Convert inch to millimeter
1 in = 25.4 mm
1 in = 25.4 mm
1 in in every length unit
| femtometer | 25,400,000,000,000 fm |
| picometer | 25,400,000,000 pm |
| nanometer | 25,400,000 nm |
| micrometer | 25,400 μm |
| millimeter | 25.4 mm |
| centimeter | 2.54 cm |
| decimeter | 0.254 dm |
| meter | 0.0254 m |
| kilometer | 0.0000254 km |
| inch | 1 in |
| foot | 0.0833 ft |
| yard | 0.0278 yd |
| mile | 0.0000158 mi |
| nautical mile | 0.0000137 nmi |
| astronomical unit | 1.70e-13 AU |
| light-year | 2.68e-18 ly |
| parsec | 8.23e-19 pc |
How the conversion works
Multiply by 25.4 to go from inch to millimeter, or divide by it to go back. Every conversion on this site routes through the SI value (m) rather than a table of pairwise factors, so a round-trip returns exactly what you started with.
Going the other way? millimeter to inch — 1 mm = 0.03937007874 in.
inch to millimeter — common values
| 1 in | 25.4 mm |
| 2 in | 50.8 mm |
| 3 in | 76.2 mm |
| 5 in | 127 mm |
| 10 in | 254 mm |
| 15 in | 381 mm |
| 20 in | 508 mm |
| 25 in | 635 mm |
| 50 in | 1,270 mm |
| 75 in | 1,905 mm |
| 100 in | 2,540 mm |
| 250 in | 6,350 mm |
| 500 in | 12,700 mm |
| 1000 in | 25,400 mm |
Solvers that use length