mm to cm
Move between the small divisions on a metric ruler. Ten millimeters make one centimeter.
Edit either value. Use a decimal point; commas group thousands. Rounding affects display only.
How to convert millimeters to centimeters
Move between the small divisions on a metric ruler. Ten millimeters make one centimeter.
Formula coefficients shown rounded. Calculations use the stored factors before display rounding.
A worked example
For 10 mm, the result is approximately 1 cm. To go the other way, edit the result above or swap the units.
International feet and miles are used, not historical US survey units.
Where the numbers come from
Factors follow NIST conversion references and documented unit definitions. Read our accuracy and rounding notes.
The table and method describe this page’s original pair. Changing units above does not change this reference section.
| Millimeters (mm) | Centimeters (cm) |
|---|---|
| 1 | 0.1 |
| 2 | 0.2 |
| 5 | 0.5 |
| 10 | 1 |
| 20 | 2 |
| 25 | 2.5 |
| 50 | 5 |
| 100 | 10 |
| 500 | 50 |
| 1000 | 100 |