LCM & GCD Calculator

Find the least common multiple and greatest common divisor of two integers.

First number

Second number

LCM (least common multiple)

Last updated: 2026-08-30

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FAQ

What is the LCM used for?

Adding fractions with different denominators and scheduling repeating events — the LCM is the first time cycles align.

How are LCM and GCD related?

For any two positive integers, LCM × GCD equals the product of the numbers, so one determines the other.

Which algorithm finds the GCD?

The Euclidean algorithm: repeatedly replace the pair with (smaller, remainder) until the remainder is zero.

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