Square mile

square mile
Midway International Airport is about 650 acres (1.02 mi2) in area.
General information
Unit systemImperial, United States customary units
Unit ofarea
Symbolmi2, 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) 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.

Equivalents

Various units of area, with square mile being represented as a yellow square

One square mile is equal to:

One square mile is also equivalent to:

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

  1. ↑ "FAA Airport Form 5010 for MDW" (PDF). FAA. . effective February 19, 2026.
  2. ↑ 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.
  3. ↑ Davies, Charles (1872). Mathematical dictionary and cyclopedia of mathematical science. Original from Harvard University: A.S. Barnes and co. p. 582.
  4. ↑ 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.