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Statistics Calculators
Free statistics calculators: mean, median, mode, standard deviation, variance, z-score, probability, permutations and combinations with clear working.
Average CalculatorThe average (mean) of a list of numbers, with sum and count.Binomial Distribution CalculatorExact and cumulative binomial probabilities for n trials.Combination CalculatornCr — ways to choose r items from n when order does not matter.Confidence Interval CalculatorZ-based confidence interval for a mean.Correlation CalculatorPearson correlation coefficient r for paired data.Expected Value CalculatorExpected value, variance and standard deviation of a set of outcomes.Linear Regression CalculatorLine of best fit, r² and a prediction from paired data.Margin of Error CalculatorMargin of error of a survey percentage from its sample size.Mean, Median, Mode CalculatorMean, median, mode and range of a data set in one go.P-Value CalculatorP-value from a z-score — one-tailed or two-tailed.Permutation CalculatornPr — ordered arrangements of r items chosen from n.Point Estimate CalculatorBest single estimate of a proportion from successes and trials.Poisson Distribution CalculatorProbability of k events when the average rate is λ.Probability CalculatorCombine two independent events: both, either, neither, exactly one.Quartile CalculatorQ1, median, Q3, IQR and outlier fences for a data set.Sample Size CalculatorHow many responses a survey needs for a given margin of error.Standard Deviation CalculatorSample and population standard deviation, side by side.Variance CalculatorSample and population variance of a data set.Weighted Average CalculatorAverage where some values count more than others.Z-Score CalculatorZ-score from a value, or z and value from a percentile.