Convert centimeters to millimeters
1 centimeter equals 10 millimeters. Type any number below — the other side updates instantly.
Centimeters to millimeters — quick reference
| centimeters | millimeters |
|---|---|
| 0.5 cm | 5 mm |
| 1 cm | 10 mm |
| 2 cm | 20 mm |
| 3 cm | 30 mm |
| 5 cm | 50 mm |
| 8 cm | 80 mm |
| 10 cm | 100 mm |
| 12 cm | 120 mm |
| 15 cm | 150 mm |
| 20 cm | 200 mm |
| 25 cm | 250 mm |
| 30 cm | 300 mm |
| 50 cm | 500 mm |
| 75 cm | 750 mm |
| 100 cm | 1000 mm |
| 150 cm | 1500 mm |
| 200 cm | 2000 mm |
| 500 cm | 5000 mm |
How to convert
Multiply the number of centimeters by 10 to get millimeters. To go the other way, multiply millimeters by 0.1 to get centimeters. The conversion factor is fixed and exact, so you can use this on any value.
About these units
Centimeters
- Definition
- A centimeter (symbol: cm) is one-hundredth of a meter, the SI base unit of length. 1 cm equals 10 mm or about 0.394 inches.
- History
- The centimeter dates to the 1799 establishment of the metric system. The "centi-" prefix means one-hundredth in Latin.
- Current use
- Used worldwide for everyday measurements — body height, clothing sizes, paper, furniture — anywhere imperial countries would use inches.
Millimeters
- Definition
- A millimeter (symbol: mm) is one-thousandth of a meter, the SI base unit of length. It equals 0.1 cm or about 0.0394 inches.
- History
- The millimeter was defined alongside the meter in 1799 as part of the original metric system in revolutionary France. It became part of the modernized SI in 1960.
- Current use
- Millimeters are the dominant unit for technical drawings, hardware tolerances, screen sizes, and any small measurement in metric countries.
Frequently asked
- How many millimeters are in 1 centimeter?
- 1 centimeter = 10 millimeters.
- How do you convert centimeters to millimeters?
- Multiply the number of centimeters by 10 to get millimeters. To go the other way, multiply millimeters by 0.1 to get centimeters. The conversion factor is fixed and exact, so you can use this on any value.
- What is 20 centimeters in millimeters?
- 20 centimeters = 200 millimeters.
Convert centimeters to other length units
Convert other length units to millimeters
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