Statistics Calculators

Paste a data set to get sample or population standard deviation, with the deviation table and every step of the working.

Compute sample or population variance from a pasted data set, with the sum-of-squares step table.

Find the mean, median, mode, range and sum from any pasted data set.

One data set in — count, centre, spread, quartiles, skewness, kurtosis and outliers out.

Five-number summary, IQR and outlier bounds with an explicit quartile method selector.

Find a percentile value from a data set, or the percentile rank of a score.

Build a stem-and-leaf plot from a pasted data set, with optional stem width.

Convert a raw score to a z-score, or look up normal-curve probabilities from z.

Convert a test statistic into a one- or two-tailed p-value for z, t, chi-square or F.

Build a confidence interval for a mean or proportion, using t when σ is unknown.

Find the sample size for a target margin of error, with optional finite-population correction.

Compute complements, intersections, unions, conditional probability and Bayes for two events.

Convert between probability and odds for or against an event.

Find the average (mean), plus median, mode, range and sum, from any pasted list of numbers.

Find the minimum, Q1, median, Q3 and maximum, plus IQR and outlier bounds, with an explicit quartile method selector.

Find the mean, median, mode and range together from any pasted data set, with the working shown for each.

One data set in, a full statistical summary out: count, centre, spread, quartiles, skewness, kurtosis and outliers.

Add a list of numbers and see the sum alongside count, mean, minimum and maximum from the same data set.