CM to MM Converter
Useful when a part, bead or screw is specified in millimeters but you measured in centimeters.
1 cm = 10 mm
millimeters
1 cm = 10 mm
How to convert centimeters to millimeters
Multiply the number of centimeters by 10.
Formula
mm = cm × 10
Examples
- 0.5 cm × 10 = 5 mm
- 2.5 cm × 10 = 25 mm
- 12 cm × 10 = 120 mm
Centimeters to millimeters conversion table
| Centimeters (cm) | Millimeters (mm) |
|---|---|
| 0.1 | 1 |
| 0.2 | 2 |
| 0.5 | 5 |
| 1 | 10 |
| 1.5 | 15 |
| 2 | 20 |
| 2.5 | 25 |
| 3 | 30 |
| 4 | 40 |
| 5 | 50 |
| 7.5 | 75 |
| 10 | 100 |
| 15 | 150 |
| 20 | 200 |
| 50 | 500 |
| 100 | 1,000 |
Values rounded to 4 decimal places or 4 significant digits.
About centimeters
The centimeter is one hundredth of a meter, or 10 millimeters. In most of the world it is the everyday unit for body height, clothing measurements and anything you would measure with a school ruler.
About millimeters
The millimeter is one thousandth of a meter. It is the standard unit on engineering and architectural drawings, and it is used for small, precise dimensions such as screw diameters, rainfall totals and the thickness of a phone.
Frequently asked questions
How many millimeters are in one centimeter?
One centimeter equals 10 millimeters.
How do I convert centimeters to millimeters?
Multiply the number of centimeters by 10. For example: 2.5 cm × 10 = 25 mm.
How many centimeters are in one millimeter?
One millimeter equals 0.1 centimeters.
Is the cm to mm conversion exact?
Yes. The factor follows directly from the official definitions of both units, so the only rounding is in how many decimals are displayed.