How to convert inches to millimeters
mm = in × 25.4
One inch equals 25.4 mm, so multiply the value in inches by 25.4. Example: 10 in = 254 mm.
The inch is defined as exactly 25.4 mm, the foot as exactly 0.3048 m and the mile as exactly 1,609.344 m (international agreement of 1959). The nautical mile is exactly 1,852 m.
Inches to millimeters conversion table
| Inches (in) | Millimeters (mm) |
|---|---|
| 1 in | 25.4 mm |
| 2 in | 50.8 mm |
| 3 in | 76.2 mm |
| 5 in | 127 mm |
| 10 in | 254 mm |
| 15 in | 381 mm |
| 20 in | 508 mm |
| 25 in | 635 mm |
| 50 in | 1,270 mm |
| 75 in | 1,905 mm |
| 100 in | 2,540 mm |
| 250 in | 6,350 mm |
| 500 in | 12,700 mm |
| 1,000 in | 25,400 mm |