Convert Centimeters to Millimeters
cm to mm · length conversion
What are centimeters and millimeters?
A centimeter is one-hundredth of a meter, roughly the width of an adult fingernail. A millimeter is one-thousandth of a meter, about the thickness of a credit card. For scale: a doorway is about 2 m (6.6 ft) tall, and a marathon is 42.2 km (26.2 mi).
How to convert centimeters to millimeters
1 cm = 10 mm. To convert, multiply the number of centimeters by 10. For example, 5 cm = 50 mm, and 20 cm = 200 mm. To go the other way, multiply millimeters by 0.1 (since 1 mm = 0.1 cm).
Centimeters to Millimeters conversion table
| Centimeters (cm) | Millimeters (mm) |
|---|---|
| 1 | 10 |
| 2 | 20 |
| 5 | 50 |
| 10 | 100 |
| 20 | 200 |
| 50 | 500 |
| 100 | 1,000 |
FAQ
What is 1 cm in mm?
1 cm = 10 mm. To convert any amount, multiply the number of centimeters by 10.
How do I convert millimeters back to centimeters?
Go the other way: 1 mm = 0.1 cm, so multiply millimeters by 0.1 to get centimeters.
Is a centimeter bigger than a millimeter?
Yes — 1 cm is the larger unit, equal to 10 mm.
Are these length conversions exact?
They use the standard internationally-defined conversion factors. Results are rounded to six significant figures for readability, which is accurate enough for everyday and most technical use.