Factorial Calculator

Calculate n factorial for any whole number up to 170.

Quick answer: Factorial Calculator: Calculate n factorial for any whole number up to 170. Everything runs in your browser, so nothing you enter is uploaded or stored.

How to use Factorial Calculator

Enter your values in the fields.
The results update instantly as you type.
Note or copy the numbers you need.

Features

Instant results
Free, no signup
Runs in your browser, nothing is uploaded
Works on phone and desktop

Formula

n! = n x (n-1) x ... x 1.

Worked example

5! = 120 and 10! = 3,628,800.

Frequently asked questions

What is a factorial?

The product of all whole numbers from 1 to n.

What is 0 factorial?

1 by definition.

Is the Factorial Calculator free?

Yes. It is free, needs no signup and works on any device.