The math
cm = in × 2.54
4 × 2.54 = 10.16 cm = 101.6 mm
Nearby values
| Inches | Centimeters | Millimeters |
|---|---|---|
| 3 in | 7.62 cm | 76.2 mm |
| 3.25 in (3 1/4) | 8.255 cm | 82.55 mm |
| 3.5 in (3 1/2) | 8.89 cm | 88.9 mm |
| 3.75 in (3 3/4) | 9.525 cm | 95.25 mm |
| 4 in | 10.16 cm | 101.6 mm |
| 4.25 in (4 1/4) | 10.795 cm | 107.95 mm |
| 4.5 in (4 1/2) | 11.43 cm | 114.3 mm |
| 4.75 in (4 3/4) | 12.065 cm | 120.65 mm |
| 5 in | 12.7 cm | 127 mm |
Similar everyday sizes
- 4 in is 16 mm longer than the long side of a bank card (85.6 mm).
- 4 in is 18.4 mm shorter than a CD or DVD (120 mm across).
Related conversions
Frequently asked questions
How many cm is 4 inches?
4 inches is exactly 10.16 cm. One inch is defined as 2.54 cm, so multiply 4 by 2.54.
What is 4 inches in mm?
101.6 mm. To get millimeters, multiply inches by 25.4.