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

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 mi × 20 mi) has an area of 400 sq mi; a rectangle of measuring 10 mi × 40 mi also has an area of 400 sq mi, 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. ^ 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. ^ 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.