What is a factorial?
A factorial multiplies a number by all positive integers below it.
Factorial Calculator computes the factorial of a number using the standard mathematical definition. Factorials are widely used in combinatorics, probability theory, and algorithm design.
The factorial of a number n is calculated as the product of all positive integers from 1 to n. For example: 5! = 5 × 4 × 3 × 2 × 1.
A factorial multiplies a number by all positive integers below it.
n! = n × (n−1) × (n−2) × ... × 1.
0! equals 1 by mathematical definition.
They are essential in combinatorics and probability.
Yes factorial values grow extremely quickly.
In algorithms, permutations, and probability calculations.
Tool workspace
Calculate factorials instantly online. Compute n! values for mathematics, programming, and combinatorics.
Input
5
Output
120