4.2 mm ≈ 0.165354 in. To convert millimeters to inches, multiply by 0.039370079: 4.2 × 0.039370079 = 0.165354.
How to convert millimeters to inches
in = mm × 0.039370079
- 1 mm = 0.039370079 in (and 1 in = 25.4 mm).
- Multiply the amount by the factor: 4.2 × 0.039370079 = 0.165354.
- Answer: 4.2 mm ≈ 0.165354 in (rounded to 6 significant figures).
Millimeters to Inches table
| Millimeters (mm) | Inches (in) |
|---|---|
| 3.7 mm | 0.145669 in |
| 3.8 mm | 0.149606 in |
| 3.9 mm | 0.153543 in |
| 4 mm | 0.15748 in |
| 4.1 mm | 0.161417 in |
| 4.2 mm | 0.165354 in |
| 4.3 mm | 0.169291 in |
| 4.4 mm | 0.173228 in |
| 4.5 mm | 0.177165 in |
| 4.6 mm | 0.181102 in |
| 4.7 mm | 0.185039 in |
| mm | in |
|---|---|
| 1 mm | 0.0393701 in |
| 5 mm | 0.19685 in |
| 10 mm | 0.393701 in |
| 50 mm | 1.9685 in |
| 100 mm | 3.937 in |
| 1,000 mm | 39.3701 in |
Good to know
1 inch = 2.54 cm exactly; 1 cm = 10 mm; 1 m = 100 cm; 1 foot = 12 inches = 30.48 cm.