Factorial Calculator

Factorial Calculator

Number to find factorial of:
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Factorial Formula:

Factorial of n = The product of all positive integers less than or equal to n

Factorial Definition

The Factorial Calculator makes it easy to find the factorial of a number. Enter in the number that you want to find the factorial for and then press the calculate button. The definition of a factorial practically speaking is any number multiplied by every real positive whole number less than itself. For example, 4! (the “!” represents the mathematical notation for factorial) would be 4 * 3 * 2 * 1 = 24 and 5! would be 5 * 4 * 3 * 2 * 1 = 120.

How to Calculate Factorial

Let's be honest - sometimes the best factorial calculator is the one that is easy to use and doesn't require us to even know what the factorial formula is in the first place! But if you want to know the exact formula for calculating factorial then please check out the "Formula" box above.

Add a Free Factorial Calculator Widget to Your Site!

You can get a free online factorial calculator for your website and you don't even have to download the factorial calculator - you can just copy and paste! The factorial calculator exactly as you see it above is 100% free for you to use. If you want to customize the colors, size, and more to better fit your site, then pricing starts at just $29.99 for a one time purchase. Click the "Customize" button above to learn more!