How to convert millimeters to inches
One millimeter equals 0.03937 inches, so multiply the value in millimeters by 0.03937007874: in = mm × 0.03937007874. Equivalently, divide by 25.4.
Example: 10 mm = 10 × 0.03937007874 = 0.3937 in.
Millimeters to inches table
| Millimeters (mm) | Inches (in) |
|---|---|
| 0.1 | 0.003937 |
| 0.5 | 0.01969 |
| 1 | 0.03937 |
| 2 | 0.07874 |
| 3 | 0.1181 |
| 4 | 0.1575 |
| 5 | 0.1969 |
| 6 | 0.2362 |
| 7 | 0.2756 |
| 8 | 0.315 |
| 9 | 0.3543 |
| 10 | 0.3937 |
| 15 | 0.5906 |
| 20 | 0.7874 |
| 25 | 0.9843 |
| 30 | 1.1811 |
| 40 | 1.5748 |
| 50 | 1.9685 |
| 75 | 2.9528 |
| 100 | 3.937 |
| 250 | 9.8425 |
| 500 | 19.685 |
| 1,000 | 39.3701 |
About the units
- Millimeter (mm): One thousandth of a meter — the standard unit on engineering drawings and for screen sizes in specs.
- Inch (in): Exactly 2.54 cm by international agreement (1959); used for screens, tools and US measurements.
Need the other direction? Convert inches to millimeters — 1 inch = 25.4 millimeters.
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Open the unit converter Frequently asked questions
How many inches are in a millimeter?
1 millimeter = 0.03937 inches.
What is the formula for millimeters to inches?
in = mm × 0.03937007874.
How much is 10 mm in in?
10 mm = 0.3937 in.