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Free Online Calculators

Everyday maths and homework calculations without memorising formulas. Many of the calculators also show how the answer was reached.

Percentage CalculatorSix classic percentage calculations plus a discount calculator, with results updating as you type.Fraction CalculatorCalculate with fractions and mixed numbers and see the simplified answer, the mixed number, the decimal and every step.Unit ConverterConvert between metric and imperial units in ten categories, both ways at once, with the formula spelled out and a table of common values.Random PickerSpin a wheel of names, draw winners from a list, generate random numbers, flip a coin, roll dice or split a group into teams.GPA CalculatorWork out your credit-weighted GPA on the 4.0 scale and see what you need in upcoming courses to hit your target.GCD and LCM CalculatorEnter two to ten whole numbers to get their greatest common divisor and least common multiple, with every step of the Euclidean algorithm shown.Prime Number CheckerFind out instantly whether a number is prime, see why, and get its prime factors plus the nearest primes above and below.Square Root CalculatorCalculate square, cube and nth roots, simplify radicals to their exact form, and work out powers and scientific notation in one place.Standard Deviation CalculatorPaste a list of numbers to get the sample and population standard deviation, variance, mean, median, mode, quartiles and a histogram.Abjad Numerals CalculatorType a word or phrase in Arabic script — or Turkish Latin letters for a rough estimate — and see its abjad value, word by word and letter by letter.Roman Numeral ConverterType a number to get Roman numerals, or type Roman numerals to get the number — invalid numerals are explained and corrected.

Which calculator for which job?

Use the percentage calculator for discounts, price increases, tips and “what percent of X is Y” questions; it also handles percentage change between two values. The fraction calculator adds, subtracts, multiplies and divides fractions and mixed numbers, which is handy for recipes and school work. The unit converter covers length, weight, temperature, volume and more, from metres and inches to Celsius and Fahrenheit. Students can use the GPA calculator to weight each course by its credits.

Checking homework step by step

The fraction, GCD and LCM and prime number calculators show the working, not just the answer: prime factorisations, every division step of the Euclidean algorithm and the simplified result. That makes it easy to compare against your own solution and spot exactly where it went wrong. The standard deviation calculator returns both the sample and the population value; check which one your assignment asks for, because on small data sets the two results differ noticeably.

Random picks and abjad numerals

The random picker spins a wheel of names, draws winners from a list, flips a coin, rolls dice or splits a group into teams. Results come from the browser’s cryptographic random number generator, so they cannot be predicted in advance. The abjad calculator adds up the traditional numeric values of Arabic letters to find the abjad value of a name or word. Every calculator runs in your browser, so your numbers and lists are never sent to a server.

Related guides

How to calculate your GPA and grade averageA GPA is a credit-weighted average: multiply each grade point by the course credits, add them up and divide by total credits. Here is how it works in the US and UK, with worked examples.How to calculate percentages: formulas with worked examplesAlmost every percentage question is one of six patterns. Learn the formula for each, see a worked example, and avoid the traps that catch even finance teams.

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