Calculate n! for a non-negative integer n up to 170.
| n! | – |
Use this calculator for n factorial: the product 1 × 2 × … × n, used in permutations, combinations, and counting. 0! is defined as 1. n is truncated to an integer; n must be ≥ 0.
IEEE double precision overflows after 170!, so n > 170 is rejected. The real extension Γ(n + 1) is not computed here.
n: A non-negative integer (0, 1, 2, …).
n!: The factorial of n.
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