Square inch
A square inch is a unit of area, equal to the area of a square with sides of one inch. The square inch is a common unit of measurement in the United States and the United Kingdom. Pounds per square inch, a unit of pressure, are derived from this unit of area.
Representations
The following symbols are used to denote square inches:- square in
- sq inches, sq inch, sq in
- inches/-2, inch/-2, in/-2
- inches^2, inch^2, in^2
- inches2, inch2, in2
- historic usage □″
Equivalence with other units of area