Math & statistics
calculators

Everyday arithmetic, algebra, probability, and descriptive statistics.

20 tools. Calculations run locally and every page explains its method.

  1. Math & statisticsPercentage CalculatorSolve common “what percent,” “percent of,” and “value from percentage” questions.
  2. Math & statisticsPercentage Increase / Decrease CalculatorMeasure percentage increase or decrease between an original and new value.
  3. Math & statisticsPercentage Difference CalculatorCompare two values symmetrically using their average as the reference.
  4. Math & statisticsFraction CalculatorAdd, subtract, multiply, or divide fractions and simplify the result.
  5. Math & statisticsRatio CalculatorSimplify ratios and scale a known ratio to a target total or term.
  6. Math & statisticsProbability CalculatorCalculate single-event, union, intersection, complement, and repeated-event probabilities.
  7. Math & statisticsAverage CalculatorCalculate the arithmetic mean and total for a list of numbers.
  8. Math & statisticsMean / Median / Mode CalculatorSummarise a data set using mean, median, modes, range, and count.
  9. Math & statisticsStandard Deviation CalculatorCalculate population or sample standard deviation and variance.
  10. Math & statisticsVariance CalculatorMeasure population or sample variance from a numerical data set.
  11. Math & statisticsStandard Error CalculatorCalculate the standard error of a mean from a sample deviation and sample size.
  12. Math & statisticsZ-Score CalculatorStandardise a value using a known mean and standard deviation.
  13. Math & statisticsPermutation & Combination CalculatorCount ordered permutations and unordered combinations for n objects chosen r at a time.
  14. Math & statisticsLCM & GCD CalculatorFind the least common multiple and greatest common divisor of integers.
  15. Math & statisticsScientific CalculatorEvaluate common trigonometric, exponential, logarithmic, and rounding operations safely.
  16. Math & statisticsExponent / Power CalculatorRaise a base to a positive, negative, fractional, or zero exponent.
  17. Math & statisticsSquare Root CalculatorCalculate principal square roots and identify perfect squares.
  18. Math & statisticsLogarithm CalculatorCalculate a logarithm using base 10, base e, base 2, or a custom positive base.
  19. Math & statisticsVolume CalculatorCalculate volume for boxes, cylinders, spheres, cones, and other common solids.
  20. Math & statisticsCubic Feet CalculatorConvert length, width, height, and quantity into cubic feet and cubic metres.