GCF Calculator
Find the greatest common factor (GCF, also called GCD or HCF) of two or more integers — plus their least common multiple.
Inputs explained
- Numbers (comma-separated integers) — Two or more non-zero integers separated by commas, e.g. 12, 18, 24.
How to use it
- Fill in the fields above — each input has a hint describing exactly what to enter
- Press Calculate to get your result instantly, right on this page
- Copy the result, save the tool to favorites, or share and embed it anywhere
Understanding the result
Example: For 12, 18, 24 the GCF is 6 and the LCM is 72.
Frequently asked questions
How are GCF and LCM related to each other? For two numbers, GCF × LCM equals the product of the two numbers, which is why the calculator can report both from the same input — for 12 and 18, for example, 6 × 36 = 216 = 12 × 18.
Is GCF the same thing as GCD or HCF? Yes — greatest common factor, greatest common divisor, and highest common factor are three names for the identical calculation; different textbooks and regions just use different terminology.
Is the GCF Calculator free to use? Yes — it is completely free, with no sign-up, no download and no usage limits. You can use it as often as you need.
Is my data private? Yes. The calculation runs entirely in your browser — the values you enter are never sent to our servers, stored or shared with anyone.
What information do I need? Just the following: Numbers (comma-separated integers). Each field includes a hint explaining exactly what to enter.
Can I use it on my phone? Yes — the tool is fully responsive and works on any device, and the same calculator is available in the EasyWorkCalcs mobile app.
Privacy
Everything you enter into the GCF Calculator is processed entirely in your browser. Nothing is uploaded, stored or shared — your data stays on your device.