EducationFree browser tool

Factorial Calculator – Calculate n! Online

Calculate factorial of any number. n! = n × (n-1) × ... × 1

No sign-upMobile readyPrivate by default
EDU

Tool

Enter your values and get results instantly.

HOW

How to Use

  1. 1Enter a number
  2. 2Click Calculate
  3. 3See factorial result
WIN

Benefits

Large number support
Scientific notation
Fast calculation
Free
Educational
FAQ

Frequently Asked Questions

What is a factorial?

A factorial (n!) is the product of all positive integers from 1 to n. Example: 5! = 5 × 4 × 3 × 2 × 1 = 120.

What is the largest factorial I can calculate?

Our tool supports numbers up to 170! which gives a result with over 300 digits. Beyond that, numbers exceed JavaScript's capacity.

What is 0 factorial?

By mathematical convention, 0! = 1. Our calculator correctly shows this result.

Where are factorials used?

Factorials are used in probability, permutations and combinations, statistics, and many areas of advanced mathematics.

Is this tool free for students?

Yes – completely free for students, teachers, and anyone learning mathematics.