Statistics & Probability calculators

Calculate arithmetic mean, median, sum, count, minimum, and maximum for a list of numbers.

Estimate a normal-theory confidence interval for a mean from a sample mean, deviation, and size.

Find the mean, median, mode, range, sum, and count of a list of numbers.

Convert a z statistic to left-tailed, right-tailed, and two-tailed normal-distribution p-values.

Calculate event probability, odds, complements, and independent two-event combinations.

Estimate a survey sample size from confidence level, margin of error, population, and expected proportion.

Calculate population and sample standard deviation, variance, mean, and count for a data set.

Summarize a data set with centre, spread, variance, standard deviation, and sorted values.

Standardize a value using a population mean and standard deviation, then estimate its percentile.