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About This Tool
The Factorial Calculator computes n! (n factorial) — the product of all positive integers from 1 to n. Factorials grow extremely fast and are fundamental to combinatorics, probability, and algebra.
Factorials appear in permutation and combination formulas, Taylor series expansions, and many areas of discrete mathematics. This calculator handles values from 0! to 170! (the maximum before JavaScript reaches Infinity).
Enter a non-negative integer and instantly see the factorial value, the expanded multiplication, the number of digits in the result, and related values like n!/2 and log(n!).