GCF Calculator
Greatest common factor of two or more numbers
Use this when you need a fast, accurate result — no sign-up, works entirely in your browser.
Greatest common factor—
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
- 48, 180 → GCF = 12
- 84, 126 → GCF = 42
Formula
The greatest common factor is the largest integer that divides every number. It is found with Euclid's algorithm: GCF(a, b) = GCF(b, a mod b) until the remainder is 0.
About GCF Calculator
Greatest common factor of two or more numbers. 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.