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Convert acres to hectare

Please provide values below to convert acre [ac] to hectare [ha], or vice versa.



Definition: An acre (symbol: ac) is a unit of land area used in the imperial and US customary systems. 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.

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. Before the metric system was adopted, many countries used their own versions of the acre. The most commonly used acre today, the international acre, is based on the international yard, which was defined in 1959.

Current use: Acres are used in countries including the United States, the UK, Ghana, India, Canada, and others. The United States (US) uses both international as well as US survey acres (~4047 square meters), which vary based on which type of yard is used in the measurement. However, area measurements are typically not accurate enough for the difference between the two acre measurements to be detectable.


Definition: A hectare (symbol: ha) is a unit of area that is accepted in the International System of Units (SI). It is primarily used to measure land area. One hectare is equal to 10,000 square meters and is equivalent to approximately 2.471 acres.

History/Origin: The hectare was first introduced in 1795 as part of the metric system. 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. The "are" is still used in certain areas when referencing real estate, particularly in India, Indonesia, and a number of European countries.

Current use: Hectares are primarily used to measure land area around the world. 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."

Acre to Hectare Conversion Table

Acre [ac]Hectare [ha]
0.01 ac0.0040468564 ha
0.1 ac0.0404685642 ha
1 ac0.4046856422 ha
2 ac0.8093712845 ha
3 ac1.2140569267 ha
5 ac2.0234282112 ha
10 ac4.0468564224 ha
20 ac8.0937128448 ha
50 ac20.234282112 ha
100 ac40.468564224 ha
1000 ac404.68564224 ha

How to Convert Acre to Hectare

1 ac = 0.4046856422 ha
1 ha = 2.4710538147 ac

Example: convert 15 ac to ha:
15 ac = 15 × 0.4046856422 ha = 6.0702846336 ha

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