Free online statistics calculators
Statistics calculators for probability, distributions, and more.
Calculate common statistics problems in your browser. Get the answer, formula, working, and an explanation you can use for study and homework.
Calculator library
Probability distribution calculators
Probability distributions
Binomial Distribution Calculator
Exact, cumulative, tail, range and inverse binomial probabilities with mean, variance, table and steps.
Open calculator →Probability distributionsNormal Distribution Calculator
Z-scores, left and right tails, between-values, outside ranges and inverse percentiles.
Open calculator →Probability distributionsPoisson Distribution Calculator
Exact, cumulative, tail, range and no-event probabilities with interval rate scaling.
Open calculator →How StatCalc works
More than a number.
Our calculators show the inputs, formula, probability, supporting statistics, and step-by-step reasoning so you can understand how the result was obtained.
Use the probability distribution pages together to compare binomial, normal, and Poisson models and choose the one that matches your problem.