LCM Calculator: Tool for
Finding Least Common Multiple

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The LCM calculator on this page will quickly find the Least Common Multiple of up to 4 numbers at one time.

This free online least common multiple tool will find the LCM of 2, 3, or 4 numbers at once with the click of a button.

Plus, in addition to displaying the LCM, the calculator will also display all preceding multiples for each number, along with the number of times each number divides into the LCM.

Also, if you would ever like to save some time when attempting to find the greatest common factor (GCF) for up to 4 numbers, be sure to check out my Greatest Common Factor Calculator.

What Are Multiples?

The multiples of a number is the set of all numbers that it can be multiplied into evenly. For example, the multiples of the number 2 would be as follows:

Multiples of 2: 2, 4, 6, 8, 10, 12, 14, 16, ...

What is a Common Multiple?

A common multiple occurs when two or more numbers share one or more of the same multiples. For example, the numbers 2 and 8 have the following common multiples because both can divided evenly into each number listed:

Common Multiples of 2 & 8: 8, 16, 24, 32, 40, 48, 56, ...

What is a Least Common Multiple?

A least common multiple (LCM) is the lowest multiple that two or more numbers share. Referring back to the numbers 2 and 8, the LCM would be 8 based on the following set of multiples:

Multiples of 2: 2, 4, 6, 8, 10, 12, 14, ...
Multiples of 8: 8, 16, 24, 32, 40, 48, 56, ...

With that, let's use the LCM Calculator to find the least common multiple of up to 4 different numbers.

LCM Calculator
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Instructions: Enter at least two numbers to find the lowest common multiple for and then click the "Find LCM" button.

Mouse over the blue question marks for a further explanation of each entry field. More in-depth explanations can be found in the glossary of terms located beneath the LCM Calculator.

Help 1st number (#):
Help 2nd number (#):
Help 3rd number (optional #):
Help 4th number (optional #):
Help Least or lowest common multiple:

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LCM Calculator Glossary of Terms

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Multiples: The set of all numbers a given number will divide into equally.

Least Common Multiple: The smallest multiple that a set of two or more numbers all share.

1st number: Enter the first of the numbers to find the least common multiple for.

2nd number: Enter the second of the numbers to find the least common multiple for.

3rd number: Enter the optional 3rd of the numbers to find the lowest common multiple for. In order to include the 3rd number, the 1st and 2nd numbers are required.

4th number: Enter the optional 4th of the numbers to find the smallest common multiple for. In order to include the 4th number, the 1st, 2nd, and 3rd numbers are required.

Least or Lowest common multiple: This is the least common multiple for the numbers you entered.

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