▣ CALCULATORS Updated July 25, 2026

GCD and LCM Calculator

Greatest common divisor and least common multiple.

First number
Second number
Third number (optional)
Result
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How it works

The greatest common divisor uses the Euclidean algorithm, and the least common multiple follows from lcm(a,b) = a × b / gcd(a,b).

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Frequently asked questions

Is GCF the same as GCD?

Yes. Greatest common factor, highest common factor, and greatest common divisor all mean the same thing.

Can I use three numbers?

Yes. Leave the third box empty to work with just two.

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