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Free maths calculators

Over 36 calculators that do the work and show you how the answer is reached, step by step. No sign-up, no limits.

36+calculators
10categories
£0always free

Most popular calculators

Percentage calculatorPercent of a number, what percent, percentage changeOpen calculator →Weighted average calculatorMean and weighted average — including grade averagesOpen calculator →Scientific calculatorPowers, roots, logarithms, trigonometric functionsOpen calculator →Compound interestInterest compounding over time, year by yearOpen calculator →Length converterMillimetres, centimetres, metres, kilometres, inches, feet, milesOpen calculator →Proportion calculatorSolve a proportion for the missing valueOpen calculator →

All categories

Percentages6 calculatorsAverages4 calculatorsScientific calculator2 calculatorsCompound interest3 calculatorsUnit conversion5 calculatorsGeometry7 calculatorsProportions2 calculatorsFractions4 calculatorsPowers and roots3 calculatorsHCF and LCM2 calculators

Every calculator

Percentages

Percentage calculatorPercent of a number, what percent, percentage changeWhat percent X is of YOne number as a share of anotherPercentage changeIncrease and decrease between two valuesVAT calculatorNet amount, gross amount and the taxCompound interestInterest compounding over time, year by yearFraction to percentageConverting a fraction or decimal into a percentage

Averages

Weighted average calculatorMean and weighted average — including grade averagesArithmetic meanThe sum of the numbers divided by how many there areMedianThe middle value of an ordered setModeThe value that appears most often

Scientific calculator

Scientific calculatorPowers, roots, logarithms, trigonometric functionsLogarithm calculatorA logarithm to any base

Compound interest

Compound interestInterest compounding over time, year by yearSimple interestInterest charged on the starting amount onlySavings calculatorSavings growth with a monthly top-up

Unit conversion

Length converterMillimetres, centimetres, metres, kilometres, inches, feet, milesMass converterMilligrams, grams, kilograms, tonnes, ounces, poundsArea converterSquare millimetres, centimetres, metres, ares, hectares, square kilometresVolume converterMillilitres, litres, cubic centimetres, cubic metres, gallonsTime converterSeconds, minutes, hours, days, weeks, months, years

Geometry

Circle area and circumferenceArea of a circle and circumference from the radiusTriangle areaArea from the base and heightRectangle area and perimeterArea and perimeter from two sidesTrapezium areaArea from the two parallel sides and the heightCylinder volumeVolume and surface area of a cylinderSphere volumeVolume and surface area of a spherePythagorean theoremHypotenuse and the missing leg

Proportions

Proportion calculatorSolve a proportion for the missing valueScale calculatorConvert a map distance into a real one

Fractions

Fraction arithmeticAdding, subtracting, multiplying and dividing fractionsSimplifying fractionsA fraction in its lowest termsFraction to decimalConverting a fraction into a decimalFraction to percentageConverting a fraction or decimal into a percentage

Powers and roots

Exponent calculatorA number raised to any powerSquare root calculatorThe square root of a numberNth rootA root of any degree

HCF and LCM

HCF calculatorHighest common factor of a list of numbersLCM calculatorLowest common multiple of a list of numbers

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Frequently asked questions

Yes. Every calculator works without signing up, without payment and with no cap on how many sums you run — on a phone too.

Yes. Alongside the answer you get the formula, the numbers substituted in, and a separate section walking through each step, so you can write out the whole method rather than just the final figure.

You can — and it is worth reading the steps while you are here. Teachers usually mark the method rather than the number, so understanding where the answer comes from pays off.

Yes. The pages open in the browser on a phone, tablet or computer — there is nothing to install.

Either a comma or a point works — the calculator reads both and shows the answer with a decimal point in English.

Unlock the Mathema lesson library

Leave your email and phone — we will take you through to the Mathema platform and open up the preparation library: problem sets, quizzes and lesson plans written by teachers.

We use your details only to set up the account and get in touch about a lesson. No spam.

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