Centimeters to Millimeters Converter
Convert centimeters (cm) to millimeters (mm) instantly. Type a value above and the result updates while you type. 1 centimeter equals 10 millimeters.
Result updates as you type. Values are calculated locally in your browser — nothing is sent to a server.
The formula
1 centimeter = 10 millimeters
Multiply the centimeters value by 10 to get millimeters. Or divide by 0.1 to go the other way.
Centimeters to millimeters conversion table
| cm | mm |
|---|---|
| 1 | 10 |
| 2 | 20 |
| 3 | 30 |
| 4 | 40 |
| 5 | 50 |
| 6 | 60 |
| 7 | 70 |
| 8 | 80 |
| 9 | 90 |
| 10 | 100 |
| 15 | 150 |
| 20 | 200 |
| 25 | 250 |
| 50 | 500 |
| 75 | 750 |
| 100 | 1000 |
Worked examples
- 5 cm × 10 = 50 mm
- 30 cm × 10 = 300 mm
- 165 cm × 10 = 1650 mm
Conversion factors follow the exact international definitions (SI/BIPM; imperial units per the 1959 International Yard and Pound Agreement, maintained by NIST). NIST unit conversion reference
Factors last verified August 2026 · Built by Jeffrey Tepper.
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Frequently asked questions
How many millimeters are in 1 centimeter?
1 centimeter equals 10 millimeters (cm → mm).
How do you convert centimeters to millimeters?
Multiply the number of centimeters by 10. For example: 10 cm × 10 = 100 mm.
What is 180 cm in mm?
180 cm equals 1800 mm.
Which is bigger: 1 centimeter or 1 millimeter?
1 centimeter is bigger: it equals 10 millimeters.