➗ Factorial Calculator
Calculate n factorial for a nonnegative integer.
Result
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How this calculator works
Calculate n factorial for a nonnegative integer.
Formula
n!=n(n-1)...1
Example
8! = 40,320.
Frequently asked questions
What does the Factorial Calculator do?
Calculate n factorial for a nonnegative integer.
Are the results exact?
The calculator follows the displayed formula. Rounded display values may differ slightly from full-precision results.
Can I use negative or decimal values?
Most fields accept decimals and negative values when they make sense for the formula.
How should I check an important result?
Review the formula, verify your entries, and confirm high-stakes work with a qualified teacher or professional.