Square mile, unit of area measurement acknowledged in both the imperial and the US measurement systems, is equal to a square measuring one mile on each side. A square mile which is often abbreviated as sq. mi and mi2, is equal to 2.59 square kilometres. It is worth mentioning here that the unit should not be considered to be the same as confused miles square, a unit that refers to a square region, with each side having a specified length.
Square mile is also a standard unit to calculate population numbers in a specific area. So the population numbers are often described in per square mile terms. The total population number in a square mile is calculated by dividing the total number of residents by the number of square miles of area.
The business and financial district of London is also known as the Square Mile.
1 square mile is:
27,878,400 square feet
3,097,600 square yards
25,899,881,103.36 square centimetres
2,589,988.110336 square metres
2.589988110336 square kilometres
4,014,489,600 square inches