Free & Instant
LCM Calculator
Find the Least Common Multiple of two or more numbers instantly.
LCM Calculator
Calculate the least common multiple instantly.
Separate numbers with commas
Least Common Multiple
0What is LCM?
The Least Common Multiple (LCM) is the smallest positive number that is a multiple of all the given numbers — meaning all the numbers divide evenly into it.
LCM Formula
LCM(a, b) = (a × b) / GCD(a, b)
Example: LCM(4, 6) = 12
Frequently Asked Questions
Where is LCM commonly used?
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LCM is essential for adding or subtracting fractions with different denominators, and for solving problems involving repeating cycles or schedules.
Can I find the LCM of more than two numbers?
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Yes, enter all numbers separated by commas, and the calculator computes the LCM across the entire set.
How is LCM related to GCD?
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They're related through the formula LCM(a,b) × GCD(a,b) = a × b — knowing one helps calculate the other for any pair of numbers.