Convert Millimeter to Inch
Instant mm to in conversion
0.03937007874
Inch = Millimeter ÷ 25.4
Formula
Inch = Millimeter ÷ 25.4
Millimeters are the unit of choice for precision measurements — screws, drill bits, bolt sizes, engineering tolerances, and technical drawings. Inches (and fractions of inches) are the standard in US manufacturing and hardware. The conversion is essential for working across metric and imperial tools.
Divide millimeters by 25.4 to get inches. A 10 mm bolt is roughly 3/8 inch.
Millimeter to Inch Conversion Table
| Millimeter (mm) | Inch (in) |
|---|---|
| 0.5 | 0.01968503937 |
| 1 | 0.03937007874 |
| 2 | 0.07874015748 |
| 5 | 0.1968503937 |
| 10 | 0.3937007874 |
| 20 | 0.7874015748 |
| 50 | 1.968503937 |
| 100 | 3.937007874 |
| 500 | 19.68503937 |
| 1000 | 39.37007874 |