LCM Calculator

Find the least common multiple (and greatest common factor) of a list of numbers. Enter them separated by commas.

LCM
—
Least common multiple.

Usage Tip

The LCM grows fast with more or larger numbers; the GCF stays small. Use LCM for common denominators, GCF for reducing.

THE MATH
LCM of two numbers = product ÷ their GCF
Extended across the whole list
The least common multiple is the smallest number that every value divides into evenly.
It is the least common denominator when adding fractions.
Enter two or more positive whole numbers separated by commas.
Non-integer or non-positive entries are ignored.
The greatest common factor is shown as well.
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