21 calculators

Math Calculators

Everyday arithmetic and school maths, done precisely. Each calculator explains the method so you can check the answer or learn the technique, from percentages and fractions to statistics.

Basic CalculatorAdd, subtract, multiply and divide with a clear on-screen keypad.
Scientific CalculatorTrigonometry, logarithms, powers, roots and factorials in degrees or radians.
Percentage CalculatorFind X% of a number, what percent one number is of another, or the whole from a part.
Percentage Increase/Decrease CalculatorPercentage change between two values, or a value raised or lowered by a percent.
Fraction CalculatorAdd, subtract, multiply and divide fractions and mixed numbers, simplified.
Average CalculatorThe arithmetic mean of any list of numbers, with sum and count.
Ratio CalculatorSolve A : B = C : D for the missing value, for scaling recipes, maps and mixes.
Ratio SimplifierReduce a ratio such as 24:36 or 1.5:2.5:4 to its simplest whole-number form.
Exponent CalculatorRaise any number to any power, including negative and fractional exponents.
Square Root CalculatorSquare roots, cube roots and any nth root, with simplified radical form.
Prime Number CheckerCheck whether a number is prime and see its prime factorisation.
GCD and LCM CalculatorGreatest common divisor and least common multiple of two or more numbers.
Rounding CalculatorRound to decimal places, significant figures or the nearest 10, 100 or 0.05.
Random Number GeneratorPick random whole numbers or decimals in any range, with or without repeats.
Standard Deviation CalculatorPopulation or sample standard deviation and variance, with a deviation table.
Mean, Median and Mode CalculatorMean, median, mode, range, minimum and maximum from one list.
Unit ConverterTwelve kinds of measurement in one converter: length, weight, temperature and more.
Age CalculatorExact age in years, months and days, plus total days and your next birthday.
Date Difference CalculatorYears, months and days between two dates, plus totals in weeks and days.
Days Between Dates CalculatorCount the days between two dates, with weekdays and weekends split out.
Time Duration CalculatorAdd and subtract durations in hours, minutes and seconds.

Showing your working

Every math calculator here prints the steps it took, in the same order you would write them on paper. That makes it easy to compare with homework or to spot where a manual calculation went wrong. Results are shown with enough digits to round yourself; use the Rounding Calculator if you need a particular number of decimal places or significant figures.

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