Inch (in)
The inch is a unit of length, used for screen sizes, hardware fasteners, tire dimensions, and pipe diameters. Its symbol is in.
in
ft
1 inch equals
| Feet | 0.0833333 ft |
| Meters | 0.0254 m |
| Miles | 0.0000157828 mi |
| Kilometers | 0.0000254 km |
About the inch
The inch was historically defined as the width of a man's thumb. King Edward II of England decreed it as three barleycorns laid end to end in 1324.
In everyday use the inch appears in screen sizes, hardware fasteners, tire dimensions, and pipe diameters. As a point of reference: a standard smartphone screen is about 6 inches diagonally.