Hectare

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For criticism see Criticism of Hectare

Comparison of Area units Unit SI SI base 1 ca 1 m² 1 m² 1 a 1 dam² 102 m² 1 ha 1 hm² 104 m² 100 ha 1 km² 106 m² non-SI comparisons non-SI metric SI base 2.471 acre 1 ha 104 m² 107,639 sq ft 1 ha 104 m²

A hectare (symbol ha, pronounced /ˈhɛktɛər/) is a unit of area equal to 10,000 square meters (107,639.1 sq ft), or one square hectometre (0.1 kilometer, or 100 meters, squared), and commonly used for measuring land area. A square 100 m on each side is one ha, the most common and convenient SI area multiple used in the surveying profession for day to day legal documents such as land deeds, mortgage surveys, town planning, environmental protection, and other necessary property considerations under the law. Square kilometers are often too large to work with conveniently, and square meters are similarly too small.

Its base unit, the are, was defined by older forms of the metric system, but is no longer part of the modern metric system. The Comité International des Poids et Mesures classifies the hectare as a unit that is accepted for use with SI.

Explanation

The hectare is commonly used in most countries around the world, especially in domains concerned with land planning and management such as agriculture, forestry, and town planning. The few countries that still use the imperial system (i.e. United States, Myanmar, and to some extent in Canada) have a different unit of area, which is called acre, equivalent to .404695 ha.

Conversions

One hectare is equivalent to:

Metric

• 10,000 square metres
• 0.01 square kilometre
• 1 square hectometre = 100 metres × 100 metres (a square with sides 100 metres long)
• 10 decares
• 100 ares
• 10,000 centiares

Imperial units

• 2.4710538 international acres
• 2.4710439 U.S. survey acres
• 107,639 square feet
• 0.00386102 square miles (statute)

Other

• 15 mǔ (Chinese)
• 0.15 qǐng
• 10 dunam or dönüm (Middle East)
• 10 stremmata (Greece)
• 6.25 rai (Thai)
• ≈ 1.008 chō (Japanese)
• 7.47 bigha (Bangladesh, India, Nepal)

See also

• 1 E+4 m² for further comparisons
• conversion of units
• hecto-
• Hectometre
• Orders of magnitude

External links

• Official SI website: Table 6. Non-SI units accepted for use with the International System of Units

Adapted from the Wikipedia article, "Hectare" http://en.wikipedia.org/wiki/Hectare, used under the GNU Free Documentation License.
Search for "Hectare" on Wikipedia, Wikimedia Commons, Wiktionary, Wikiquote, Wikibooks, Mediawiki Wikia, Wikitravel, Google (excludes Wikipedia), Yahoo (excludes Wikipedia), Creative Commons, WorldCat Amazon, Recent NY Times, Older NY Times.