Convert between metric and imperial length units, including millimeters (mm), meters (m), inches (in), feet (ft), and miles (mi). Length is a fundamental physical quantity measuring the distance between two points. The meter (m) is the SI base unit; imperial units are defined by exact conversion factors to SI (e.g. 1 in = 25.4 mm).
This length converter transforms values from Inches (in) to Millimeters (mm). Results update instantly using the exact conversion factor.
The inch (in) is an imperial length unit equal to exactly 25.4 mm (1 in = 0.0254 m).
The millimeter (mm) is one-thousandth of a meter (1 mm = 10⁻³ m).
1 in × 25.4 = 25.4 mm
mm = in × 25.4
To convert in to mm, multiply the value in in by 25.4 (conversion factor). Example: 1 in × 25.4 = 25.4 mm.
10 in × 25.4 = 254 mm
Common values from in to mm.
| in | 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 |