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For other uses, see Square (disambiguation).

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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
- inches², inch², in²

or in some cases "^2

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

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

- 0.006 94 square feet (1 square foot is equal to 144 square inches)
- 0.000 771 604 9382 square yards (1 square yard is equal to 1,296 square inches)
- 6.4516 square centimetres (1 square centimetre is equal to 0.155 000 310… square inches)
- 0.000 645 16 square metres (1 square metre is equal to 1,550.003 100… square inches)