Calculate event probabilities, count arrangements, update conditional probabilities and explore common probability distributions.
Which calculator should I use?
Use general probability for event combinations, counting for permutations or combinations, and Bayes for conditional information. Select a distribution only after checking whether its assumptions match your process. Random generation can support examples and simulations.
Available calculators
Random Number and List Generator
Produce reproducible pseudorandom draws, shuffles, dice and coin flips.
General Probability Calculator
Calculate complements, unions, conditional intersections, binomial events and odds.
Permutation and Combination Calculator
Count selections with order and repetition rules, including multinomial arrangements.
Probability Distribution Calculator
Find densities, cumulative and interval probabilities, and quantiles for six common distributions.
Conditional Probability and Bayes Calculator
Convert prior and likelihoods to posterior probability with a natural-frequency table.