Square mile

square mile
square mile
	An aerial photograph of farmland in Indiana, with each small square being one square mile. (see Section (United States land surveying))
General information
Unit system	Imperial, United States customary units
Unit of	area
Symbol	mi2, sq mi
Conversions
1 mi2 in ...	... is equal to ...
Imperial/US	4.0145×109 sq in; 2.7878×107 ft2; 3.0976×106 yd2; 640 acres;
SI units	2589988.110336 m2; 2.589988110336 km2;

The square mile (abbreviated as sq mi and sometimes as mi²)^[1] is an imperial and US unit of measure for area. One square mile is equal to the area of a square with each side measuring a length of one mile.^[2]

Equivalents

One square mile is equal to:

4,014,489,600 square inches^[3]
27,878,400 square feet
3,097,600 square yards
2,560 roods
640 acres

One square mile is also equivalent to:

2,589,988.110336 square metres
258.9988110336 hectares
2.589988110336 square kilometres

Similarly named units

Miles square

Square miles should not be confused with miles square, a square region with each side having a length of the value given. For example, a region which is 20 miles square (20 miles × 20 miles) has an area of 400 mi²; a rectangle of measuring 10 miles × 40 miles also has an area of 400 mi², but is not 20 miles square.

Section

In the United States Public Land Survey System, "square mile" is an informal synonym for section.

References

↑ 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.

Formula Conversion, Square miles to numerous area units with algebraic steps and unit cancellation shown

[RussRowlett-1] 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-2] Davies, Charles (1872). Mathematical dictionary and cyclopedia of mathematical science. Original from Harvard University: A.S. Barnes and co. p. 582.

[Cardarelli20032-3] 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.

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