Whether you are drill bits, hardware and small parts in metric, converting Inch to Millimeter by hand is easy to get wrong. This free converter gives you an instant, exact answer — 1 in = 25.4 mm — and runs entirely in your browser.
How to convert Inch to Millimeter
To convert a value from in to mm, multiply it by the conversion factor 25.4. For example: 127 mm equals 5 × 25.4, and 1270 mm equals 50 × 25.4.
Going the other way, use the Millimeter to Inch converter.
Inch to Millimeter conversion table
| Inch (in) | Millimeter (mm) |
|---|---|
| 1 | 25.4 |
| 2 | 50.8 |
| 3 | 76.2 |
| 5 | 127 |
| 10 | 254 |
| 25 | 635 |
| 50 | 1270 |
| 100 | 2540 |
Other length conversions
- Centimeter to Inch
- Inch to Centimeter
- Meter to Foot
- Foot to Meter
- Kilometer to Mile
- Mile to Kilometer
- Yard to Meter
- Centimeter to Foot
Why use the HandyTools converter
Most unit converters upload your values to a server or bury you in ads. HandyTools performs the in-to-mm conversion locally on your device with instant bidirectional results — type in either box and both update at once. There is nothing to install, nothing to sign up for, and your numbers never leave your browser.