Permutation & Combination Calculator

Calculate permutations P(n,r) and combinations C(n,r) for given n and r values.

n (Total items)

r (Items selected)

Permutations P(n,r)

Combinations C(n,r)

n! (n Factorial)

r! (r Factorial)

How It Works

Permutations count ordered arrangements where order matters. Combinations count unordered selections where order doesn't matter. n must be greater than or equal to r, and both must be non-negative integers.

P(n,r) = n!/(n−r)! | C(n,r) = n!/(r!(n−r)!)

About this Calculator

The Permutation & Combination Calculator is a free, easy-to-use tool for permutation, combination, factorial. Simply enter your values and get instant, accurate results — no signup, no ads, no tracking. All calculations run locally in your browser, so your data stays completely private.

Privacy Note: All calculations are performed locally in your browser. No data is ever sent to a server or third party.