Inches (in) to Millimeters (mm) Conversion
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
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 (in) | Millimeters (mm) |
|---|---|
| 0.1 in | 2.54 mm |
| 1 in | 25.40 mm |
| 2 in | 50.80 mm |
| 3 in | 76.20 mm |
| 5 in | 127.00 mm |
| 10 in | 254.00 mm |
| 20 in | 508.00 mm |
| 30 in | 762.00 mm |
| 50 in | 1,270.00 mm |
| 100 in | 2,540.00 mm |
| 1000 in | 25,400.00 mm |
Frequently Asked Questions (FAQ)
How many millimeters are in 1 inches?
1 inches (in) is exactly 25.400 millimeters (mm).
How do I convert inches to millimeters?
Multiply the value in inches by 25.400 to get the result in millimeters. Or use the converter above — type any number and see the result instantly.