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Factorial Calculator

Free factorial calculator to calculate factorial. Instant results in your browser — no signup.

Also known as: Calculate factorial, factorial calculator, n factorial, calculate factorial calculator, calculate factorial, probability math, probability calculate factorial

Direct calculator

Inputs

Results update when you click Calculate.

8!

40,320

8! = 8 × 7 × … × 1

  • Scientific4.0320e+4
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Recently used

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What this result means

Free factorial calculator to calculate factorial. Instant results in your browser — no signup. n! = n × (n−1) × … × 1, with 0! = 1.

Assumptions

  • Rule dependency: Universal formula.

How is it calculated?

n! = n × (n−1) × … × 1, with 0! = 1.

Example

8! = 40,320.

Frequently asked questions

Max n?+

Capped at 170 before floating-point overflow.