A factorial is simply a function that multiplies a given number by every number before it. The function is also used among other things, to find the number of ways ā€œnā€ number of objects can be arranged.

In mathematics, there are n! ways to arrange n objects in sequence. The n! (! = factorial) gives us the number of ways in which n objects can be permuted or combinated.

Instead of calculating a factorial one digit at a time, this calculator will calculate factorial n! for you, n being any number. If you enter an integer, up to 4 digits long, you will get the long integer answer and also the scientific notation for large factorials.