Factorial Calculator

Use this page when you want the value of n! itself and want to see the multiplication that defines factorial.

Enter the non-negative whole number in n!.

Result

Enter values to calculate.

What your result means

The explanation updates with the current inputs.

Calculation work

When to use this

Use this formula when the question matches this rule set

Evaluating factorial notation, simplifying formulas, and checking the product that appears inside combinations and permutations.

What this result means

n! means multiply every whole number from n down to 1. For example, 5! = 5 × 4 × 3 × 2 × 1 = 120.

Formula: n!

Calculator inputs

This page uses one field because factorial only needs the number in n!.

This is the non-negative whole number in the factorial expression.

What to enter: Enter the whole number from n!.

How to use it: Use 0 or any positive whole number. The calculator expands it as n × (n-1) × ... × 1.

Example: For 7!, enter 7.

Worked examples

Expand 7! as 7 × 6 × 5 × 4 × 3 × 2 × 1.

7! is 5,040.

Expand 5! as 5 × 4 × 3 × 2 × 1.

5! is 120.