Unit Converter › Length › in → mm
Length · scale · base metre
in to mm
1 inch (in) = 25.4 mm. Multiply by 25.4. One inch (in) is 25.4 mm.
Convert
scale · base metre
—
| Every unit at once | Value | Unit |
|---|
in to mm table
| inch (in) | mm | Unit |
|---|---|---|
| 1 in | 25.4 | mm |
| 2 in | 50.8 | mm |
| 3 in | 76.2 | mm |
| 5 in | 127 | mm |
| 10 in | 254 | mm |
| 20 in | 508 | mm |
| 25 in | 635 | mm |
| 50 in | 1,270 | mm |
| 100 in | 2,540 | mm |
| 500 in | 12,700 | mm |
| 1,000 in | 25,400 | mm |
exact by definition
The inch has been exactly 25.4 mm since 1959, which makes the foot, yard and mile exact too.