3.1 cm = 31 mm. To convert centimeters to millimeters, multiply by 10: 3.1 × 10 = 31.
How to convert centimeters to millimeters
mm = cm × 10
- 1 cm = 10 mm (and 1 mm = 0.1 cm).
- Multiply the amount by the factor: 3.1 × 10 = 31.
- Answer: 3.1 cm = 31 mm.
Centimeters to Millimeters table
| Centimeters (cm) | Millimeters (mm) |
|---|---|
| 2.6 cm | 26 mm |
| 2.7 cm | 27 mm |
| 2.8 cm | 28 mm |
| 2.9 cm | 29 mm |
| 3 cm | 30 mm |
| 3.1 cm | 31 mm |
| 3.2 cm | 32 mm |
| 3.3 cm | 33 mm |
| 3.4 cm | 34 mm |
| 3.5 cm | 35 mm |
| 3.6 cm | 36 mm |
| cm | mm |
|---|---|
| 1 cm | 10 mm |
| 5 cm | 50 mm |
| 10 cm | 100 mm |
| 50 cm | 500 mm |
| 100 cm | 1,000 mm |
| 1,000 cm | 10,000 mm |
Good to know
1 inch = 2.54 cm exactly; 1 cm = 10 mm; 1 m = 100 cm; 1 foot = 12 inches = 30.48 cm.