Math calculator
Factorial Calculator
Calculate n factorial for whole numbers up to 170.
Formula
Factorial
n! = n x (n - 1) x ... x 1
8! equals 40,320.
FAQs
What is 0 factorial?+
0! is defined as 1.
Why is input capped?+
Factorials grow extremely quickly, so the calculator caps inputs at 170.
How does the Factorial Calculator calculate the result?+
It uses the Factorial: n! = n x (n - 1) x ... x 1. 8! equals 40,320.
What information do I need to use the Factorial Calculator?+
Calculate n factorial for whole numbers up to 170.
How accurate is the Factorial Calculator?+
Factorial Calculator applies the formula and assumptions shown on this page. Results may be rounded for readability, so verify changing rates, thresholds, medical guidance, or legal rules with the cited source or a qualified professional.
What should I check before using the Factorial Calculator result?+
Check that the units, dates, rates, and assumptions match your situation. Change one input at a time to understand which values have the largest effect on the result.
Math guide
How to use the Factorial Calculator
Calculate n factorial for whole numbers up to 170. The page also explains the factorial and shows a practical example: 8! equals 40,320.
- 1
Enter your details
Enter the values for the factorial calculator scenario you want to check.
- 2
Check the calculation
Review the result alongside the factorial: n! = n x (n - 1) x ... x 1.
- 3
Compare scenarios
Change one or more inputs to see how they affect the factorial Calculator result before you use the estimate.
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