Convert millimeters to inches (mm to inches) using 1 inch = 25.4 mm, so inches = mm ÷ 25.4. Handy for tools, drill bits and engineering drawings. This chart shows common millimeter values in inches.
| Millimeters (mm) | Inches (in) |
|---|---|
| 1 | 0.0394 |
| 2 | 0.0787 |
| 3 | 0.1181 |
| 4 | 0.1575 |
| 5 | 0.1969 |
| 6 | 0.2362 |
| 7 | 0.2756 |
| 8 | 0.315 |
| 9 | 0.3543 |
| 10 | 0.3937 |
| 11 | 0.4331 |
| 12 | 0.4724 |
| 13 | 0.5118 |
| 14 | 0.5512 |
| 15 | 0.5906 |
| 16 | 0.6299 |
| 17 | 0.6693 |
| 18 | 0.7087 |
| 19 | 0.748 |
| 20 | 0.7874 |
| 21 | 0.8268 |
| 22 | 0.8661 |
| 23 | 0.9055 |
| 24 | 0.9449 |
| 25 | 0.9843 |
| 26 | 1.0236 |
| 27 | 1.063 |
| 28 | 1.1024 |
| 29 | 1.1417 |
| 30 | 1.1811 |
| 40 | 1.5748 |
| 50 | 1.9685 |
| 60 | 2.3622 |
| 80 | 3.1496 |
| 100 | 3.937 |
| 150 | 5.9055 |
| 200 | 7.874 |
| 250 | 9.8425 |
| 300 | 11.811 |
Formula
inches = millimeters ÷ 25.4. For example, 50 mm ÷ 25.4 = 1.9685 in.