Convert mm to in instantly — formula, worked examples and a conversion table of common values.
Convert millimetres (mm) to inches (in). Enter a value on either side and the other updates instantly — nothing is sent to a server.
One millimetre equals 0.03937 in. The table below lists the values people look up most often, and each one links to a page with the worked calculation.
in = mm ÷ 25.4| Millimetre (mm) | Inch (in) |
|---|---|
| 0.1 | 0.00393701 |
| 0.5 | 0.019685 |
| 1 | 0.0393701 |
| 2 | 0.0787402 |
| 3 | 0.11811 |
| 5 | 0.19685 |
| 10 | 0.393701 |
| 15 | 0.590551 |
| 20 | 0.787402 |
| 25 | 0.984252 |
| 50 | 1.9685 |
| 75 | 2.95276 |
| 100 | 3.93701 |
| 250 | 9.84252 |
| 500 | 19.685 |
| 1,000 | 39.3701 |
1 millimetre = 0.03937 in.
10 mm = 0.3937 in.
100 mm = 3.937 in.
Use the formula in = mm ÷ 25.4. Or type any value into the converter above — it works in both directions.