Convert millimeters to inches instantly. Free online mm to in converter with accurate results and formula explanation.
Formula
in = mm ÷ 25.4The millimeter (mm) is a metric unit of length commonly used for precision measurements, while the inch (in) is an imperial unit used primarily in the US. Converting millimeters to inches is essential in engineering, manufacturing, and DIY projects where specifications come from different measurement systems.
in = mm ÷ 25.4To convert millimeters to inches, divide by 25.4. This is an exact conversion since 1 inch is internationally defined as exactly 25.4 millimeters.
| Input | Output |
|---|---|
| 1 mm | 0.0393701 in |
| 10 mm | 0.393701 in |
| 25.4 mm | 1 in |
| 50 mm | 1.9685 in |
| 100 mm | 3.93701 in |