Free maths calculators

Over 49 calculators that do the work and show you how the answer is reached, step by step. No sign-up, no limits.

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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 →

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Percentages6 calculators Averages4 calculators Scientific calculator2 calculators Compound interest3 calculators Unit conversion5 calculators Geometry7 calculators Proportions2 calculators Fractions4 calculators Powers and roots3 calculators HCF and LCM2 calculators Physics equationsOhm's law, speed, efficiency and more Chemistry equationsRelative formula mass, moles, concentration

Every calculator

Percentages

Percentage calculatorPercent of a number, what percent, percentage change What percent X is of YOne number as a share of another Percentage changeIncrease and decrease between two values VAT calculatorNet amount, gross amount and the tax Compound interestInterest compounding over time, year by year Fraction to percentageConverting a fraction or decimal into a percentage

Averages

Weighted average calculatorMean and weighted average — including grade averages Arithmetic meanThe sum of the numbers divided by how many there are MedianThe middle value of an ordered set ModeThe value that appears most often

Scientific calculator

Scientific calculatorPowers, roots, logarithms, trigonometric functions Logarithm calculatorA logarithm to any base

Compound interest

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

Unit conversion

Length converterMillimetres, centimetres, metres, kilometres, inches, feet, miles Mass converterMilligrams, grams, kilograms, tonnes, ounces, pounds Area converterSquare millimetres, centimetres, metres, ares, hectares, square kilometres Volume converterMillilitres, litres, cubic centimetres, cubic metres, gallons Time converterSeconds, minutes, hours, days, weeks, months, years

Geometry

Circle area and circumferenceArea of a circle and circumference from the radius Triangle areaArea from the base and height Rectangle area and perimeterArea and perimeter from two sides Trapezium areaArea from the two parallel sides and the height Cylinder volumeVolume and surface area of a cylinder Sphere volumeVolume and surface area of a sphere Pythagorean theoremHypotenuse and the missing leg

Proportions

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

Fractions

Fraction arithmeticAdding, subtracting, multiplying and dividing fractions Simplifying fractionsA fraction in its lowest terms Fraction to decimalConverting a fraction into a decimal Fraction to percentageConverting a fraction or decimal into a percentage

Powers and roots

Exponent calculatorA number raised to any power Square root calculatorThe square root of a number Nth rootA root of any degree

HCF and LCM

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

Physics equations

Ohm's lawFind potential difference, current or resistance with V = IR, including values in mA, kΩ and kV.Speed, distance and timeWork out speed, distance or time with s = vt, and the average speed for a journey in two parts.AccelerationCalculate acceleration from the change in velocity and the time taken, or find the final velocity or time.Kinetic energyCalculate kinetic energy, mass or speed using kinetic energy = 0.5 × mass × (speed)².DensityFind density, mass or volume with ρ = m/V, and see whether an object floats or sinks in water.EfficiencyCalculate efficiency as a percentage from useful and total energy, or from useful and total power.SUVAT equationsSolve constant-acceleration problems with the SUVAT equations: enter three values and the right equation is chosen for you.

Chemistry equations

Relative formula massType a formula to find its relative formula mass, Mr, and each element's share of it.MolesCalculate moles from mass, gas volume or number of particles, or the mass of a given number of moles.Avogadro constantFind the number of particles from moles or mass, or count the atoms in a sample.Percentage by massFind the percentage by mass of each element in a compound from its formula.ConcentrationFind the concentration of a solution in g/dm³ or as a percentage by mass, or the mass of solute it contains.MolarityFind concentration in mol/dm³ from moles or mass, or the mass of solute needed for a solution.

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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.

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