Centimetres to Millimetres
Convert centimetres (cm) to millimetres (mm) instantly — with formula and reference table.
cm
mm
Quick answer: 1 cm = 10 mm. To convert centimetres to millimetres, multiply by cm × 10.
Converting centimetres to millimetres
This converter changes a value in centimetres (cm) into millimetres (mm). One centimetre equals 10 mm. One centimetre equals exactly 10 millimetres. The conversion runs entirely in your browser — enter a value and the result updates instantly, in either direction.
Formula
mm = cm × 10
Example
Convert 10 cm to mm: 10 × 10 = 100 mm.
Centimetres to Millimetres conversion table
| Centimetres (cm) | Millimetres (mm) |
|---|---|
| 1 cm | 10 mm |
| 2 cm | 20 mm |
| 3 cm | 30 mm |
| 5 cm | 50 mm |
| 10 cm | 100 mm |
| 20 cm | 200 mm |
| 25 cm | 250 mm |
| 50 cm | 500 mm |
| 100 cm | 1000 mm |
How to use this converter
- Enter a value in the centimetres (cm) field.
- Read the converted value in millimetres (mm) below.
- Type into the mm field instead to convert in reverse, or use the swap button.
Frequently asked questions
How many millimetres are in a centimetre?
1 centimetre equals 10 millimetres.
How do I convert 3.5 cm to mm?
3.5 times 10 = 35 mm.
How many mm is 30 cm?
30 cm equals 300 mm.