Square inch

square inch
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

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)

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.

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