Convert Millimeters to Centimeters
mm to cm · length conversion
What are millimeters and centimeters?
A millimeter is one-thousandth of a meter, about the thickness of a credit card. A centimeter is one-hundredth of a meter, roughly the width of an adult fingernail. 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 millimeters to centimeters
1 mm = 0.1 cm. To convert, multiply the number of millimeters by 0.1. For example, 5 mm = 0.5 cm, and 20 mm = 2 cm. To go the other way, multiply centimeters by 10 (since 1 cm = 10 mm).
Millimeters to Centimeters conversion table
| Millimeters (mm) | Centimeters (cm) |
|---|---|
| 1 | 0.1 |
| 2 | 0.2 |
| 5 | 0.5 |
| 10 | 1 |
| 20 | 2 |
| 50 | 5 |
| 100 | 10 |
FAQ
What is 1 mm in cm?
1 mm = 0.1 cm. To convert any amount, multiply the number of millimeters by 0.1.
How do I convert centimeters back to millimeters?
Go the other way: 1 cm = 10 mm, so multiply centimeters by 10 to get millimeters.
Is a millimeter bigger than a centimeter?
No — 1 mm is the smaller unit, equal to 0.1 cm (it takes 10 mm to make one cm).
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.