Square Foot to Square Mile Converter

A square foot (ft²) is a unit of area equal to the area of a square with sides of one foot each. It equals 144 square inches or approximately 0.093 square meters, making it one of the most commonly used area units in imperial systems.

The square foot developed from the English foot, which has ancient origins based on human body measurements. As the foot became standardized (defined as exactly 0.3048 meters in 1959), the square foot became the primary unit for measuring building areas, rooms, and properties in countries using imperial units.

Square feet are extensively used in the United States for measuring floor areas, room sizes, apartments, houses, and commercial spaces. They're standard in real estate listings, construction specifications, HVAC calculations, and building codes. Most American property measurements use square feet.

A square mile (mi²) is a unit of area equal to the area of a square with sides of one mile each. It equals 640 acres or approximately 2.59 square kilometers, making it suitable for measuring large geographical areas.

The square mile developed from the English mile, which was standardized in 1593. As territorial expansion and land surveying became important in English-speaking countries, particularly in North America, the square mile became a standard unit for measuring large land areas and territories.

Square miles are primarily used in the United States and United Kingdom for measuring counties, states, large properties, and geographical features. They're standard in American atlases, real estate for large properties, and government land management. Many US states report their area in square miles.