Convert Millimeter to Inch
Use this free converter to change millimeters (mm) into inches (in). Millimeter and inch both measure length. As a quick reference, 1 mm equals 0.039370079 in, and 1 in equals 25.4 mm.
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Inch (in)
0.039370079
1 mm = 0.039370079 in
Length conversion table
| Millimeter | Inch |
|---|---|
| 0.01 | 0.00039370079 |
| 0.1 | 0.0039370079 |
| 0.5 | 0.019685039 |
| 1 | 0.039370079 |
| 2 | 0.078740157 |
| 3 | 0.11811024 |
| 5 | 0.19685039 |
| 10 | 0.39370079 |
| 20 | 0.78740157 |
| 25 | 0.98425197 |
| 50 | 1.9685039 |
| 100 | 3.9370079 |
| 1,000 | 39.370079 |
How to convert Millimeter to Inch
Multiply the millimeter value by 0.039370079 to get inches.
- Enter the number of millimeters you want to convert.
- The converter instantly shows the equivalent value in inches.
- Worked example: 15 mm × 0.039370079 = 0.59055118 in.
- Use the swap button to reverse the conversion (inch to millimeter).
About these units
Millimeter (mm)
- Definition
- A millimeter (mm) is one thousandth of a meter, used where small, precise measurements are needed.
- History
- Like other metric subdivisions it was defined in the 1790s using the prefix "milli-" (one thousandth).
- Current use
- Engineers, machinists, and manufacturers specify tolerances in millimeters, and rainfall is commonly reported in mm.
Inch (in)
- Definition
- An inch (in) is an imperial unit of length equal to exactly 2.54 centimeters, with twelve inches making a foot.
- History
- Originally the width of a thumb, the inch was standardised to 25.4 mm internationally in 1959.
- Current use
- Inches measure screen sizes, tyre and pipe dimensions, and everyday lengths in the US and UK.
Frequently asked questions
How many inches are in a millimeter?
There are 0.039370079 in in 1 mm. To convert, multiply the number of millimeters by 0.039370079.
How do I convert millimeters to inches?
Multiply the millimeter value by 0.039370079 to get inches. For example, 10 mm = 0.39370079 in.
Is this millimeter-to-inch converter free?
Yes. This converter is completely free, runs entirely in your browser, and requires no sign-up. Your inputs never leave your device.
Convert Millimeter to other length units
| Unit | 1 Millimeter equals |
|---|---|
| Meter (m) | 0.001 m |
| Kilometer (km) | 0.000001 km |
| Centimeter (cm) | 0.1 cm |
| Micrometer (µm) | 1000 µm |
| Nanometer (nm) | 1000000 nm |
| Mile (mi) | 6.2137e-7 mi |
| Yard (yd) | 0.0010936133 yd |
| Foot (ft) | 0.0032808399 ft |
| Inch (in) | 0.039370079 in |
| Nautical Mile (nmi) | 5.3996e-7 nmi |
| Light Year (ly) | 1.0570e-19 ly |