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GCD and LCM calculator

Find the greatest common divisor and least common multiple of two or more whole numbers, of any size.

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Whole numbers separated by commas or spaces

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Find the greatest common divisor and least common multiple of two or more whole numbers, of any size.

Euclid: gcd(a, b) = gcd(b, a mod b); lcm(a, b) = |a × b| ÷ gcd(a, b)

Whole numbers separated by commas or spaces: 84, 126, 210

→ Greatest common divisor (GCD): 42
→ Least common multiple (LCM): 1,260
→ Coprime: No

Basic release. Review the result before relying on it. File limits, supported cases and processing requirements are shown above.

Content updated: 2026-10-10

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Your inputs stay in this tab. We do not receive your files, pasted text or calculation values.

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