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The square mile is an imperial and US unit of measure for an area equal to the area of a square of one statute mile. It should not be confused with miles square, which refers to the number of miles on each side squared. For instance, 20 miles square (20×20 miles) is equal to 400 square miles.
| 1 square mile | = 640 acres |
| = 27,878,400 square feet | |
| = 2.589988110336 square kilometers (exactly) | |
| ≈ 260 hectares |
1 square mile is equivalent to:
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In the Public Land Survey System of the U.S. and the Dominion Land Survey of Canada, the size of a standard section of land is one square mile, but always with the marginally larger survey definition.