Binomial Probability Distribution Calculator

An online calculator to calculate the binomial probability distribution.

Probability Distribution

If in a given experiment the probability that event A occurs is p and the probability that it does not occur is 1 - p, then the probability that A occurs exactly k times in n trials is given by:

The calculator below calculates the binomial probability distribution P(k) from k=0 to k =n, for different values of n and the probability p. The applet below helps in investigating these distributions in various situations.

How to use the calculator

1 - Enter n and p and press "calculate". p must be a positive number smaller than or equal to 1. This calculator is limited to values of n equal to or smaller than 40.

n = 240
p = 01



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