Below is a factorial calculator, which will calculate the factorial of a number n. Enter a positive integer to return the factorial.
Factorial Calculator
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What is a Factorial?
A factorial is the product of a number and all positive integers that are less than that number.
It's a useful construct, found often when computing combinations and permutations of a set.
Formula for Factorials
The formula for a factorial is:
n! = 1 * 2 * 3 * ... * (n-2) * (n-1) * n
Example Factorial Calculation
For example, let's say you want to take the factorial of 7. Here's how it works:
7! = 1*2*3*4*5*6*7 = 5040
Using the Factorial Calculator
In the text box at the top, enter the Number n you'd like to compute the factorial for, then click the Compute Factorial button. We'll do the math and put the result in the Factorial box.
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