Binomial Probability

Calculate exact binomial probabilities with n trials and success rate p. Fast, private, and built to make every number easier.

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How does this calculator work?

Calculate exact binomial probabilities with n trials and success rate p. Edit the inputs and see the computed results. All calculations take place inside your browser, without submitting values to a server.

P(X=k) = C(n,k)p^k(1−p)^(n−k).

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