Factorial Calculator (n!)
Compute the factorial of a whole number (n!), up to 170.
Result
Factorial (n!)
120
How it works
n! = n × (n−1) × … × 2 × 1
The factorial of n is the product of all whole numbers from 1 to n. By definition 0! = 1. Example: 5! = 5×4×3×2×1 = 120.
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Frequently asked questions
What is 5 factorial?
5! = 120.
What is 0 factorial?
0! = 1, by definition.
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