Length and Area
mmtocm
Convert millimetres (mm) to centimetres (cm).
Factor1 mm = 0.1 cm
Converter
mm
Accepts numbers or expressions, e.g. 150 + 14.7
Result
cm
Rendered to 6 significant figures.
Formula
Formula
cm = mm × 0.1
Multiply any value in millimetres by 0.1 to obtain the value in centimetres.
Worked example
Convert 10 mm to cm.
- 01Start with 10 mm.
- 02Multiply by the conversion factor: 10 × 0.1 = 1 cm.
Result10 mm = 1 cm
Conversion table
| mm | cm |
|---|---|
| 1 | 0.1 |
| 2 | 0.2 |
| 5 | 0.5 |
| 10 | 1 |
| 20 | 2 |
| 50 | 5 |
| 100 | 10 |
| 200 | 20 |
| 500 | 50 |
| 1000 | 100 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from mm to cm?
1 mm equals 0.1 cm. To convert, multiply the value in millimetres by 0.1.
How do I convert 1 mm to cm?
1 mm = 0.1 cm. For any value, multiply by 0.1.
How do I convert cm back to mm?
Divide by the same factor — or equivalently, multiply by 10. So 1 cm = 10 mm.
When would I need to convert millimetre to centimetre?
Length conversions appear in piping, layout, and mechanical drawings — particularly when reconciling imperial fittings or instrument lengths with metric plant drawings.
Is the conversion exact?
Yes. Both mm and cm are defined by exact SI relationships, so the displayed factor is exact (any rounding shown is only for display).