What is a factorial?
A factorial multiplies a number by all positive integers below it.
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Calculate factorials instantly online. Compute n! values for mathematics, programming, and combinatorics.
Factorial Calculator computes the factorial of a number using the standard mathematical definition. Factorials are widely used in combinatorics, probability theory, and algorithm design.
Input
5
Output
120
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.