The square mile (abbreviated as sq mi and sometimes as mi2) is an imperial and US unit of measure for an area equal to the area of a square of one statute mile. 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; an area of 10 × 40 miles is likewise 400 square miles, but it is not 20 miles square.
One square mile is equal to:
- 4,014,489,600 square inches
- 27,878,400 square feet
- 3,097,600 square yards
- 640 acres
- 2560 roods
A square mile is equivalent to the following metric system measures:-
- 25,899,881,103.36 square centimetres
- 2,589,988.110336 square metres
- 258.9988110336 hectares
- 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.
- 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.
- Davies, Charles (1872). Mathematical dictionary and cyclopedia of mathematical science. Original from Harvard University: A.S. Barnes and co. p. 582.
- 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.
- 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.
- Formula Conversion, Square miles to numerous area units with algebraic steps and unit cancellation shown
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