What is the Binomial Probability Calculator?
Use it when you repeat the same yes/no trial n times with success chance p – coin tosses, defect checks, exam guesses. Enter n, p and k to get the probability of exactly k successes, at most k, at least k, plus the mean, variance and a bar chart of the whole distribution.
How to use the Binomial Probability Calculator
- Enter the number of trials n.
- Enter the probability of success p (0 to 1).
- Enter the number of successes k.
What is the formula?
P(X = k) = C(n, k) × pᵏ × (1 - p)ⁿ⁻ᵏ.
This Binomial Probability Calculator is 100% free, needs no signup and runs privately in your browser – on phone, tablet or computer.
Last updated: · By NodifyTech