Convert square kilometers to square feet instantly.
Definition: A square kilometer (symbol: km²) is the area of a square with sides of one kilometer. It equals exactly one million square meters.
History/origin: The square kilometer became a standard large-area metric unit as governments, cartographers, and geographers needed a practical way to measure cities, forests, and regions.
Current use: Square kilometers are used for the area of cities, lakes, countries, parks, and large land or water regions.
Definition: The square foot measures area using a 12-inch by 12-inch square. By international agreement, one ft² is exactly 0.09290304 m².
History/origin: Foot-based area took hold in building trades because room dimensions were already measured in feet, making ft² a practical unit for floors, walls, and property.
Current use: Ft² shows up in home listings, rental ads, office planning, tile and carpet orders, roofing quotes, HVAC sizing, and many North American construction documents.
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