Factorial Calculator
Exact n factorial for any integer.
Enter the values and press Calculate.
How to use Factorial Calculator
The factorial of n is the product of every integer from 1 to n. This tool computes it exactly, even for large n.
Open Factorial Calculator on toolpermarket. It runs entirely in your browser, so you can start without creating an account.
Enter the integer n in the fields above, then press Calculate.
Read the result below the form. Change any input and run it again as many times as you like — the math is instant and local.
Worked example. 5 factorial is 5 times 4 times 3 times 2 times 1, which equals 120.
When to use Factorial Calculator. Use it in combinatorics, probability, or anywhere a product of a sequence is needed.
Frequently asked questions
Is Factorial Calculator free to use?
Yes. Factorial Calculator runs entirely in your browser. There is no account, no upload, and no cost.
Does Factorial Calculator work on mobile?
Yes. The layout is responsive, so Factorial Calculator works on any phone, tablet, or desktop with a modern browser.
What is 0 factorial?
By definition 0 factorial equals 1. The tool returns 1, which keeps formulas like combinations working.
How large an n can it handle?
It uses exact integer arithmetic, so it stays precise for far larger values than a normal calculator shows.