Convert centimeters to millimeters
Enter a value in centimeters to convert it to millimeters.
centimeters to millimeters reference
| centimeters | millimeters |
|---|---|
| 1 cm | 10 mm |
| 2 cm | 20 mm |
| 5 cm | 50 mm |
| 10 cm | 100 mm |
| 25 cm | 250 mm |
| 50 cm | 500 mm |
| 100 cm | 1000 mm |
The conversion factor
One centimeter is 10 millimeters. So to convert, multiply your figure in centimeters by 10. To go the other way, multiply millimeters by 0.1, or use the millimeters to centimeters converter.
Doing it in your head
For a quick estimate, round the factor: roughly "times 10". Use the exact converter above when the number matters.
Where this conversion comes up
Height, distance, DIY measurements, maps, and any spec sheet that mixes metric and imperial.
See the common unit conversions cheat sheet for the factors worth memorising.
Related tools
Frequently asked questions
How many millimeters are in a centimeter?
1 centimeter = 10 millimeters.
What is the formula to convert centimeters to millimeters?
Multiply the number of centimeters by 10. To go back the other way, multiply millimeters by 0.1.
What is 10 centimeters in millimeters?
10 centimeters = 100 millimeters. The reference table below lists more common values.
Is this converter accurate?
It uses the internationally defined conversion factors and computes at full floating-point precision, then rounds only the displayed result. For everyday purposes it is exact; for legal, engineering or scientific work, confirm the required number of significant figures.
Does it work offline?
Yes. The conversion runs in your browser with no server call, so it keeps working with no connection, and nothing you enter is uploaded.
Last reviewed: September 2026. Figures and formulas are checked against their published sources; see the site's data notes.