Factorial Calculator
Compute n! for integers up to 170 with exact output
Use this when you need a fast, accurate result — no sign-up, works entirely in your browser.
n!—
Computed by multiplication—
How to Use
- Enter your details into the fields above.
- Click the calculate button to get your result instantly.
- Use the clear button to start a new calculation.
Example
- n = 8 → 8! = 40,320
- 10! → 10! = 3,628,800
Formula
n! = n × (n−1) × (n−2) × … × 2 × 1. 0! = 1 by convention. Capped at n = 170 to avoid floating-point overflow (JS Number.MAX_SAFE_INTEGER territory). For larger n the tool reports the approximate decimal-digit count instead.
About Factorial Calculator
Compute n! for integers up to 170 with exact output. This free online tool gives you fast, accurate results without registration or downloads.
Everything runs locally in your browser, so your data is never uploaded or stored — privacy first.
Frequently Asked Questions
Is this tool free to use? +
Yes, it is completely free with no registration or download required.
Is my data private? +
Yes. Everything is processed locally in your browser. Nothing is uploaded or stored on our servers.
Does it work on mobile? +
Yes, it works on any device — phone, tablet, or desktop.