How many numbers can I enter?

As many as you like, separated by commas, spaces, or new lines.

What algorithm is used?

The Euclidean algorithm for GCD, then LCM is derived from the GCD of each pair.

Are negative numbers supported?

Their absolute value is used automatically.

Is my data uploaded to a server?

No. This tool runs entirely in your browser using standard web APIs, so your input never leaves your device and nothing is logged or stored on our servers.

Does it work offline and on mobile?

Yes. Once the page has loaded it keeps working without a network connection, and the layout is responsive so it stays usable on phones and tablets.

GCD & LCM Calculator

Find the greatest common divisor and least common multiple of numbers.

Support

Works Offline

Privacy First

No Login

No API

Numbers

Enter two or more positive integers

Results

GCD

LCM

360

About the GCD & LCM Calculator

Enter two or more positive integers to instantly compute their greatest common divisor (GCD) and least common multiple (LCM) using the Euclidean algorithm.

Examples

GCD/LCM of 24, 36, 60

24, 36, 60

Output

GCD: 12, LCM: 360

Keyboard shortcuts

Copy the main outputCtrl / ⌘ + Shift + C
Download the resultCtrl / ⌘ + S
Share this toolCtrl / ⌘ + Shift + S
Reset the inputsAlt + R
Open the tool search paletteCtrl / ⌘ + K

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Frequently asked questions

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Version 1.0.0 · Updated 2026-08-07 · Runs entirely in your browser