How it works
The least common multiple is the smallest positive number divisible by both inputs. The calculator uses the greatest common divisor relationship to compute it efficiently.
Standard formula
LCM(a, b) = |a × b| ÷ GCD(a, b)Worked example
The LCM of 12 and 18 is 36 because 36 is the first positive multiple shared by both numbers.
Frequently Asked Questions
What is a multiple?
A multiple is a number produced by multiplying an integer by another whole number.
Is LCM the same as GCD?
No. LCM finds a shared multiple; GCD finds the largest shared divisor.
Can I use negative integers?
This page accepts positive whole numbers so the result is unambiguous and useful for common multiples.
What happens with equal inputs?
The LCM is that number itself.