Overview
What Is LCM?
The Least Common Multiple (LCM) is the smallest positive number that is a multiple of every number in a set.
Find the least common multiple of any set of numbers.
The Least Common Multiple (LCM) is the smallest positive number that is a multiple of every number in a set.
Useful for finding common denominators, scheduling recurring events, and number theory problems.
Type numbers separated by commas.
The result updates automatically.
Finding common denominators for fractions, scheduling recurring events, and solving divisibility problems.
LCM = (a × b) ÷ GCF(a, b) for two numbers, extended similarly for more numbers.
The LCM of a number and itself is that number.
Yes, this calculator supports any number of values.
LCM is the smallest common multiple; GCF is the largest common factor - opposite concepts.
Yes, unless one number is a multiple of the other, LCM is always greater than or equal to the largest input.
Yes, enter as many comma-separated numbers as needed.
No, LCM is defined only for positive integers and is always positive.
Yes, the LCM of two denominators gives you the least common denominator needed for addition.
Yes, completely free with no sign-up required.