Permutation and Combination Calculator

Calculate permutations and combinations

n (total items)

r (items to choose)

Written by the EachTools Team

Last updated: January 2026

How Permutations & Combinations Work

Permutations count arrangements where order matters. Combinations count selections where order doesn't matter.

Permutations: P(n,r) = n! / (n-r)!
Combinations: C(n,r) = n! / [r!(n-r)!]

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