Convert acre to square kilometer
Please provide values below to convert acre [ac] to square kilometer [km^2], or Convert square kilometer to acre.
How to Convert Acre to Square Kilometer
1 ac = 0.0040468564224 km^2
Example: convert 15 ac to km^2:
15 ac = 15 × 0.0040468564224 km^2 = 0.060702846336 km^2
Acre to Square Kilometer Conversion Table
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Acre
An acre is a unit of area commonly used in the United States and the UK, equal to 43,560 square feet or approximately 4,047 square meters.
History/Origin
The acre originated in medieval England as a measure of land area that could be plowed in one day with a yoke of oxen. It was standardized in the 19th century and has since been used primarily for measuring land, especially in agriculture.
Current Use
Today, the acre is primarily used in real estate, agriculture, and land planning in the United States, the UK, and other countries that use imperial or customary units.
Square Kilometer
A square kilometer is a unit of area equal to the area of a square with sides measuring one kilometer each.
History/Origin
The square kilometer has been used as a standard unit of area measurement in the metric system since its adoption, primarily for measuring large land areas such as countries and regions.
Current Use
It is commonly used in geography, urban planning, and environmental studies to quantify land and area sizes, especially in contexts requiring large-scale measurements.