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1 inch (in) = 25.4 millimeters (mm). To convert inches to mm, multiply the length value by the conversion factor 25.4.
Number of inches × 25.4 = Value in millimeters
1 inch = 1 × 25.4 = 25.4 mm
| Inches [in] | Millimeters [mm] |
| 1 | 25.4 |
| 2 | 50.8 |
| 3 | 76.2 |
| 4 | 101.6 |
| 5 | 127 |
| 6 | 152.4 |
| 7 | 177.8 |
| 8 | 203.2 |
| 9 | 228.6 |
| 10 | 254 |
| 11 | 279.4 |
| 12 | 304.8 |
| 13 | 330.2 |
| 14 | 355.6 |
| 15 | 381 |
| 16 | 406.4 |
| 17 | 431.8 |
| 18 | 457.2 |
| 19 | 482.6 |
| 20 | 508 |
How many millimeters are there in an inch?
There are 25.4 millimeters in an inch.
Which is the bigger unit?
Inch is the bigger unit than millimeter.