Math calculators

A full scientific calculator plus quick tools for percentages, fractions, averages and random numbers, each with the working shown.

• Scientific calculatorA free online calculator with scientific functions.
• Percentage calculatorPercent of a number, percentage share and change.
• Fraction calculatorAdd, subtract, multiply and divide fractions.
• Random number generatorRandom whole numbers in any range, with or without repeats.
• Average calculatorMean, median, mode, range and standard deviation.

All calculators

• Finance calculatorsLoans and mortgages, saving and investing, pay, prices and business numbers. Every calculator shows the arithmetic behind its answer and works in 22 currencies.
• Income tax calculators by countryEvery country taxes pay differently, so each calculator here follows that country's own rules — brackets, allowances, social contributions and credits — for the current tax year. Pick your country to see your take-home pay.
• Health and fitness calculatorsBody measurements, energy needs, pregnancy dates and training pace, in metric or US units. These are estimates for general information, not medical advice.
• Everyday calculatorsDates, ages, working hours and unit conversions — the small sums that come up every day.