Free length calculator
Centimeters to Millimeters Converter (cm to mm)
Enter a value to convert centimeters to millimeters. Results update as you type and include the calculation steps.
cm
Result
Enter a value above
In decimal inches
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As a common fraction
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Feet and inches
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How to convert centimeters to millimeters
Multiply the centimeters value by 10.
mm = cm x 10
Worked example
For 20 cm: 20 x 10 = 200 mm.
The calculator keeps more precision internally than the number displayed, so repeated conversions remain accurate.
Centimeters to Millimeters conversion table
| Centimeters (cm) | Millimeters (mm) |
|---|---|
| 0.1 cm | 1 mm |
| 1 cm | 10 mm |
| 2 cm | 20 mm |
| 5 cm | 50 mm |
| 10 cm | 100 mm |
| 20 cm | 200 mm |
| 25 cm | 250 mm |
| 50 cm | 500 mm |
| 100 cm | 1000 mm |
| 250 cm | 2500 mm |
| 500 cm | 5000 mm |
| 1000 cm | 10000 mm |
About the units
Centimeter
A centimeter is one hundredth of a meter, 10 millimeters, and exactly 1/2.54 of an inch.
Millimeter
A millimeter is one thousandth of a meter, one tenth of a centimeter, and exactly 1/25.4 of an inch.