Millimeters (mm) to Inches (in) Conversion
Millimeters
The millimetre is a unit of length equal to one thousandth of a metre (10⁻³ m), derived using the SI prefix milli- (from Latin mille, thousand). It is the standard unit for precision measurements in engineering, manufacturing, and medicine, where tolerances are routinely specified to the nearest millimetre or fraction thereof. In meteorology, rainfall is universally measured in millimetres, where 1 mm of rainfall corresponds to 1 litre of water per square metre of surface area.
Inches
The inch is a unit of length equal to exactly 25.4 millimetres, standardised under the international yard and pound agreement of 1959. It is the standard unit for screen diagonal measurements in consumer electronics, tire widths, pipe diameters in plumbing, and calibre in firearms. In typography, one inch contains exactly 72 PostScript points, fundamental to digital print and graphic design.
| Millimeters (mm) | Inches (in) |
|---|---|
| 0.1 mm | 0.00394 in |
| 1 mm | 0.0394 in |
| 2 mm | 0.0787 in |
| 3 mm | 0.1181 in |
| 5 mm | 0.1969 in |
| 10 mm | 0.3937 in |
| 20 mm | 0.7874 in |
| 30 mm | 1.1811 in |
| 50 mm | 1.9685 in |
| 100 mm | 3.937 in |
| 1000 mm | 39.3701 in |
Frequently Asked Questions (FAQ)
How many inches are in 1 millimeters?
1 millimeters (mm) is exactly 0.03937 inches (in).
How do I convert millimeters to inches?
Multiply the value in millimeters by 0.03937 to get the result in inches. Or use the converter above — type any number and see the result instantly.