Factorial Calculator

Calculate the factorial n! for any non-negative integer, plus double factorial and multifactorial.

Number (n)

Factorial Type

Result
--

Scientific Notation

Number of Digits

How It Works

n! = 1 × 2 × 3 × ... × n. Double factorial n!! = n × (n-2) × (n-4) × ... (down to 1 or 2). Triple factorial n!!! = n × (n-3) × (n-6) × ... Large results are shown in scientific notation.

n! = n × (n-1) × (n-2) × ... × 2 × 1

About this Calculator

The Factorial Calculator is a free, easy-to-use tool for n!, double factorial, combinatorics. Simply enter your values and get instant, accurate results — no signup, no ads, no tracking. All calculations run locally in your browser, so your data stays completely private.

Privacy Note: All calculations are performed locally in your browser. No data is ever sent to a server or third party.