# Factorial of Positive Number Calculator

getcalc.com's **Factorial (n!) Calculator** is an online basic math function tool to calculate factorial of a positive number or integer n.

## Definition and Formula

**Factorial** is a basic mathematic function often represented by **n!** in mathematics, represents the product of all integers less than or equal to the positive integer n. An important function frequently used in combinatorics (*permutations* and *combinations*) theory.

For example, 6! can be written as

6! = 1 x 2 x 3 x 4 x 5 x 6

6! = 720