Greatest Common Divisor (GCD) & Least Common Multiplier (LCM)

This calculator calculates both the greatest common factor, known as the GCF, and also the least common multiple, or LCM of either two (2) or three (3) numbers.

The greatest common factor, which is the largest common, factor between the values in question. The GCF is usually solved by mental math. It can also be solved algebraically using the Euclidean Algorithm.

Then the least common multiple is found by:

LCM = A * B / GCF

Where:

• A = First Value
• B = Second Value
• LCM = Least Common Multiple
• GCF = Greatest Common Factor

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