Square mile

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.

Conversions
1 square mile is equivalent to:
 * 4,014,489,600 square inches
 * 27,878,400 square feet
 * 3,097,600 square yards
 * 640 acres
 * 2560 roods
 * 25,899,881,103.36 square centimeters
 * 2,589,988.110336 square meters
 * 2.589988110336 square kilometers