Millimetres to Centimetres
Convert millimetres (mm) to centimetres (cm) instantly — with formula and reference table.
mm
cm
Quick answer: 1 mm = 0.1 cm. To convert millimetres to centimetres, multiply by mm × 0.1.
Converting millimetres to centimetres
This converter changes a value in millimetres (mm) into centimetres (cm). One millimetre equals 0.1 cm. One centimetre equals 10 millimetres, so converting millimetres to centimetres means dividing by 10. The conversion runs entirely in your browser — enter a value and the result updates instantly, in either direction.
Formula
cm = mm × 0.1
Example
Convert 10 mm to cm: 10 × 0.1 = 1 cm.
Millimetres to Centimetres conversion table
| Millimetres (mm) | Centimetres (cm) |
|---|---|
| 1 mm | 0.1 cm |
| 2 mm | 0.2 cm |
| 3 mm | 0.3 cm |
| 5 mm | 0.5 cm |
| 10 mm | 1 cm |
| 20 mm | 2 cm |
| 25 mm | 2.5 cm |
| 50 mm | 5 cm |
| 100 mm | 10 cm |
How to use this converter
- Enter a value in the millimetres (mm) field.
- Read the converted value in centimetres (cm) below.
- Type into the cm field instead to convert in reverse, or use the swap button.
Frequently asked questions
How many centimetres are in a millimetre?
1 millimetre equals 0.1 centimetres.
How do I convert 45 mm to cm?
45 divided by 10 = 4.5 cm.
How many mm in a cm?
There are 10 millimetres in 1 centimetre.