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GCD and LCM calculator
Greatest common divisor and least common multiple of two or more numbers.
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- No sign-up
- Works on any device
About GCD and LCM calculator
Finds the greatest common divisor and least common multiple for two or more whole numbers. The GCD simplifies fractions, and the LCM gives common denominators and repeating schedules. The two are linked for a pair: GCD x LCM = a x b, a handy way to check your work.
How to use GCD and LCM calculator
- Enter your numbers above.
- The result updates instantly as you type.
- Change any value to compare different cases.
Why use this tool?
- Private: everything happens in your browser. Nothing you enter is uploaded.
- Free, with no sign-up, no watermark and no limit on how often you use it.
- Works on phones, tablets and computers: Android, iPhone, Windows, Mac and Linux. Nothing to install.
- Available in 10 languages.
Also known as
Frequently asked questions
What is the GCD of 24 and 36?
It is 12, the largest number dividing both evenly. The matching LCM is 72, and indeed 12 x 72 equals 24 x 36, which is 864.
Is GCD and LCM calculator free?
Yes. GCD and LCM calculator on Toolipedia is free to use, with no sign-up and no watermark.
Is it safe to use?
Yes. Everything is worked out in your browser, and nothing you enter is sent to our server.
Does it work on my phone?
Yes. It works in any modern browser on Android and iPhone, as well as on tablets and computers. There's nothing to install.
Do I need an account?
No. Just open the page and use the tool. There's no sign-up and no email needed.