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 (also denoted by "2)
- historic engineering drawings □″ (number with a square & a double apostrophe, both as an exponent)
| square inch | |
|---|---|
| Unit system | Imperial, United States customary units |
| Unit of | area |
| Symbol | in2, sq in |
| Conversions | |
| 1 in2 in ... | ... is equal to ... |
| Imperial/US |
|
| SI units |
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The square inch is a common unit of measurement in the United States and the United Kingdom. A common unit of pressure, pound per square inch (psi) is derived from this unit of area.
Equivalence with other units of area
edit1 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)