GCD & LCM Calculator

Find greatest common divisor and least common multiple

Number 1

Number 2

GCD

LCM

Enter two numbers to find their greatest common divisor (GCD) and least common multiple (LCM).

GCD = largest divisor of both numbers; LCM = (a × b) / GCD

Example: GCD(12, 18) = 6, LCM(12, 18) = 36