📏 Centimeters to Millimeters Converter
Convert centimeters (cm) to millimeters (mm) instantly, with the formula, a worked example and a conversion table.
Quick answer: 1 centimeter (cm) = 10 millimeters (mm). Formula: mm = cm × 10.
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Centimeters to Millimeters Converter inputs
Result
Centimeters to Millimeters conversion table
| Centimeters (cm) | Millimeters (mm) |
|---|---|
| 0.1 cm | 1 mm |
| 0.5 cm | 5 mm |
| 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 |
| 1,000 cm | 10,000 mm |
Other length conversions
cm to mmcm to mcm to kmcm to incm to ftcm to ydcm to micm to nmi
How to convert centimeters to millimeters
Multiply the number of centimeters by 10 to get millimeters: mm = cm × 10.
Example: 5 cm = 50 mm.
The centimeter (cm) and the millimeter (mm) are both units of length. Need the opposite direction? Use the mm to cm converter.
Popular conversions
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Metric and imperial units
The metric system (SI) is used by almost every country and by science worldwide. Its units scale by powers of ten – 1 kilometer is 1,000 meters, 1 meter is 100 centimeters – which makes conversions inside the system easy. The imperial and US customary systems (inches, feet, pounds, gallons) are still used daily in the United States and partly in the UK.
Since 1959 the inch has been defined as exactly 2.54 centimeters and the pound as exactly 0.45359237 kilograms, so conversions between the two systems are exact. Note that a US gallon (3.785 L) and an imperial gallon (4.546 L) are different – choose the right one above.
This converter covers 10 categories and 66 units: length, weight, temperature, volume, area, speed, time, data, energy, pressure.
Frequently asked questions
How many millimeters are in a centimeter?
1 centimeter = 10 millimeters.
How do I convert centimeters to millimeters?
Use the formula mm = cm × 10. For example, 5 cm = 50 mm.
How do I convert millimeters back to centimeters?
1 millimeter = 0.1 centimeters. Use the mm to cm converter linked on this page.
Are these conversions exact?
Yes – all factors use the internationally defined values (for example 1 inch = 2.54 cm exactly, 1 pound = 0.45359237 kg exactly). Results are rounded to 8 significant digits for display.