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The square mile (abbreviated as sq&nbsp;mi and sometimes as mi<sup>2</sup>) 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

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

One square mile is equal to:

  • about four billion square inches
  • nearly 27.9 million square feet
  • nearly 3.1 million square yards
  • 2,560 roods
  • 640 acres

One square mile is also equivalent to:

  • nearly 2.59 million square meters
  • nearly 25.9 billion square centimeters
  • nearly 2.59 trillion square millimeters

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 ( × ) has an area of ; a rectangle of measuring × also has an area of , but is not 20 miles square.

Section

In the United States Public Land Survey System, "square mile" is an informal synonym for section.

References

  • Formula Conversion, Square miles to numerous area units with algebraic steps and unit cancellation shown