Math
GCD & LCM Calculator
Greatest common divisor and least common multiple of two integers.
Inputs
GCD & LCM Calculator
Result
GCD
12
- LCM
- 72
GCD and LCM in one place
GCD (greatest common divisor) is the largest integer dividing both numbers; LCM (least common multiple) is the smallest integer both divide into. They're related: GCD(a,b) × LCM(a,b) = a × b.
Where they help
Reducing fractions to lowest terms uses GCD — see the Fraction Calculator; adding fractions with unlike denominators uses LCM.