This factorial calculator helps you calculate any factorial operation which is a function that makes the product of all positive integers less than or equal to a given number. More details on this topic you can read below the form.

## How does this factorial calculator work?

This factorial calculator might come in handy whenever you need to solve a math problem or exercise that requires any of the following 5 factorial calculations:

■ Simple operation which takes account of a single given value and applies the standard factorial formula: **n! = 1*2*3…*n**;

■ Adding, subtracting, dividing or multiplying 2 factorials which is computed by using the same factorial equation for both values and then add OR subtract OR divide OR multiply by case the two numbers obtained.

## What is factorial?

In mathematics a factorial is a function that makes the product of all positive integers less than or equal to a desired number (n).

The notation for this function is !, as for instance when we say we need to find the value behind 4 factorial it should be written such 4! and is equal to 1*2*3*4 = 24.

This function is most often used in calculating the number of ways an object can be positioned in a sequence (see concepts such as permutations and combinations).

Please take account of the fact that 0! is equal to 1 as there is only one way to permute 0 objects.

08 Apr, 2015