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mathClassic tool

LCM Calculator

Find the least common multiple of two or more integers and review the calculation steps.

Use this LCM calculator to find the least common multiple of two or more integers. It is helpful for fraction work, school math, repeating schedules, cycle matching and any situation where you need the smallest shared multiple.

How the calculation works

The least common multiple can be found by listing multiples or by using the relationship between the product and the GCD. This tool uses the step-by-step formula LCM(a, b) = |a × b| ÷ GCD(a, b) and repeats it until every value in the list has been included.

When to use an LCM calculator

The result helps with adding fractions that have different denominators, syncing recurring events, solving divisibility exercises and comparing periods. The calculator also shows the GCD of the set, the normalized values and helpful notes when zero or negative numbers appear in the input.

Separate values with commas, spaces or line breaks. Positive and negative integers are accepted.

SummaryEnter two or more integers to calculate the LCM.
Least common multiple—
Set GCD—
Number of values—
Values used—
NotesThe tool uses absolute values and applies the link between LCM and GCD.
Calculation steps
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Use clear inputs to get a more useful result.