Factorial Calculator
Enter a non-negative integer to calculate n! exactly. The result is computed locally with BigInt.
A QUICK WALKTHROUGH
How to use this tool
- Enter an integer from 0 through 1000.
- Choose Calculate.
- Read the exact result and digit count.
Integer and size limits
Only whole numbers from 0 through 1000 are accepted. The limit keeps the output and browser work bounded.
Exact BigInt arithmetic
The calculation uses JavaScript BigInt, so the displayed integer is exact rather than a rounded floating-point value. BigInt notation is disclosed in the result.
GOOD TO KNOW
Common questions
What is 0!?
0! equals 1 by definition.
Are decimals or negative values accepted?
No. Enter a non-negative integer from 0 through 1000.
Is the result exact?
Yes. BigInt arithmetic is used locally and the full integer is shown.