Millimetres to inches
Enter a value in millimetres to convert it to inches. 1 mm = 0.03937 in.
1 mm = 0.03937 in
Formula
in = mm ÷ 25.4
Worked example
10 mm ÷ 25.4 = 0.3937 in
Results on this page are rounded to 4 decimal places (4 significant figures below 1). Use the decimal places option above for a different rounding.
Millimetres to inches table
| Millimetres (mm) | Inches (in) |
|---|---|
| 1 mm | 0.03937 in |
| 2 mm | 0.07874 in |
| 5 mm | 0.1969 in |
| 10 mm | 0.3937 in |
| 15 mm | 0.5906 in |
| 20 mm | 0.7874 in |
| 25 mm | 0.9843 in |
| 50 mm | 1.9685 in |
| 75 mm | 2.9528 in |
| 100 mm | 3.937 in |
| 250 mm | 9.8425 in |
| 500 mm | 19.685 in |
| 1,000 mm | 39.3701 in |
Good to know
Every length is first turned into metres, then into the unit you picked. The inch is defined as exactly 2.54 cm, so a foot is exactly 0.3048 m and a mile is exactly 1,609.344 m. A nautical mile is 1,852 m.