Centimetres to Millimetres (cm to mm)
1 cm = 10 mm. Multiply centimetres by 10; the box below does it both ways.
millimetres
1.5 cm = 15 mm · millimetres to centimetres page
How to convert centimetres to millimetres
- Take the value in centimetres.
- Multiply by 10 (because 1 cm = 10 mm).
- Example: 1.5 cm × 10 = 15 mm.
- Going back: divide by 10, or multiply by 0.1.
Where this comes up
Multiply by 10. School geometry, tailoring and lab work switch between the two constantly; the only trap is the decimal point, so 2.5 cm is 25 mm and 0.5 cm is 5 mm. Rulers in India are marked in both, with the small divisions being millimetres.
| cm | mm |
|---|---|
| 0.1 | 1 |
| 0.5 | 5 |
| 1 | 10 |
| 1.5 | 15 |
| 2 | 20 |
| 2.5 | 25 |
| 3 | 30 |
| 5 | 50 |
| 10 | 100 |
| 15 | 150 |
| 20 | 200 |
| 30 | 300 |
| 50 | 500 |
| 100 | 1,000 |
Questions people ask
How many millimetres are in 1 centimetre?
1 cm = 10 mm. To convert, multiply the centimetre value by 10.
What is 5 cm in mm?
5 cm is 50 mm.
How do I convert millimetres back to centimetres?
Divide by 10, or multiply by 0.1: 1 mm = 0.1 cm.
More length conversions
Millimetres to Centimetres (mm to cm) · 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.