Type a value to convert inches to millimetres instantly. This free converter shows the formula and a quick reference table, and the box works both ways — edit either side.
1 in = 25.4 mm · Open the full converter →
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To convert inches to millimetres, multiply the inche value by 25.4. So millimetres = inches × 25.4. For example, 6 in = 152.4 mm. To go the other way, divide by the same number.
| Inches (in) | Millimetres (mm) |
|---|---|
| 1 in | 25.4 mm |
| 2 in | 50.8 mm |
| 5 in | 127 mm |
| 6 in | 152.4 mm |
| 10 in | 254 mm |
| 12 in | 304.8 mm |
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