How lcm calculator works
The least common multiple (LCM) of a set of integers is the smallest positive integer that is a multiple of every one of them. For 4 and 6 the multiples are 4,8,12,… and 6,12,18,…, so the LCM is 12. The LCM is the denominator you need when adding or subtracting fractions with different denominators.
This calculator uses the relationship LCM(a, b) = |a × b| / GCD(a, b), extended to more than two numbers by folding: LCM(a, b, c) = LCM(LCM(a, b), c). It accepts a list of integers or a comma- or space-separated string, ignores signs (using absolute values), and rejects zero because the LCM is undefined for zero.
Enter your numbers and click Calculate. The tool returns the LCM and the count of inputs. Use it for fraction arithmetic, scheduling recurring events (when two cycles next coincide), and number-theory homework.