This article does not cite any sources. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed.Find sources: "Square inch" – news · newspapers · books · scholar · JSTOR (December 2009) (Learn how and when to remove this template message)

A square inch (plural: square inches) is a unit of area, equal to the area of a square with sides of one inch. The following symbols are used to denote square inches:

The square inch is a common unit of measurement in the United States and the United Kingdom.

Equivalence with other units of area

1 square inch (assuming an international inch) is equal to: (the overbars indicate repeating decimals)