Inches to Millimetres Converter
This free length converter converts Inches (in) to Millimetres (mm) and back again. The exact conversion factor is 1 in = 25.4 mm, so 10 in equals 254 mm.
Type a value in either field — the result updates in real time. The reference table below shows common conversion values at a glance. All calculations run entirely in your browser with no data sent to any server.
| Inches (in) | Millimetres (mm) |
|---|---|
| 1 in | 25.4 mm |
| 5 in | 127 mm |
| 10 in | 254 mm |
| 100 in | 2540 mm |