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 |
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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
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)
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