Statistics Calculators

Choose the right calculator

Explore data summaries, probability, and combinations.

Median Calculator

Find the median, mean, quartiles, range, and an optional percentile. Choose the quantile convention.

Standard Deviation Calculator

Calculate population or sample variance and standard deviation from entered values.

Combination Calculator

Calculate factorials, permutations, combinations, combinations with repetition, and multiset permutations.

Z Score Calculator

Calculate density, tail or interval probability, a quantile, or a Z score for a normal distribution.

Probability Calculator

Calculate complement, union, independent intersection, conditional, total, or Bayes probabilities.

Binomial Probability Calculator

Calculate binomial probabilities, cumulative tails, intervals, or quantiles.

Confidence Interval Calculator

Calculate Z mean, Student t mean, or Wilson proportion intervals with the selected confidence level.

Sample Size Calculator

Estimate sample size for a mean or proportion from confidence level, margin of error, and optional population size.

Correlation Calculator

Calculate Pearson correlation, population and sample covariance, and a fitted slope.

Poisson Distribution Calculator

Calculate Poisson, exponential, or continuous uniform probabilities using the available modes.