1 in = 25.4 mm. Type a number below for an instant result.
1 in = 25.4 mm; to convert, multiply the number of inches by 25.4
Length conversions come up when you follow measurements written in another system - product sizes, heights, room dimensions or distances.
Examples: 5 in = 127 mm; 10 in = 254 mm; 20 in = 508 mm.
| Inches (in) | Millimeters (mm) |
|---|---|
| 1 | 25.4 |
| 2 | 50.8 |
| 5 | 127 |
| 10 | 254 |
| 20 | 508 |
| 50 | 1,270 |
| 100 | 2,540 |
| 500 | 12,700 |
1 in equals 25.4 mm.
1 in = 25.4 mm; to convert, multiply the number of inches by 25.4.
10 in = 254 mm.
Yes. Use the swap button in the converter above, or open the reverse page for a chart in the opposite direction.
It uses the exact standard conversion factors and shows up to four or five meaningful decimals. For critical engineering or scientific work, check the rounding your application requires.