Square miles (mi²) to Square millimeters (mm²) Conversion

Square miles

The square mile is a unit of area equal to exactly 2,589,988.110336 square metres (approximately 2.59 km²). It is the standard unit for measuring large land areas, population density, and political jurisdictions in the United States and United Kingdom. One square mile contains exactly 640 acres — the basis of the US Public Land Survey System that structured much of North American land division.

Square millimeters

The square millimetre is a unit of area equal to one millionth of a square metre (10⁻⁶ m²). In engineering, cross-sectional areas of wires and cables are standardised in square millimetres — electrical cable ratings specify conductor cross-sections in mm² (e.g., 1.5 mm², 2.5 mm², 4 mm²). In materials testing, stress is calculated as force per unit area in megapascals, where the area is expressed in square millimetres.

Convert Square miles (mi²) to other units of Area