This tool converts inches to mm the moment you type — 1 in = 25.4 mm. It's the same trusted math behind the full unit converter, focused on the single inches-to-millimeters conversion so you get the answer without any distractions.
To convert inches to millimeters, multiply the number of inches by 25.4. Every calculation runs client-side, so your numbers never leave your device, and there's no sign-up, no limit, and nothing to install.
| inches (in) | millimeters (mm) |
|---|---|
| 1 in | 25.4 mm |
| 2 in | 50.8 mm |
| 3 in | 76.2 mm |
| 5 in | 127 mm |
| 10 in | 254 mm |
| 25 in | 635 mm |
| 50 in | 1,270 mm |
| 100 in | 2,540 mm |
Need a different conversion? See all unit converters.
Found something broken, have an idea, or just want to say thanks about any of our tools? Every message reaches a real person.