Factorial
Math
n!3628800
About the Factorial calculator
Use this free Factorial calculator. Enter n and it shows n! instantly. With the default values, the n! comes to 3628800.
How the Factorial calculation works
n! = n × (n−1) × … × 1, and 0! = 1. It counts the ways to arrange n items.
Tip: Factorials grow extremely fast: 20! is already over 2 quintillion.
Frequently asked questions
What does the Factorial calculator do?
It takes n and instantly calculates n!.
Is the Factorial calculator free?
Yes. It is free, needs no signup and runs in your browser, so your numbers are not stored.
Which currency does it use?
Amounts are plain numbers, so use any currency consistently.
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