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- Calculators
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- Fields
- 8
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- 100
Math & Algebra
Percentages, fractions, roots, equations and the scientific keypad.
%PercentageFind a percentage of a number, what percent one number is of another, or the percentage change between two.Top 100 · #1Open →½FractionAdd, subtract, multiply and divide fractions and mixed numbers, simplified.Top 100 · #9Open →sinScientificA full scientific calculator: trigonometry, logs, powers, roots and factorials, typed or tapped.Top 100 · #8Open →√Square RootThe square root of a number, simplified radical form, and any nth root.Top 100 · #46Open →xⁿExponentRaise a number to any power, including negative and fractional exponents, or solve for the exponent.Top 100 · #49Open →logLogarithmLogarithms in any base: common (10), natural (e), binary (2) or your own.Top 100 · #50Open →x²QuadraticSolve ax² + bx + c = 0: real or complex roots, the vertex and the discriminant, with the parabola drawn.Top 100 · #51Open →n!Factorialn! exactly, every digit, for whole numbers up to 1000.Top 100 · #52Open →a:bRatioSimplify a ratio, scale it, or solve A : B = C : D for the missing value.Top 100 · #48Open →x̄AverageThe mean, median, mode and range of a list of numbers.Top 100 · #47Open →PPrime NumberIs it prime? If not, its smallest factor, and the primes just before and after it.Top 100 · #53Open →p·qPrime FactorsBreak a whole number into its prime factors, with exponents and every divisor.MathOpen →gcfGCFThe greatest common factor (GCD) of two or more whole numbers, by Euclid's algorithm.MathOpen →lcmLCMThe least common multiple of two or more whole numbers.MathOpen →modModuloThe remainder of a division, both as most programming languages give it and as mathematicians define it.MathOpen →|x|Absolute ValueThe absolute value of a number or expression, and the distance between two numbers.MathOpen →÷Long DivisionDivide step by step as on paper: quotient, remainder and every bring-down.MathOpen →≈RoundingRound to decimal places or to the nearest 10, 100 or any step, with the rounding rule you need.Top 100 · #57Open →10ⁿSci NotationConvert between ordinary numbers and scientific or engineering notation.Top 100 · #58Open →sfSig FigsCount the significant figures in a number, or round a number to a chosen number of them.MathOpen →mSlopeThe slope, angle, distance and equation of the line through two points.Top 100 · #54Open →a²PythagoreanFind the missing side of a right triangle, with its angles, area and perimeter.Top 100 · #55Open →θTrigonometryAll six trig functions of an angle, or the angle from a ratio, in degrees or radians.Top 100 · #56Open →⅟Complex FractionSimplify a fraction whose top and bottom are themselves fractions: (a/b) ÷ (c/d).MathOpen →=xEquation SolverSolve an equation in x, linear, polynomial or with functions, for every real solution in range.MathOpen →
Finance & Investment
Mortgages, loans, interest, savings and what money becomes over time.
MTGMortgageYour monthly home payment: principal and interest, plus property tax and insurance, and what the loan costs in interest.Top 100 · #3Open →LNLoanThe fixed monthly payment on a loan, and how much of what you repay is interest.Top 100 · #4Open →CARAuto loanThe monthly payment on a car loan after your down payment, trade-in, sales tax and fees.Top 100 · #25Open →CⁿCompound interestWhat a sum grows to when interest earns interest, with optional monthly additions.Top 100 · #5Open →PrtSimple interestInterest charged on the original amount only: I = P × r × t.Top 100 · #31Open →INVInvestmentWhat regular investing grows to at a steady yearly return, and how much of it is growth.Top 100 · #22Open →RETRetirementWhat your savings could reach by retirement, and the monthly income they could pay until the age you plan for.Top 100 · #23Open →SAVSavingsHow a savings account grows with regular deposits at your bank's rate and compounding.Top 100 · #24Open →GLSavings goalHow much to save each month to reach a goal by a deadline.FinanceOpen →AMAmortizationHow each payment on a loan splits between interest and principal, and how the balance falls year by year.Top 100 · #26Open →APRAPRThe annual percentage rate of a loan once its upfront fees are counted, solved from the payments.FinanceOpen →EAREffective rateThe real yearly rate (EAR, or APY) a nominal rate becomes once it compounds.FinanceOpen →PVPresent valueWhat a future sum, and optionally a stream of payments, is worth today at a discount rate.FinanceOpen →FVFuture valueWhat a sum today, plus a regular payment each period, is worth at a future date.FinanceOpen →NPVNPVWhether an investment beats your required return: its cash flows discounted to today, less what it costs.FinanceOpen →ROIROIThe return on an investment as a percentage of what it cost, and per year when you know how long it took.Top 100 · #29Open →CGRCAGRThe steady yearly growth rate that takes a starting value to an ending value.Top 100 · #30Open →INFInflationWhat an amount will cost in the future, or is worth in today's money, at an inflation rate you enter.Top 100 · #28Open →ANNAnnuityThe regular payout a lump sum can provide for a set time, or what a stream of payments is worth today.FinanceOpen →AFFLoan affordabilityThe largest loan a monthly payment you can afford will repay, at a given rate and term.FinanceOpen →HMEHome affordabilityThe home price your income supports under a debt-to-income limit, after your other debts, tax and insurance.Top 100 · #32Open →CCCard payoffHow long a card balance takes to clear at a fixed monthly payment, or the payment to clear it by a date.Top 100 · #27Open →DTIDebt-to-incomeThe share of your gross monthly income that goes to debt payments, as lenders measure it.FinanceOpen →72Rule of 72How many years money takes to double at a yearly rate: the Rule of 72 estimate beside the exact answer.FinanceOpen →RRReal returnWhat an investment will be worth in today's money once inflation is taken out, and its real yearly return.FinanceOpen →
Business & Tax
Margins, markups, tax, pay and the ratios a business runs on.
M%Profit MarginWorks out the share of a sale price that is profit, from what it cost and what it sold for.Top 100 · #18Open →MUMarkupFinds the selling price from a cost and a markup, or the markup from a cost and a price.BusinessOpen →−%DiscountWorks out the price after a discount and how much you save.Top 100 · #19Open →TXSales TaxAdds sales tax at the rate you enter to a price before tax.Top 100 · #15Open →RTXReverse Sales TaxTakes the sales tax back out of a total to find the price before tax.BusinessOpen →PProfitWorks out profit from units sold, the price and cost per unit, and your fixed costs.BusinessOpen →SPSelling PriceFinds the price to charge for the profit margin you want on a cost.BusinessOpen →BEBreak-EvenFinds how many units you must sell, and the revenue, to cover all your costs.BusinessOpen →GPGross PayWorks out gross pay per pay period, before tax and deductions, for hourly or salaried work.BusinessOpen →$/hSalary to HourlyTurns a yearly salary into the hourly rate it works out to.Top 100 · #20Open →h→YHourly to SalaryTurns an hourly rate into the yearly, monthly and weekly pay it adds up to.Top 100 · #21Open →OTOvertime PayWorks out overtime and total pay from your rate, hours and the overtime multiplier.BusinessOpen →CMCommissionWorks out commission on sales at your rate, and total pay with any base salary.BusinessOpen →VATVATAdds VAT to a net price or takes it out of a gross price, at the rate you enter.Top 100 · #16Open →ITIncome TaxWorks out income tax on progressive brackets you enter, with your effective and marginal rates.Top 100 · #17Open →PTProperty TaxWorks out yearly property tax from a property's value and the local rate you enter.BusinessOpen →DEPDepreciationBuilds a depreciation schedule by straight-line, declining balance or sum-of-years' digits.BusinessOpen →SLStraight-Line Dep.Spreads an asset's cost, less its salvage value, evenly over its useful life.BusinessOpen →IT×Inventory TurnoverWorks out how many times stock sells through in a period, and the days it sits on the shelf.BusinessOpen →CRCurrent RatioCompares current assets with current liabilities to show whether short-term debts are covered.BusinessOpen →QRQuick RatioMeasures whether the most liquid assets alone could pay short-term debts (the acid test).BusinessOpen →GPrGross ProfitWorks out gross profit and gross margin from revenue and the cost of goods sold.BusinessOpen →NPNet ProfitWorks out net profit and net margin after every cost, interest and tax.BusinessOpen →CFCash FlowAdds up operating, investing and financing cash flows into net cash flow and closing cash.BusinessOpen →CACCACWorks out what it costs on average to win one new customer, and how that compares with their value.BusinessOpen →
Health & Fitness
Body measures, energy, training and pregnancy dates. Estimates, not medical advice.
BMIBMIYour body mass index from your height and weight, and the WHO band it falls in.Top 100 · #2Open →BMRBMRThe calories your body burns at complete rest, from the Mifflin-St Jeor equation.Top 100 · #34Open →calCaloriesHow many calories a day keep your weight steady, and how many to lose or gain at a steady pace.Top 100 · #7Open →BF%Body FatYour body fat percentage from a tape measure, by the US Navy method.Top 100 · #33Open →IBWIdeal WeightYour ideal body weight by the four classic formulas, and the healthy BMI range for your height.Top 100 · #36Open →THRTarget Heart RateThe heart rate to aim for at a chosen training intensity, by the Karvonen method.Top 100 · #45Open →wkPregnancyHow many weeks and days pregnant you are on any date, your trimester and your due date.Top 100 · #37Open →EDDDue DateYour estimated due date from your last period, a conception date or an IVF transfer.Top 100 · #38Open →+kgPregnancy WeightThe weight gain the IOM recommends for your pre-pregnancy BMI, in total and by this week.HealthOpen →/kmPaceYour running pace per kilometre or mile from a distance and a time, and what it means for race times.Top 100 · #40Open →vRunning SpeedYour running speed from a distance and time, or from your pace, in km/h, mph and metres per second.HealthOpen →METCalories BurnedThe calories an activity burns for your weight and time, from Compendium MET values.Top 100 · #41Open →PProteinHow much protein a day suits your weight and what you train for.Top 100 · #42Open →H₂OWater IntakeHow much to drink in a day for your weight and the exercise you do.Top 100 · #43Open →PCFMacrosYour daily protein, carbohydrate and fat in grams for a calorie target and a diet split.HealthOpen →TDETDEEYour total daily energy expenditure: everything you burn in a day, at each activity level.Top 100 · #35Open →WHRWaist-to-HipYour waist-to-hip ratio and what the WHO cut-offs say about it.HealthOpen →LBMLean Body MassYour weight without body fat, estimated from height and weight by the Boer formula.HealthOpen →BSABody Surface AreaThe surface area of your body in square metres, by the Mosteller and Du Bois formulas.HealthOpen →1RMOne Rep MaxThe most you could lift once, estimated from a set of several reps, with a percentage table.HealthOpen →VO₂VO2 MaxYour aerobic fitness as VO2 max, from a 12-minute run or from your resting and maximum heart rates.HealthOpen →ZzSleepWhen to go to bed or set the alarm so you wake between 90-minute sleep cycles.Top 100 · #44Open →OvOvulationYour likely ovulation day and fertile window from your last period and cycle length.Top 100 · #39Open →CnConceptionWhen a baby was most likely conceived, from the due date, the last period or the birth date.HealthOpen →HRZHeart Rate ZonesYour five training heart rate zones, from your maximum heart rate or your heart rate reserve.HealthOpen →
Construction & Geometry
Materials for a job, and the areas and volumes of every shape.
m³ConcreteThe concrete for a slab or round columns, in cubic metres or yards and in premix bags.Top 100 · #72Open →ft²Square footageThe area of a room or plot in square feet and square metres, with an optional cost.Top 100 · #73Open →LPaintThe paint for a room's walls (and ceiling), less doors and windows, for the coats you will apply.Top 100 · #74Open →GRVGravelThe gravel for a path, drive or base, in cubic metres or yards and by weight.BuildOpen →MULMulchThe mulch for a bed: the volume, the bags and the weight.BuildOpen →TSTopsoilThe topsoil for a lawn or bed, in cubic metres or yards and by weight.BuildOpen →∠Roof pitchA roof's pitch from its rise and run: x in 12, the angle, the slope and the rafter multiplier.Top 100 · #78Open →STRStairsRisers, treads, total run and stringer length for a straight stair, checked against typical code limits.Top 100 · #79Open →TILTilesHow many tiles (and boxes) to cover a floor or wall, with a waste allowance.Top 100 · #75Open →FLRFlooringThe boxes of laminate, vinyl or wood flooring for a room, with waste and an optional cost.Top 100 · #76Open →BRKBricksThe bricks for a single-leaf wall from its size, the brick and the mortar joint.Top 100 · #77Open →DWDrywallThe sheets of drywall (plasterboard) for a room's walls and ceiling.BuildOpen →FNCFencePosts, rails and pickets for a straight run of fence.BuildOpen →DCKDeckingThe deck boards and joists for a rectangular deck, with a waste allowance.BuildOpen →πr²Circle areaA circle's area, circumference and diameter from its radius, diameter or circumference.Top 100 · #80Open →△Triangle areaA triangle's area from base and height, from three sides, or from two sides and the angle between them.Top 100 · #81Open →▭Rectangle areaA rectangle's area, perimeter and diagonal from its length and width.BuildOpen →CYLCylinder volumeA cylinder's volume, capacity and surface area from its radius (or diameter) and height.Top 100 · #82Open →SPHSphere volumeA sphere's volume, capacity and surface area from its radius or diameter.BuildOpen →CONCone volumeA cone's volume, slant height and surface area from its radius and height.BuildOpen →TNKTank volumeA tank's capacity and how much is in it, in litres and US gallons: upright or lying cylinders and boxes.Top 100 · #83Open →SASurface areaThe total surface area of a box, cylinder, sphere, cone or square pyramid.Top 100 · #84Open →PYRPyramid volumeA pyramid's volume from its square or rectangular base and its height.BuildOpen →⏢Trapezoid areaA trapezoid's area from its two parallel sides and the height between them.BuildOpen →▱Parallelogram areaA parallelogram's area from its base and height, and its perimeter and angle from the side.BuildOpen →
Physics & Engineering
Motion, energy, force, electricity and heat.
FForceNewton’s second law: find the force, the mass or the acceleration from the other two.Top 100 · #87Open →vVelocityWork out a velocity from distance and time, or a final velocity from a start speed and an acceleration.PhysicsOpen →aAccelerationFind an acceleration from a change in velocity, from force and mass, or from distance and time.Top 100 · #86Open →km/SpeedSpeed, distance or time: enter two and get the third, in the units you use.Top 100 · #85Open →KEKinetic energyThe energy of a moving mass, or the speed or mass that gives a known energy.PhysicsOpen →PEPotential energyGravitational potential energy from mass, height and gravity, or the height or mass for a given energy.PhysicsOpen →WWorkThe work a force does over a distance, at any angle, or the force or distance behind a known amount of work.PhysicsOpen →PPowerPower is energy per second: find the power, the energy or the time from the other two.Top 100 · #88Open →ρDensityDensity from mass and volume, or the mass or volume of a material of known density.Top 100 · #89Open →PPressurePressure is force spread over an area: find any one of pressure, force and area.PhysicsOpen →μFrictionFriction force from the coefficient and the normal force, with the normal force worked out from a mass on a flat or sloped surface if you like.PhysicsOpen →kxHooke’s lawSpring force, spring constant or extension from the other two, plus the energy stored in the spring.PhysicsOpen →JImpulseImpulse from a force over a time, or from the change in a mass’s velocity.PhysicsOpen →pMomentumLinear momentum from mass and velocity, or the mass or velocity behind a known momentum.PhysicsOpen →λWavelengthThe wavelength of light, sound or any wave from its frequency and the speed of the wave in its medium.PhysicsOpen →HzFrequencyA frequency from a wavelength and wave speed, or from the period of one cycle.PhysicsOpen →ΩOhm’s lawVoltage, current or resistance from the other two, with the power the circuit dissipates.Top 100 · #90Open →ΔVVoltage dropHow many volts a cable run loses, and what percentage of the supply that is, for copper or aluminium conductors.Top 100 · #91Open →WElectrical powerElectrical power from any two of voltage, current and resistance, with the energy it uses over time.Top 100 · #92Open →RResistanceThe total resistance of resistors in series or parallel, or a wire’s resistance from its material, length and thickness.PhysicsOpen →CCapacitanceCapacitors in series or parallel, or the capacitance of a parallel-plate capacitor from its size and dielectric.PhysicsOpen →PVIdeal gas lawSolve PV = nRT for pressure, volume, amount of gas or temperature.PhysicsOpen →QHeat transferThe heat needed to warm a material (Q = mcΔT), or the heat flowing through a wall by conduction.PhysicsOpen →τTorqueTorque from a force on a lever arm at any angle, or the force or arm length you need for a set torque.PhysicsOpen →ηEfficiencyHow much of the energy or power going in comes out as useful work, and how much is wasted.PhysicsOpen →
Statistics & Probability
Describe data, test it, and count the chances.
σStandard deviationHow spread out your numbers are around their mean, for a sample or a whole population.Top 100 · #59Open →s²VarianceThe average squared distance of your numbers from their mean.Top 100 · #60Open →zZ-scoreHow many standard deviations a value sits above or below the mean, and the share of a normal distribution below it.Top 100 · #66Open →PPercentileThe value below which a given percentage of your data falls, and where any value ranks.Top 100 · #67Open →QQuartilesThe three cut points that split your sorted data into four equal parts.StatsOpen →x̃MedianThe middle value of your data once it is sorted.Top 100 · #68Open →MoModeThe value or values that appear most often in your data.Top 100 · #69Open →PProbabilityThe chances of both, either, or neither of two independent events happening.Top 100 · #61Open →nCrCombinationsHow many ways to choose r items from n when the order does not matter, exactly.Top 100 · #62Open →nPrPermutationsHow many ordered arrangements of r items can be taken from n, exactly.Top 100 · #63Open →CIConfidence intervalThe range that likely holds the true mean, from a sample mean, standard deviation and size.Top 100 · #64Open →nSample sizeHow many responses a survey needs for a chosen confidence level and margin of error.Top 100 · #65Open →pP-valueThe p-value for a z or t test statistic, one- or two-tailed.StatsOpen →rCorrelationPearson's r: how closely two sets of paired numbers follow a straight line.StatsOpen →ŷLinear regressionThe least-squares line through paired data, its fit, and a prediction.Top 100 · #71Open →NNormal distributionThe probability of a value below, above or between points on a normal curve.StatsOpen →BBinomialThe chance of exactly, at most or at least k successes in n independent tries.StatsOpen →x̄wWeighted averageThe average when some values count for more than others, such as graded coursework.Top 100 · #70Open →GGeometric meanThe typical value of numbers that multiply together, such as growth rates.StatsOpen →HHarmonic meanThe right average for rates, such as speeds over equal distances.StatsOpen →IQRInterquartile rangeThe spread of the middle half of your data, and the fences that flag outliers.StatsOpen →5#Five-number summaryMinimum, first quartile, median, third quartile and maximum: the outline of a box plot.StatsOpen →CVCoeff. of variationThe standard deviation as a percentage of the mean, to compare spread across scales.StatsOpen →±Margin of errorThe plus-or-minus on a survey result, from the sample size and the share who answered.StatsOpen →RNGRandom numbersRandom whole or decimal numbers in any range, with or without repeats.StatsOpen →
Everyday & Conversions
Dates, time, units, grades and the sums of an ordinary day.
AgeAgeYour exact age in years, months and days on any date, and how long until your next birthday.Top 100 · #6Open →+dDateAdd or subtract days, weeks, months, years or business days from a date, or count the days between two dates.Top 100 · #11Open →h:mTimeAdd or subtract two lengths of time in hours, minutes and seconds.Top 100 · #12Open →hrsHoursThe hours and minutes between two clock times, less any break, including shifts past midnight.EverydayOpen →wkWork hoursHours worked from a daily shift, over the days you work in a week, and what they pay.Top 100 · #96Open →TCTime cardA week of start and end times, less breaks, added up into hours and pay with overtime.EverydayOpen →TZTime zonesWhat a date and time in one time zone is in another, with daylight saving worked out for that day.Top 100 · #97Open →mLengthConvert a length between metres, kilometres, inches, feet, yards, miles and more.Top 100 · #99Open →kgWeightConvert a weight (mass) between kilograms, grams, pounds, ounces, stones and tons.Top 100 · #100Open →°TemperatureConvert a temperature between Celsius, Fahrenheit, Kelvin and Rankine.Top 100 · #98Open →m²AreaConvert an area between square metres, square feet, acres, hectares and more.EverydayOpen →LVolumeConvert a volume between litres, millilitres, US and imperial gallons, cups, fluid ounces and cubic units.EverydayOpen →vSpeedConvert a speed between km/h, mph, metres per second, knots and feet per second.EverydayOpen →JEnergyConvert energy between joules, calories, kilowatt-hours, BTU, electronvolts and more.EverydayOpen →PaPressureConvert pressure between pascals, bar, psi, atmospheres, mmHg and inches of mercury.EverydayOpen →¤CurrencyConvert an amount between two currencies at an exchange rate you enter, in both directions.Top 100 · #10Open →mpgFuel economyConvert fuel economy between mpg (US and imperial), litres per 100 km and kilometres per litre.Top 100 · #93Open →miGas mileageYour car's mileage from the distance you drove and the fuel you put in, and what it cost.Top 100 · #94Open →tipTipThe tip on a bill, the total, and each person's share when you split it.Top 100 · #95Open →GPAGPAYour grade point average from letter grades and credit hours on the 4.0 scale.Top 100 · #13Open →A+Final gradeThe score you need on the final exam to finish the course with the grade you want.Top 100 · #14Open →W:HAspect ratioReduce a width and height to their aspect ratio, and find the missing side when you resize.EverydayOpen →PPIPPIA screen's pixel density from its resolution and diagonal size, with the dot pitch.EverydayOpen →/uUnit priceCompare two pack sizes by price per unit to see which is the better buy.EverydayOpen →ΔtTime differenceThe time between two dates and clock times, in days, hours and minutes.EverydayOpen →
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