Math
Factorial Calculator
Calculate the factorial of any non-negative integer n. Shows exact results for n! up to 170.
10! =
3628800
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Frequently Asked Questions
Quick answers to common questions
What is a factorial?+
n! (n factorial) is the product of all positive integers from 1 to n. By definition, 0! = 1.
What is the largest n supported?+
This calculator supports n from 0 to 170. Beyond 170, factorials exceed JavaScript number limits.
Why is 0! equal to 1?+
It is a mathematical convention that makes combinatorics formulas work correctly. 0! = 1 by definition.
Is my input private?+
Yes. All computation happens in your browser.