Centimeters to Millimeters
Convert centimeters to millimeters instantly. 1 cm = 10 mm. Includes the exact factor, a conversion table of common values and the definition of both units.
How to convert centimeters to millimeters
To convert centimeters to millimeters, multiply by 10. The relationship is fixed, so the same factor works for any quantity — there is nothing to look up and nothing that changes with temperature, location or context.
mm = cm × 10
Centimeters to Millimeters conversion table
The values people look up most often, rounded for reading. Use the calculator above for anything in between.
| Centimeters | Millimeters |
|---|---|
| 1 cm | 10 mm |
| 2 cm | 20 mm |
| 3 cm | 30 mm |
| 5 cm | 50 mm |
| 10 cm | 100 mm |
| 20 cm | 200 mm |
| 25 cm | 250 mm |
| 50 cm | 500 mm |
| 100 cm | 1,000 mm |
| 500 cm | 5,000 mm |
| 1,000 cm | 10,000 mm |
What is a centimeter?
A hundredth of a metre. The everyday metric unit for body measurements and paper sizes.
What is a millimeter?
A thousandth of a metre. The default fine unit on metric engineering drawings.
The formula
mm = cm × 10
Every result on this page comes from this formula. Nothing is rounded until the final display, so figures match a spreadsheet to the cent.
How to use the Centimeters to Millimeters
- Type the number of centimeters you want to convert.
- Read the result in millimeters straight away — there is no button to press.
- Check the table below for the values that come up most often, or reverse the conversion with the linked millimeters to centimeters page.
Centimeters to Millimeters — frequently asked questions
How many millimeters are in a centimeter?
One centimeter equals 10 mm. mm = cm × 10
What is the formula to convert centimeters to millimeters?
The formula is mm = cm × 10. It is an exact definition rather than an approximation, so the conversion never drifts no matter how large the number.
How do I convert millimeters back to centimeters?
Divide instead of multiplying: one millimeter is 0.1 cm. The reverse converter is linked in the related tools list.
Is this conversion exact?
Yes. Both units are defined against the same base unit by international agreement, so the factor is exact — any rounding you see is only in the display, which you can widen by entering more decimal places.
Is this centimeters to millimeters free to use?
Yes. Every calculator on the site is free, needs no sign-up, and runs entirely in your browser, so your figures never leave your device.
What people search for
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About this calculator
Written and reviewed by The Samsung Calculator editorial team. Every calculator is written against a published formula, reviewed against at least one independent reference implementation, and dated when it changes.
Last reviewed August 15, 2026 · Calculation runs client-side · No data collected · Report an error