Factorial Calculator

Product of Whole Numbers

Factorial multiplies a whole number by every positive whole number below it.

Rule: n! = n x (n-1) x ... x 1, and 0! = 1.

Understanding Factorials

1. What This Calculator Measures

A factorial multiplies a non-negative whole number by every positive whole number below it.

2. How the Calculation Works

The calculator validates whole-number input and uses exact BigInt multiplication for values up to 500.

3. Formula or Rule Used

n! = n x (n-1) x ... x 1; 0! = 1.

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