How to use Centimeters to Millimeters
Enter the value in cm, then select Calculate. The result is shown in mm. Each centimetre contains ten millimetres; this is a length conversion, not an area conversion.
The formula
mm = cm × 10
Examples
- 1 centimeters to millimeters
10 mm
- 10 centimeters to millimeters
100 mm
- 250 centimeters to millimeters
2,500 mm
Centimeters to Millimeters conversion table
| Centimeters | Millimeters |
|---|---|
| 1 | 10 mm |
| 2 | 20 mm |
| 3 | 30 mm |
| 4 | 40 mm |
| 5 | 50 mm |
| 6 | 60 mm |
| 7 | 70 mm |
| 8 | 80 mm |
| 9 | 90 mm |
| 10 | 100 mm |
| 15 | 150 mm |
| 20 | 200 mm |
| 25 | 250 mm |
| 30 | 300 mm |
| 40 | 400 mm |
| 50 | 500 mm |
| 75 | 750 mm |
| 100 | 1,000 mm |
| 250 | 2,500 mm |
| 500 | 5,000 mm |
| 1,000 | 10,000 mm |
Limitations and assumptions
Uses standard unit definitions. Results are rounded to at most eight decimal places; very small results may round to zero. Each centimetre contains ten millimetres; this is a length conversion, not an area conversion.
Frequently asked questions
How many millimeters are in one centimeter?
One centimeter equals 10 mm. The formula is mm = cm × 10.
How do I convert centimeters to millimeters?
Use mm = cm × 10. For example, 10 centimeters gives 100 mm. Enter your own value above and the converter does the arithmetic for you.
How do I convert millimeters back to centimeters?
Use the Millimeters to Centimeters converter, or invert the factor by dividing instead of multiplying.
Is this conversion exact?
Every length conversion here hangs on one exact definition, 1 inch = 2.54 cm, so results are exact apart from display rounding.
Reference source
Checked against the official reference on nist.gov.
Formula, example and source checked 2026-11-09. This is a content check, not independent expert certification.