Factorial Calculator

What is Factorial Calculator?

A factorial calculator computes n! (n factorial) — the product of all positive integers up to n. Factorials appear in combinatorics, probability, and statistics. This tool handles large numbers instantly and shows step-by-step multiplication.

How to use

1. Enter a non-negative integer (0–170 supported without overflow).
2. View the factorial result and the expanded multiplication expression.
3. Copy the result or download a table of factorials for a range of values.

Result

Enter 12 to get 479,001,600. The tool shows 12 × 11 × 10 × … × 1 = 479,001,600, useful for calculating permutations of 12 items.

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