# Factorial of a Number Calculator

You are Here:

## Factorial of a Number

Factorial of a number n can be defined as product of all positive numbers less than or equal to n. For example, the factorial of 6 is 1 × 2 × 3 × 4 × 5 × 6 = 720

## Examples

The following table provides few examples of factorial of a number.

NumberFactorialResult
1!11
2!1 × 22
3!1 × 2 × 36
4!1 × 2 × 3 × 424

Note: In Mathematics, factorial of a number is represented by exclamation mark.

## Calculator

The following calculator will help you to find the factorial of any given number.

## Why does 0! = 1?

### We Know That

NumberFactorialResult
4!1 × 2 × 3 × 424
3!1 × 2 × 36
2!1 × 22
1!11

### Now turn this around

NumberCalculationResult
4!5! / 524
3!4! / 46
2!3! / 32
1!2! / 21
0!1! / 11

In this way a reasonable value for 0! can be found.

## Join Our Channel

Join our telegram channel to get an instant update on depreciation and new features on HTML, CSS, JavaScript, jQuery, Node.js, PHP and Python.

This channel is primarily useful for Full Stack Web Developer.