This free length converter changes millimeters (mm) into centimeters (cm) and back again, updating live as you type. It is handy for rulers, technical drawings, sewing, and any measurement that mixes the two small metric units.
How it works
A centimetre is exactly ten millimetres, so the conversion is a single-decimal-place shift:
- cm = mm ÷ 10
- mm = cm × 10
The relationship is exact and linear, so the converter is bidirectional — edit either field and the other updates instantly.
Example
A screen bezel is 45 mm wide and you want it in centimetres.
45 ÷ 10 = 4.5 cm.
| Millimeters (mm) | Centimeters (cm) |
|---|---|
| 10 mm | 1 cm |
| 45 mm | 4.5 cm |
| 50 mm | 5 cm |
| 100 mm | 10 cm |
| 250 mm | 25 cm |
All calculations run entirely in your browser — no data is sent to any server.