Square inch

Unit of area From Wikipedia, the free encyclopedia

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.[1] Pounds per square inch (psi), a unit of pressure, are derived from this unit of area.[2]

Unit systemImperial, United States customary units
Unitofarea
Symbolin2, sq in
Imperial/US   
  • ⁠1/144⁠ sq ft
  • ⁠1/1296⁠ sq yd
Quick facts General information, Unit system ...
square inch
Engineering paper, with the cropped scan depicting 24 square inches (25 smaller squares compose 1 square inch)
General information
Unit systemImperial, United States customary units
Unit ofarea
Symbolin2, sq in
Conversions
1 in2 in ...... is equal to ...
   Imperial/US   
  • ⁠1/144⁠ sq ft
  • ⁠1/1296⁠ sq yd
   SI units   
  • 6.4516 cm2
  • 6.4516×10−4 m2
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Representations

The following symbols are used to denote square inches:[1][2][3]

  • 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):[2][4][5]

  • 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)
  • ⁠π/4⁠ circular inches (1 circular inch is equal to ⁠4/π⁠ square inches)

References

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