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:

• square in
• sq inches, sq inch, sq in
• inches/-2, inch/-2, in/-2
• inches^2, inch^2, in^2
• inches˛, inch˛, in˛

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)

• square feet (1 square foot is equal to 144 square inches)
• square yards (1 square yard is equal to 1,296 square inches)
• square centimetres (1 square centimetre is equal to square inches)
• square metres (1 square metre is equal to square inches)

See also

• 1 E-1 m˛ for a comparison with other areas
• Cubic inch
• Orders of magnitude (area)
• Conversion of units
• Area (geometry)
• Square (algebra), square root

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