Centimeters to Millimeters Converter
1 centimeter = 10 millimeters
1 centimeter equals 10 millimeters
How to convert centimeters to millimeters
Feet, inches, yards and miles use the international foot (0.3048 m). Older US survey-foot records use a different definition; check the survey document before applying these factors.
mm = cm × 10One centimeter is 10 millimeters, so a single multiplication converts any value.
100 mm = 10 × 10Centimeters to millimeters conversion table
Common values in centimeters, converted to millimeters.
| Centimeters (cm) | Millimeters (mm) |
|---|---|
| 1 | 10 |
| 2 | 20 |
| 3 | 30 |
| 4 | 40 |
| 5 | 50 |
| 10 | 100 |
| 20 | 200 |
| 25 | 250 |
| 50 | 500 |
| 100 | 1,000 |
| 250 | 2,500 |
| 500 | 5,000 |
| 1,000 | 10,000 |
About these units
centimetercm
One hundredth of a metre, widely used for body and object measurements.
millimetermm
One thousandth of a metre, the usual unit for engineering drawings.
Sources and precision
Table results are rounded to 8 significant digits; formula constants may be rounded to 10. Worked example answers use 6 significant digits. The converter starts at 6 significant digits and lets you change display precision. Calculations use the stored factors without intermediate rounding. Exact unit definitions do not make an input measurement more precise; conventional and measured factors follow the assumptions stated here.