Factorial Calculator - Calculator See


Factorial Calculator

Calculate factorials n! for positive integers and gamma function approximations for fractional numbers.

Calculator Inputs

Enter positive whole number n.

Calculated Results

Factorial n!
3,628,800 (10!)
Trailing Zeros 2 Zeros
Scientific Notation 3.6288e+6
Number of Digits 7 Digits
Values calculate live as you adjust inputs.

About Factorial Calculator

Computes the product of all positive integers less than or equal to n, denoted as n!.

What is Factorial Calculator?

Computes the product of all positive integers less than or equal to n, denoted as n!.

How to Use This Calculator

  1. Enter a positive integer n.
  2. View exact factorial product and trailing zero count.

The Mathematical Formula & Variables

n! = n * (n - 1) * ... * 1; 0! = 1 by mathematical definition

Step-by-Step Worked Example

Scenario: Find 6!.

  1. 6 * 5 * 4 * 3 * 2 * 1 = 720.

Result: 720

Frequently Asked Questions

Why does 0! equal 1?

There is exactly 1 way to arrange an empty set of 0 items. It also preserves the recurrence relation (n - 1)! = n! / n.