0.4 cm = 4 mm. To convert centimeters to millimeters, multiply by 10: 0.4 × 10 = 4.
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: 0.4 × 10 = 4.
- Answer: 0.4 cm = 4 mm.
Centimeters to Millimeters table
| Centimeters (cm) | Millimeters (mm) |
|---|---|
| 0.1 cm | 1 mm |
| 0.2 cm | 2 mm |
| 0.3 cm | 3 mm |
| 0.4 cm | 4 mm |
| 0.5 cm | 5 mm |
| 0.6 cm | 6 mm |
| 0.7 cm | 7 mm |
| 0.8 cm | 8 mm |
| 0.9 cm | 9 mm |
| 1 cm | 10 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.