Unit converter
Millimeters to Inches Converter
Convert millimeters to inches using the exact definition: 25.4 mm equals one inch. This is the precise factor for machining, printing, and any technical measurement.
Formula
in = mm ÷ 25.4
Example: 50 mm ÷ 25.4 ≈ 1.9685 in.
Millimeters to Inches conversion chart
| Millimeters (mm) | Inches (in) |
|---|---|
| 1 mm | 0.0394 in |
| 2 mm | 0.0787 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 |
| 30 mm | 1.1811 in |
| 50 mm | 1.9685 in |
| 75 mm | 2.9528 in |
| 100 mm | 3.937 in |
| 150 mm | 5.9055 in |
| 200 mm | 7.874 in |
| 250 mm | 9.8425 in |
| 500 mm | 19.685 in |
Frequently asked questions
- How many inches are in a millimeter?
- One millimeter equals about 0.03937 inches.
- How many mm in 1 inch?
- Exactly 25.4 mm, defined internationally in 1959.
- Is a 5 mm hex key the same as a 3/16 in hex key?
- Very close — 5 mm is about 0.1969 in and 3/16 in is 0.1875 in, so they are not interchangeable in tight-tolerance work.
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Inches → MillimetersRelated conversions