Millimeters to centimeters
1 millimeter = 0.1 centimeters
Type a value in millimeters (mm) to get centimeters (cm) straight away. A millimeter is smaller than a centimeter, so the number goes down. Both units belong to length, measured here against the meter.
1 mm = 0.1 cm
Formula
cm = mm × 0.1
One millimeter is 0.1 centimeters, so multiply by that factor. You can also divide by 10, the number of millimeters in one centimeter. Here mm is the value in millimeters and cm is the result in centimeters.
Worked example: 250 millimeters × 0.1 = 25 centimeters.
Millimeters to centimeters table
| millimeters (mm) | centimeters (cm) |
|---|---|
| 1 mm | 0.1 cm |
| 2 mm | 0.2 cm |
| 3 mm | 0.3 cm |
| 4 mm | 0.4 cm |
| 5 mm | 0.5 cm |
| 6 mm | 0.6 cm |
| 7 mm | 0.7 cm |
| 8 mm | 0.8 cm |
| 9 mm | 0.9 cm |
| 10 mm | 1 cm |
| 15 mm | 1.5 cm |
| 20 mm | 2 cm |
| 25 mm | 2.5 cm |
| 30 mm | 3 cm |
| 40 mm | 4 cm |
| 50 mm | 5 cm |
| 60 mm | 6 cm |
| 75 mm | 7.5 cm |
| 100 mm | 10 cm |
Everyday millimeters in centimeters
| What it is | mm | cm |
|---|---|---|
| a sheet of paper (about) | 0.1 mm | 0.01 cm |
| a standard pencil lead | 2 mm | 0.2 cm |
| a 8 mm drill bit | 8 mm | 0.8 cm |
| the short side of an A4 sheet | 210 mm | 21 cm |
| the long side of an A4 sheet | 297 mm | 29.7 cm |
Quick estimate in your head
Divide by 10^1: move the decimal point 1 place left.
About the units
Millimeter (mm). One thousandth of a meter. Used for engineering drawings, rainfall and screen sizes in some countries.
Centimeter (cm). One hundredth of a meter. The usual metric unit for height, clothing and small objects.
Going the other way, 1 centimeter is 10 millimeters.
Questions
How many centimeters are in 1 millimeter?
1 millimeter is 0.1 centimeters, and 1 centimeter is 10 millimeters.
How do I convert millimeters to centimeters?
Use cm = mm × 0.1. For example, 250 millimeters × 0.1 = 25 centimeters.
Is the millimeter to centimeter factor exact?
The factor comes from the unit definitions. Results here are rounded to 6 significant digits for display.
How much is the long side of an A4 sheet in centimeters?
297 mm is 29.7 cm.
Source for the conversion factor: NIST SP 811, Appendix B (conversion factors).
Related conversions
- centimeters to millimeters
- centimeters to inches
- inches to centimeters
- centimeters to feet
- feet to centimeters
- centimeters to meters