How to convert centimeters to millimeters
One centimeter equals 10 millimeters. To convert, multiply the number of centimeters by 10:
Mental-math shortcut: Multiply centimeters by 10: 2.5 cm = 25 mm.
Example
Convert 2.5 centimeters to millimeters: 2.5 cm × 10 = 25 mm.
Centimeters to Millimeters conversion chart
| Centimeters (cm) | Millimeters (mm) |
|---|---|
| 0.1 | 1 |
| 0.5 | 5 |
| 1 | 10 |
| 1.5 | 15 |
| 2 | 20 |
| 2.5 | 25 |
| 3 | 30 |
| 4 | 40 |
| 5 | 50 |
| 10 | 100 |
| 15 | 150 |
| 20 | 200 |
| 30 | 300 |
| 50 | 500 |
| 100 | 1,000 |
What is a centimeter?
A centimeter (cm) is one hundredth of a meter, roughly the width of a fingernail. It is the everyday unit for height, body measurements and clothing sizes in most of the world. One centimeter is about 0.3937 inches, and exactly 2.54 centimeters make one inch.
What is a millimeter?
A millimeter (mm) is one thousandth of a meter. It is used for small, precise measurements such as screw and drill-bit sizes, jewelry, rainfall, camera lenses and engineering drawings. There are 10 millimeters in a centimeter and exactly 25.4 millimeters in an inch.
Converting the other way? Use the Millimeters to Centimeters converter.
Frequently asked questions
How many millimeters is one centimeter?
One centimeter is 10 millimeters.
How do I convert centimeters to millimeters?
Multiply the value in centimeters by 10. For example, 2.5 cm × 10 = 25 mm.
What is 15 cm in millimeters?
15 cm is 150 millimeters.
How do I convert millimeters to centimeters?
Multiply millimeters by 0.1 (or divide by 10). You can also use our Millimeters to Centimeters converter.
Conversions use the internationally agreed definitions of each unit (for example, 1 inch = 2.54 cm exactly) and are rounded for display. Volume converters use US customary units unless stated otherwise.
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