How to convert inches to millimeters
1 inch is equal to 25.4 millimeters, and 1 millimeter is equal to 0.03937007874 inches. To convert, multiply by the conversion factor:
millimeters = inches × 25.4
millimeters = inches ÷ 0.03937007874Example: convert 15 in to mm: 15 × 25.4 = 381 mm.
Inch to Millimeter conversion table
| Inch (in) | Millimeter (mm) |
|---|---|
| 0.01 in | 0.254 mm |
| 0.1 in | 2.54 mm |
| 1 in | 25.4 mm |
| 2 in | 50.8 mm |
| 3 in | 76.2 mm |
| 5 in | 127 mm |
| 10 in | 254 mm |
| 20 in | 508 mm |
| 50 in | 1,270 mm |
| 100 in | 2,540 mm |
| 250 in | 6,350 mm |
| 500 in | 12,700 mm |
| 1,000 in | 25,400 mm |
About the inch
The inch is defined as exactly 2.54 cm. It's used in the US and UK for screen sizes, tools, construction and personal height.
Symbol: in · 1 in = 0.0254 m · Category: Imperial & US customary
About the millimeter
A millimeter is one thousandth of a meter. It's the standard unit in engineering drawings, manufacturing, rainfall and screen and paper sizes.
Symbol: mm · 1 mm = 0.001 m · Category: Metric (SI)