LCM Calculator: Tool for Finding Least Common Multiple

Least Common Multiple Calculator Sign

This calculator 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.

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.

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Least Common Multiple Calculator

Calculate least common multiple for up to 4 numbers at one time.

Special Instructions

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Selected Data Record:

A Data Record is a set of calculator entries that are stored in your web browser's Local Storage. If a Data Record is currently selected in the "Data" tab, this line will list the name you gave to that data record. If no data record is selected, or you have no entries stored for this calculator, the line will display "None".

DataData recordData recordSelected data record: None
1st #:1st number:First number:First number:

1st number:

Enter the first of the numbers to find the least common multiple for.

2nd #:2nd number:Second number:Second number:

2nd number:

Enter the second of the numbers to find the least common multiple for.

Opt 3rd #:Optional 3rd #:Optional 3rd number:Optional third number:

Optional 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.

Opt 4th #:Optional 4th #:Optional 4th number:Optional fourth number:

Optional 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.

LCM:LCM:Least common multiple:Least common multiple:

Least common multiple:

This is the least common multiple for the numbers you entered.

If you would like to save the current entries to the secure online database, tap or click on the Data tab, select "New Data Record", give the data record a name, then tap or click the Save button. To save changes to previously saved entries, simply tap the Save button. Please select and "Clear" any data records you no longer need.

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Help and Tools


Multiples, common multiples, and least common multiples.

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 be 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, ...

And that's all there is to understanding Least Common Multiples.

Adjust Calculator Width:

Move the slider to left and right to adjust the calculator width. Note that the Help and Tools panel will be hidden when the calculator is too wide to fit both on the screen. Moving the slider to the left will bring the instructions and tools panel back into view.

Also note that some calculators will reformat to accommodate the screen size as you make the calculator wider or narrower. If the calculator is narrow, columns of entry rows will be converted to a vertical entry form, whereas a wider calculator will display columns of entry rows, and the entry fields will be smaller in size ... since they will not need to be "thumb friendly".

Show/Hide Popup Keypads:

Select Show or Hide to show or hide the popup keypad icons located next to numeric entry fields. These are generally only needed for mobile devices that don't have decimal points in their numeric keypads. So if you are on a desktop, you may find the calculator to be more user-friendly and less cluttered without them.

Stick/Unstick Tools:

Select Stick or Unstick to stick or unstick the help and tools panel. Selecting "Stick" will keep the panel in view while scrolling the calculator vertically. If you find that annoying, select "Unstick" to keep the panel in a stationary position.

If the tools panel becomes "Unstuck" on its own, try clicking "Unstick" and then "Stick" to re-stick the panel.