Convert square miles to hectares 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 hectare is a large metric land unit. It equals 10,000 m², so a square plot 100 meters on each side has an area of one hectare.
History/origin: Metric land measurement needed a unit more manageable than square meters for fields and estates, and the hectare filled that role through the are-based metric system.
Current use: Ha is common in agricultural reports, conservation areas, forestry, vineyards, land registries, planning documents, and international comparisons of property or habitat size.
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