Before the metric system was adopted, many countries used their own versions of the acre. History/origin: In the Middle Ages, the acre was defined as the area that a yoke (pair) of oxen could typically plow within one day, using a wooden plow. It is defined as the area of 1 chain (66 feet) by 1 furlong (660 feet), which is exactly equal to 1/640 of a square mile, 43,560 square feet, or exactly 4046.8564224 square meters. Even though it is not an SI unit (just a unit accepted for use with SI) the SI brochure states that the use of the hectare is expected to "continue indefinitely." Acreĭefinition: An acre (symbol: ac) is a unit of land area used in the imperial and US customary systems. The "are" is still used in certain areas when referencing real estate, particularly in India, Indonesia, and a number of European countries.Ĭurrent use: Hectares are primarily used to measure land area around the world. The term hectare is derived from the metric prefix "hecto," denoting a factor of one hundred, and the metric area "are," a metric unit for measuring area that has fallen out of use in SI.
History/Origin: The hectare was first introduced in 1795 as part of the metric system. One hectare is equal to 10,000 square meters and is equivalent to approximately 2.471 acres. It is primarily used to measure land area. Definition: A hectare (symbol: ha) is a unit of area that is accepted in the International System of Units (SI).
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