# Square mile

*This article is about the unit of measure. In England,***the Square Mile**is a traditional name for the City of London.

**square mile**(symbol

**sq. mi.**or

**mi²**) is an imperial unit which is the area of a square whose side is one mile (or 5,280 feet). A square mile is equal to 27,878,400 square feet, 640 acres, or roughly 2½ square kilometres; (2.589988 km², to be more exact). Note that the abbreviation

*sq. mi.*is more common than

*mi²*, as the use of a superscript

*2*to indicate a squared unit is more common with SI units.

*See also*: Conversion of units