# Square mile

The **square mile** (abbreviated as **sq mi** and sometimes as **mi ^{2}**)[1] is an imperial and US unit of measure for area. One square mile is an area equal to the area of a square with sides of length 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:

- 2,589,988.1103360 square metres
- 258.99881103360 hectares
- 2.5899881103360 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 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

- 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.

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