Factorial Calculator
Calculate the factorial of any non-negative integer (n!).
How to use this tool
- Enter n in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your n! and the full breakdown beneath it.
Calculate the factorial of any non-negative integer. For example, 5! = 5 × 4 × 3 × 2 × 1 = 120.
Frequently asked questions
- What is a factorial?
- The factorial of n (written n!) is the product of all positive integers up to n. By definition, 0! = 1.