Factorial Calculator

n! = n × (n-1) × (n-2) × ... × 2 × 1. Used in combinatorics and probability.

What this calculator does

5! = 120. 10! = 3,628,800. 20! = 2,432,902,008,176,640,000.

Frequently asked questions

What is 10 factorial?

10! = 3,628,800.