Square inch

Template:Short description {{#invoke:other uses|otheruses}} Template:Infobox unit

A square inch (plural: square inches) 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.<ref name=":0">Template:Cite book</ref> Pounds per square inch (psi), a unit of pressure, are derived from this unit of area.<ref name=":1">Template:Cite book</ref>

Representations

The following symbols are used to denote square inches:<ref name=":0" /><ref name=":1" /><ref>Template:Cite journal</ref>

• square in
• sq inches, sq inch, sq in
• inches/-2, inch/-2, in/-2
• inches^2, inch^2, in^2
• inches², inch², in² (also denoted by "²)
• historic usage ^□″ (number with a square & a double apostrophe, both as an exponent)

Equivalence with other units of area

1 square international inch is equal to (the overbars indicate repeating decimals):<ref name=":1" /><ref>Template:US Code</ref><ref>Template:Cite book</ref>

• Template:Nowrap square feet (1 square foot is equal to 144 square inches)
• Template:Nowrap square yards (1 square yard is equal to 1,296 square inches)
• Template:Nowrap square centimetres (1 square centimetre is equal to Template:Nowrap square inches)
• Template:Nowrap square metres (1 square metre is equal to Template:Nowrap square inches)
• Template:Math circular inches (1 circular inch is equal to Template:Math square inches)