Centimeters to Millimeters Converter (cm to mm)
One centimeter equals 10 millimeters — multiply centimeters by 10 to convert to millimeters. It is the simplest metric length conversion there is: just add a zero, or shift the decimal one place to the right.
The formula
Multiply your centimeter value by 10 to get millimeters.
mm = cm × 10
Example: 12.5 cm × 10 = 125 mmBy definition a centimeter is one hundredth of a meter and a millimeter is one thousandth, so a centimeter is exactly ten millimeters.
Conversion table
| Centimeters (cm) | Millimeters (mm) |
|---|---|
| 1 | 10 |
| 2 | 20 |
| 5 | 50 |
| 10 | 100 |
| 25 | 250 |
| 50 | 500 |
| 100 | 1000 |
| 200 | 2000 |
| 500 | 5000 |
| 1000 | 10000 |
How to convert online
- Type the number of centimeters into the first box.
- Read the equivalent in millimeters instantly in the second box.
- Enter a millimeter value instead to convert back to centimeters.
Use the Centimeter to Millimeter Converter — free and instant in your browser.
Where this conversion is used
This conversion is a staple of engineering drawings, machining and CNC work, 3D printing, jewellery and model making, and any technical field where centimeter measurements need to be expressed in the finer millimeter units that tolerances are specified in.
FAQ
How many millimeters are in a centimeter?
One centimeter equals 10 millimeters. For example, 10 cm is 100 mm and 100 cm is 1,000 mm.
What is 2.5 cm in millimeters?
2.5 cm × 10 = 25 millimeters.
Is the conversion exact?
Yes — a centimeter is exactly 10 millimeters, so the conversion has no rounding.
How do I convert millimeters back to centimeters?
Divide millimeters by 10, or use our Millimeter to Centimeter converter for the reverse direction.
Related converters
- Millimeter to Centimeter Converter
- Centimeter to Meter Converter
- Centimeter to Inch Converter
- Centimeter to Kilometer Converter
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