Maths
Pick a tool. Each one answers as you type and shows how the result was worked out.
Scientific calculatorType an expression the way you would write it; the answer updates as you type.Fraction calculatorExact fraction arithmetic with the working shown, from common denominator to simplest form.Decimal to fraction calculatorTurn a terminating or recurring decimal into an exact fraction in lowest terms.Ratio calculatorReduce a ratio to its simplest whole numbers or scale it up and down.Proportion calculatorFill in three of the four values; the empty one is solved by cross-multiplication.Average calculatorMean, median, mode and range of any list of numbers.Standard deviation calculatorHow spread out your numbers are, for a sample or a whole population.Scientific notation converterWrite any number as a × 10ⁿ, in E notation or in engineering form, and back.Exponent calculatorWork out xⁿ exactly for whole powers, and accurately for any other.Root calculatorSquare, cube and nth roots, with exact simplified surds where possible.Logarithm calculatorFind the power a base must be raised to in order to give your number.Factorial calculatorThe product of every whole number from 1 to n, computed exactly.GCD and LCM calculatorThe largest number that divides them all, and the smallest number they all divide.Prime factorisation calculatorWrite a number as a product of primes and see at once whether it is prime itself.Quadratic equation solverEnter a, b and c to solve ax² + bx + c = 0.Rounding calculatorRound exactly, with the rounding rule of your choice.Significant figures calculatorHow many significant figures a number has, and the number rounded to as many as you need.Number base converterRewrite a number in another base, with binary, octal, decimal and hex shown together.Roman numeral converterNumbers to Roman numerals and back, with each place value explained.Random number generatorPress Generate for fresh random numbers in your range.Permutation and combination calculatorHow many ways to choose r items from n, when order does or doesn’t matter.