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]
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)
0.006 94 square feet (1 square foot is equal to 144 square inches)
0.000 771 604 9382square yards (1 square yard is equal to 1,296 square inches)
6.4516square centimetres (1 square centimetre is equal to 0.155 000 310... square inches)
0.000 645 16square metres (1 square metre is equal to 1,550.003 100... square inches)
π/4circular inches (1 circular inch is equal to 4/π square inches)
References
12Cardarelli, François (1997). Scientific Unit Conversion: A Practical Guide to Metrication. M. J. Shields. London: Springer London, Limited. ISBN978-1-4471-3394-0.
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