Square Mile [mi²]
A square mile (mi²) is a unit of area used primarily in the United States and the UK to measure large land areas. It represents a square that is one mile long on each side.
1 square mile = 2.59 square kilometers = 640 acres.
Square miles are commonly used to describe the size of cities, counties, and large geographic regions.
Square Foot (US Survey)
The square foot (US survey) is a unit of area based on the US survey foot, which is slightly longer than the international foot. It is mainly used in land surveying and mapping in the United States.
1 US survey foot = 1200⁄3937 meters (approximately 0.3048006096 m)
1 square foot (US survey) ≈ 0.0929034116 m²
This unit helps maintain consistency in US land measurements, especially in legal and cadastral contexts.