Calculator categories

Statistics

Mean, variance, p-value, confidence interval. 2 free calculators with the formula, worked examples, and FAQ on every page. All math runs in your browser — nothing is sent to a server.

Mean, median, mode calculator

Central-tendency stats from a list of numbers — plus count, sum, min, max, range

Standard deviation calculator

Sample (n−1) and population (n) standard deviation + variance from a list