How to Convert CM to MM

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How to Convert CM to MM: A Step-by-Step Guide

Converting between centimeters (CM) and millimeters (MM) is a common task for those dealing with measurements or calculations involving length or distance. In this guide, we’ll explain the step-by-step process for switching from one unit of measure to the other.

Step 1: Understand the Difference between CM and MM

Before you can convert CM to MM, it’s important to have a grasp of the differences between the two measurement units. CM stands for centimeter and is a unit of length in the metric system. A centimeter is equal to one-hundredth of a meter, so a CM is 1/100th the size of a meter. MM stands for millimeters and is a unit of length in the metric system. A millimeter is equal to one-thousandth of a meter, so a MM is 1/1000th the size of a meter. Now that we’ve clarified the distinction between the two units of measure, we’re ready to move forward.

Step 2: Gather Necessary Measurements

Now that you know the difference between CM and MM, it’s time to gather the measurements you need to convert CM to MM. To do this, you’ll need to know the measurement, in centimeters, that you’re starting with. Whether it’s centimeters or millimeters, write down the measurement in your chosen unit on a piece of paper so you can easily keep track of it.

Step 3: Understand The Conversion Process

Now that you’ve gathered the necessary measurements, it’s time to understand the conversion process. To convert CM to MM, simply multiply the number of centimeters by 10. This is because one centimeter is equal to 10 millimeters. As an example, if you have a measurement of 5 CM, you would multiply that number by 10 to get 50 MM. This process can be applied to any number of centimeters you have.

Step 4: Convert CM to MM

Now that you understand the conversion process, it’s time to make the conversion. Follow the steps below to convert CM to MM:

  1. Take the number of centimeters and multiply it by 10.
  2. The result of this calculation will give you the number of millimeters.

Step 5: Double-Check the Conversion

Finally, you’ll want to double-check your conversion to make sure it’s correct. To do this, take the number of millimeters you’ve calculated and divide it by 10. This will give you the number of centimeters you started with. For example, if you started with 10 CM and calculated 100 MM, dividing 100 by 10 will give you back 10 CM. If these numbers match, then you know your conversion is correct.


Converting between CM and MM is a simple procedure once you understand the difference between the two units of measure and the conversion process. By following the steps outlined in this guide, you can easily switch between CM and MM without any trouble. Just remember to double-check your conversion to make sure it’s accurate.

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