 Square mile

For other uses, see Square mile (disambiguation).
The square mile (abbreviated as sq mi and sometimes as mi^{2}) is an imperial and US unit of measure for an area equal to the area of a square of one statute mile.^{[1]} It should not be confused with miles square, which refers to the number of miles on each side squared. For instance, 20 miles square (20 × 20 miles) is equal to 400 square miles.
One square mile is equivalent to:
 4,014,489,600 square inches
 27,878,400 square feet
 3,097,600 square yards
 640 acres
 258.9988110336 hectares
 2560 roods
 25,899,881,103.36 square centimetres
 2,589,988.110336 square metres
 2.589988110336 square kilometres
References
 ^ Davies, Charles (1872). Mathematical dictionary and cyclopedia of mathematical science. Original from Harvard University: A.S. Barnes and co. p. 582. http://books.google.com/books?id=DoUMAAAAYAAJ.
Categories: Units of area
 Customary units in the United States
 Imperial units
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