Statistics and Probability Calculators
Statistics calculators summarise and test data. Find the mean and standard deviation of a list, the quartiles and outliers, the correlation between two sets of numbers, or the probability of an outcome.
Paste your numbers in a list and the results update as you type, with notes on which formula is used, for example sample or population standard deviation.
Standard Deviation CalculatorFind the standard deviation and variance of a list of numbers, for a sample or a whole population, with the working.Quartile CalculatorFind the quartiles, median, interquartile range and outliers of a list of numbers, using the method your course or spreadsheet uses.Permutation and Combination CalculatorWork out nPr and nCr exactly, with and without repeats, for choosing r items from n.Binomial Probability CalculatorFind the chance of exactly, at most or at least k successes in n trials, with the mean and standard deviation.Confidence Interval CalculatorFind the confidence interval for a mean from a sample, or for a proportion, with the margin of error.Sample Size CalculatorWork out how many people to survey for a proportion, or how many measurements for a mean, for the margin of error you want.Weighted Average CalculatorFind the weighted average of values that count for different amounts, such as grades with different weightings.Probability CalculatorWork out the chance of two events happening together or either happening, for independent, exclusive and dependent events, and repeated trials.Normal Distribution and Z-Score CalculatorFind z-scores, the probability of a value being below, above or between limits in a normal distribution, or the value for a given probability.Linear Regression and Correlation CalculatorFit a straight line to pairs of values and get the slope, intercept, correlation coefficient, r squared and a prediction.Average CalculatorFind the mean, median, mode, range, sum, count and standard deviation of a list of numbers.
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