCheck Writing Amount in WordsWrite a dollar amount in words for a checkNumber to Words (Indian System)Rupees and numbers in words with lakh and croreMortgage CalculatorMonthly mortgage payment with taxes, insurance and PMIEMI CalculatorMonthly EMI for home, car and personal loans with scheduleCar Loan CalculatorMonthly car payment from price, down payment and rateStandard Deviation CalculatorSample and population standard deviation with stepsAverage CalculatorMean, median and mode of a list of numbersPercentage Change CalculatorPercent increase or decrease from an old value to a new onePercentage Increase CalculatorPercent increase between two numbers, or add a percentDiscount CalculatorSale price and savings for any percent offPercentage Difference CalculatorPercent difference between two values, compared to their averageAge CalculatorExact age in years, months and days, and days to next birthdayDays Until CalculatorCount the days until any date, holiday or eventDays From Today CalculatorWhat date is 30, 60 or 90 days from today (or before)?Binary to Decimal ConverterConvert binary numbers to decimal, with hex and octal tooDecimal to Binary ConverterConvert decimal numbers to binary, grouped in 4-bit nibblesDecimal to Hex ConverterConvert decimal numbers to hexadecimal, for colors and codeHex to Decimal ConverterConvert hexadecimal numbers to decimal, any lengthQuadratic Equation SolverSolve ax² + bx + c = 0 with real or complex roots and stepsGCF CalculatorGreatest common factor of two or more numbers, with factorsLCM CalculatorLeast common multiple of two or more numbersPrime Factorization CalculatorBreak any number into prime factors with exponentsDecimal to Fraction ConverterTurn decimals, including repeating ones, into fractionsFinal Grade CalculatorWhat you need on the final exam to get the grade you wantHourly to Salary CalculatorTurn an hourly wage into yearly, monthly and weekly payCentimeters to Inches ConverterConvert centimeters to inches with formula and chartInches to Centimeters ConverterConvert inches to centimeters with formula and chartMillimeters to Inches ConverterConvert millimeters to inches with formula and chartInches to Millimeters ConverterConvert inches to millimeters with formula and chartFeet to Meters ConverterConvert feet to meters with formula and chartMeters to Feet ConverterConvert meters to feet with formula and chartCentimeters to Feet And Inches ConverterConvert centimeters to feet and inches with formula and chartKilometers to Miles ConverterConvert kilometers to miles with formula and chartMiles to Kilometers ConverterConvert miles to kilometers with formula and chartKilograms to Pounds ConverterConvert kilograms to pounds with formula and chartPounds to Kilograms ConverterConvert pounds to kilograms with formula and chartGrams to Ounces ConverterConvert grams to ounces with formula and chartOunces to Grams ConverterConvert ounces to grams with formula and chartCelsius to Fahrenheit ConverterConvert celsius to fahrenheit with formula and chartFahrenheit to Celsius ConverterConvert fahrenheit to celsius with formula and chartMilliliters to US Fluid Ounces ConverterConvert milliliters to us fluid ounces with formula and chartUS Fluid Ounces to Milliliters ConverterConvert us fluid ounces to milliliters with formula and chartLiters to US Gallons ConverterConvert liters to us gallons with formula and chartUS Gallons to Liters ConverterConvert us gallons to liters with formula and chartUS Cups to Milliliters ConverterConvert us cups to milliliters with formula and chartMiles Per Hour to Kilometers Per Hour ConverterConvert miles per hour to kilometers per hour with formula and chartKilometers Per Hour to Miles Per Hour ConverterConvert kilometers per hour to miles per hour with formula and chartMegabytes to Gigabytes ConverterConvert megabytes to gigabytes with formula and chartGigabytes to Megabytes ConverterConvert gigabytes to megabytes with formula and chartKilobytes to Megabytes ConverterConvert kilobytes to megabytes with formula and chartSquare Feet to Square Meters ConverterConvert square feet to square meters with formula and chartAcres to Hectares ConverterConvert acres to hectares with formula and chartPSI to Bar ConverterConvert psi to bar with formula and chartBar to PSI ConverterConvert bar to psi with formula and chartKilojoules to Kilocalories ConverterConvert kilojoules to kilocalories with formula and chartKilowatts to Horsepower ConverterConvert kilowatts to horsepower with formula and chartNewton Meters to Foot-Pounds ConverterConvert newton meters to foot-pounds with formula and chartMiles Per Gallon (US) to Liters Per 100 Km ConverterConvert mpg to L/100 km with formula and chartLiters Per 100 Km to Miles Per Gallon (US) ConverterConvert L/100 km to mpg with formula and chartYards to Meters ConverterConvert yards to meters with formula and chartMeters to Yards ConverterConvert meters to yards with formula and chartStone to Kilograms ConverterConvert stone to kilograms with formula and chartKilograms to Stone ConverterConvert kilograms to stone with formula and chartTablespoons (US) to Milliliters ConverterConvert tablespoons (us) to milliliters with formula and chartTeaspoons (US) to Milliliters ConverterConvert teaspoons (us) to milliliters with formula and chartMilliliters to Cups (US) ConverterConvert milliliters to cups (us) with formula and chartKnots to Miles Per Hour ConverterConvert knots to miles per hour with formula and chartKnots to Kilometers Per Hour ConverterConvert knots to kilometers per hour with formula and chartHectares to Acres ConverterConvert hectares to acres with formula and chartSquare Meters to Square Feet ConverterConvert square meters to square feet with formula and chartCelsius to Kelvin ConverterConvert celsius to kelvin with formula and chartGigabytes to Terabytes ConverterConvert gigabytes to terabytes with formula and chartHorsepower to Kilowatts ConverterConvert horsepower to kilowatts with formula and chartKilocalories to Kilojoules ConverterConvert kilocalories to kilojoules with formula and chartFoot-Pounds to Newton Meters ConverterConvert foot-pounds to newton meters with formula and chartImperial Gallons (UK) to Liters ConverterConvert imperial gallons (uk) to liters with formula and chartZ-Score Calculatorz-scores, p-values, percentiles and critical valuesConfidence Interval CalculatorConfidence intervals for a mean or proportion, with full workingProbability CalculatorCombinations, two events, binomial and at-least-once oddsTriangle CalculatorSolve any triangle from three values, with a diagramArea CalculatorArea of rectangles, circles, triangles and 8 more shapesRatio CalculatorSolve A:B = C:?, simplify ratios, divide amountsSlope CalculatorSlope, line equation and more from two pointsLogarithm Calculatorlog, ln and log₂ in any base, with checkCredit Card Payoff CalculatorWhen you'll be debt-free and the interest you'll payFIRE CalculatorYour FIRE number and years to financial independenceRent vs Buy CalculatorCompare net worth from renting versus buying a homeLong Division CalculatorLong division with remainders and worked stepsGPS Coordinate ConverterDecimal degrees ↔ DMS ↔ degrees decimal minutesVolume CalculatorVolume of boxes, cylinders, spheres, cones and moreCombination Calculator (nCr)nCr and nPr with exact big numbers and lottery oddsBinomial Probability CalculatorP(X = k), P(X ≤ k) and P(X ≥ k) for n trialsNatural Log (ln) Calculatorln(x) with base e, plus log₁₀ and log₂