Education & Math Tools
Factorial Calculator
Enter a non-negative integer to calculate its factorial exactly, using big-integer arithmetic.
10! = 3628800
Uses exact big-integer arithmetic, so results stay precise even for large n where a regular JavaScript number would lose precision (beyond roughly 170!).
How to use this tool
- 1Enter a non-negative integer.
- 2See the exact factorial result.
Frequently asked questions
Why use big-integer arithmetic?+
Regular JavaScript numbers lose precision above roughly 170! — big-integer (BigInt) math keeps the result exact no matter how large n is (up to a practical limit).