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Statistics calculators

Describe your data and work with probability: averages, spread, z-scores, confidence intervals, sample size, permutations and combinations.

Statistics and Mean, Median, Mode & Range both summarise a data set — Statistics gives the fuller picture (quartiles, variance, standard deviation and more), while Mean, Median, Mode & Range sticks to the four most commonly asked-for numbers. Standard Deviation is for when that one figure is all you need, shown both as a sample and a population statistic.

Z-Score and Confidence Interval both use the normal distribution — Z-Score for where a single value sits, Confidence Interval for a range around a sample mean or proportion. Sample Size is for planning a survey before you collect data, and Probability and Permutation and Combination are for working out chances and counting arrangements rather than summarising existing data.

Random Number GeneratorRandom numbers in any range, with or without repeatsStandard Deviation CalculatorSample or population SD, variance and meanNumber Sequence CalculatorArithmetic, geometric and Fibonacci sequencesSample Size CalculatorSurvey size for your confidence level and margin of errorProbability CalculatorOne event, two events or repeated trialsStatistics CalculatorMean, median, mode, spread and quartiles in one placeMean, Median, Mode & Range CalculatorAverage, middle value, most common value and spreadPermutation and Combination CalculatornPr and nCr: arrangements and selectionsZ-Score Calculatorz-score, percentile and normal-curve probabilitiesConfidence Interval CalculatorConfidence interval for a mean or a proportion