Factorial Calculator

Factorial Calculator: Calculate exact factorials for whole numbers from 0 through 300 using BigInt.

Factorial Calculator

Factorial Calculator: Enter a whole number from 0 through 300. The tool multiplies all positive integers up to that number and displays the exact result.

Loading the tool...

✓ Your inputs stay in this browser

How to use Factorial Calculator

Enter a whole number from 0 through 300. The tool multiplies all positive integers up to that number and displays the exact result.

How Factorial Calculator calculates the result

For a nonnegative integer n, n! is the product 1 × 2 × … × n, with 0! defined as 1. Use exact integer arithmetic because factorial values become extremely large.

Example

5! = 5 × 4 × 3 × 2 × 1 = 120. By convention, 0! = 1.

What to know

Factorials grow extremely quickly; this tool limits inputs to 300 to keep output manageable. It uses BigInt for exact integer results and does not accept fractions or negative numbers.