Millimeters to Inches Converter
Divide millimeters by 25.4 to get inches.
Formula
1 mm = 0.0393700787 in
inches = millimeters ÷ 25.4
Worked example
Convert 25 millimeters to inches
- Divide by 25.4
- 25 ÷ 25.4 = 0.984252
25 mm = 0.984252 in
Good to know
Engineers and makers often need the nearest fractional inch: 3 mm ≈ 1/8 in (3.175 mm), 6 mm ≈ 1/4 in (6.35 mm), 13 mm ≈ 1/2 in (12.7 mm) and 19 mm ≈ 3/4 in (19.05 mm). These are close but not interchangeable for tight fits such as wrenches and bearings. Rainfall reported as 25 mm is just under an inch.
Conversion table
| Millimeters (mm) | Inches (in) |
|---|---|
| 1 | 0.0393701 |
| 2 | 0.0787402 |
| 3 | 0.11811 |
| 5 | 0.19685 |
| 6 | 0.23622 |
| 8 | 0.314961 |
| 10 | 0.393701 |
| 12 | 0.472441 |
| 13 | 0.511811 |
| 15 | 0.590551 |
| 19 | 0.748031 |
| 20 | 0.787402 |
| 25 | 0.984252 |
| 30 | 1.1811 |
| 50 | 1.9685 |
| 100 | 3.93701 |
About these units
- Millimeter (mm)
- One thousandth of a meter. Common on rulers, engineering drawings, screws and rainfall figures.
- Inch (in)
- Exactly 2.54 cm since the 1959 international yard and pound agreement. There are 12 inches in a foot.