Square mile

square mile
Aerial photograph of Indiana farmland, with each small square being one square mile. (see Section (United States land surveying))
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 sq ft
  • 3.0976×106 sq yd
  • 640 acres
   SI units   
  • 2.59×106 m2
  • 2.59 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.

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