4 calculators live

Statistics Calculators

Averages, spread, probability and distributions.

Standard Deviation Population and sample standard deviation, variance, and z-scores. 1 input Open → Mean, Median, Mode Mean, median, mode, midrange and quartiles from any list of numbers. 1 input Open → Probability Combine two event probabilities, or count combinations and permutations. 2 inputs Open → Sample Size How many responses you need, by confidence level and margin of error. 3 inputs Open →