MM to CM Converter
Moves between the two smallest everyday metric units, for example when a drawing is in millimeters but a ruler shows centimeters.
1 mm = 0.1 cm
centimeters
1 mm = 0.1 cm
How to convert millimeters to centimeters
Multiply the number of millimeters by 0.1.
Formula
cm = mm × 0.1
Examples
- 5 mm × 0.1 = 0.5 cm
- 25 mm × 0.1 = 2.5 cm
- 150 mm × 0.1 = 15 cm
Millimeters to centimeters conversion table
| Millimeters (mm) | Centimeters (cm) |
|---|---|
| 1 | 0.1 |
| 2 | 0.2 |
| 3 | 0.3 |
| 5 | 0.5 |
| 8 | 0.8 |
| 10 | 1 |
| 15 | 1.5 |
| 20 | 2 |
| 25 | 2.5 |
| 50 | 5 |
| 75 | 7.5 |
| 100 | 10 |
| 150 | 15 |
| 250 | 25 |
| 500 | 50 |
| 1,000 | 100 |
Values rounded to 4 decimal places or 4 significant digits.
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.
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.
Frequently asked questions
How many centimeters are in one millimeter?
One millimeter equals 0.1 centimeters.
How do I convert millimeters to centimeters?
Multiply the number of millimeters by 0.1. For example: 25 mm × 0.1 = 2.5 cm.
How many millimeters are in one centimeter?
One centimeter equals 10 millimeters.
Is the mm to cm 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.