Convert square miles to square kilometers instantly.
Definition: A square mile (symbol: mi²) is the area of a square with sides of one mile. It equals 640 acres or about 2.58999 square kilometers.
History/origin: The square mile became a standard large-area imperial unit for surveying, regional mapping, and land administration in the UK and the United States.
Current use: Square miles are used mainly in the United States and UK contexts for counties, cities, lakes, parks, and other large geographic areas.
Definition: The square kilometer covers a large metric area: one kilometer by one kilometer. Since each side is 1,000 meters, one km² contains 1,000,000 m².
History/origin: Large-scale mapping and public statistics needed a unit bigger than hectares or square meters, so km² became the common metric choice for regions and natural features.
Current use: Km² appears in geography, census tables, environmental reports, park descriptions, city profiles, and comparisons of islands, watersheds, forests, and countries.
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