Binomial Distribution Calculator

The binomial distribution models the number of successes in n independent trials.

What this calculator does

P(X=k) = C(n,k) × pᵏ × (1−p)^(n−k).

How it works

Mean = n×p. Variance = n×p×(1−p).

Frequently asked questions

What is binomial probability?

It's the probability of getting exactly k successes in n trials, each with probability p.