The square mile (abbreviated as sq mi and sometimes as mi2)[1] is an imperial and US unit of measure for an area equal to the area of a square of one statute mile.[2] 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[3]
  • 27,878,400 square feet[3]
  • 3,097,600 square yards[3]
  • 640 acres[1]
  • 258.9988110336 hectares
  • 2560 roods[4]
  • 25,899,881,103.36 square centimetres
  • 2,589,988.110336 square metres
  • 2.589988110336 square kilometres

When applied to a portion of the earth's surface, which is curved rather than flat, "square mile" is an informal synonym for section.


  1. ^ a b Rowlett, Russ (September 1, 2004). "S", How Many? A Dictionary of Units of Measurement. University of North Carolina at Chapel Hill. Retrieved February 22, 2012.
  2. ^ Davies, Charles (1872). Mathematical dictionary and cyclopedia of mathematical science. Original from Harvard University: A.S. Barnes and co. p. 582. 
  3. ^ a b c François Cardarelli (2003). Encyclopaedia of scientific units, weights, and measures: their SI equivalences and origins. Springer. p. 3. ISBN 978-1-85233-682-0. Retrieved 22 February 2012. 
  4. ^ Zupko, Ronald Edward (1985). A dictionary of weights and measures for the British Isles: the Middle Ages to the twentieth century. American Philosophical Society. p. 353. ISBN 978-0-87169-168-2. Retrieved 22 February 2012. 

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