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GCF & LCM Calculator

Files stay on your device · 100% private Runs in your browser

Greatest common factor and least common multiple of two to six numbers, with prime factors.

How it works: GCF is the largest number that divides all your inputs; LCM is the smallest number they all divide into evenly. Both fall straight out of the prime factorizations shown with the result.
Enter at least two whole numbers.

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How to Use GCF & LCM Calculator

1

Select or Upload

Choose your file or paste your input into the workspace above. Drag and drop is supported.

2

Configure & Process

Adjust options to fit your task. Processing runs immediately with no waiting queue.

3

Download Result

Preview and save your output in one click with no watermarks or sign-up prompts.

Private & Confidential

Browser tools process files locally on your device, and server temporary files are deleted automatically within 15 minutes.

Free & No Registration

Full access to every utility without creating an account, signing in, or hitting paywalls.

Works on Any Device

Responsive layout that runs smoothly on desktop, tablet, and mobile browsers across all operating systems.

Frequently Asked Questions

Is GCF & LCM Calculator completely free to use?

Yes, GCF & LCM Calculator on KiloToolbox is 100% free with no limits, hidden fees, or account sign-up required.

Are my files safe and private?

Yes. GCF & LCM Calculator processes all files directly inside your web browser using client-side JavaScript and WebAssembly. Your files never leave your computer or mobile device and are never uploaded to any remote server.

Can I use GCF & LCM Calculator on mobile phones and tablets?

Yes, KiloToolbox is fully responsive and runs smoothly on iPhone, Android, iPad, Mac, Windows, and Linux.