Millimetres to Centimetres (mm to cm)
1 mm = 0.1 cm. Multiply millimetres by 0.1; the box below does it both ways.
centimetres
10 mm = 1 cm · centimetres to millimetres page
How to convert millimetres to centimetres
- Take the value in millimetres.
- Multiply by 0.1 (because 1 mm = 0.1 cm).
- Example: 10 mm × 0.1 = 1 cm.
- Going back: divide by 0.1, or multiply by 10.
Where this comes up
Divide by 10. Tile sizes, phone thickness and rainfall are the everyday millimetre figures: a 600 × 600 mm tile is 60 × 60 cm, an 8.1 mm phone is 0.81 cm thick, and a 100 mm rainfall day is 10 cm of rain.
| mm | cm |
|---|---|
| 1 | 0.1 |
| 2 | 0.2 |
| 5 | 0.5 |
| 10 | 1 |
| 15 | 1.5 |
| 20 | 2 |
| 25 | 2.5 |
| 30 | 3 |
| 50 | 5 |
| 75 | 7.5 |
| 100 | 10 |
| 150 | 15 |
| 250 | 25 |
| 1,000 | 100 |
Questions people ask
How many centimetres are in 1 millimetre?
1 mm = 0.1 cm. To convert, multiply the millimetre value by 0.1.
What is 30 mm in cm?
30 mm is 3 cm.
How do I convert centimetres back to millimetres?
Divide by 0.1, or multiply by 10: 1 cm = 10 mm.
More length conversions
Centimetres to Millimetres (cm to mm) · m to ft · ft to m · cm to in · in to cm · cm to ft · ft to cm · mm to in · in to mm · ft to in · in to ft · all converters
Factors are the exact international definitions; last checked 2026-10-10.