Hectare

A hectare (symbol ha, ) is a unit of area equal to 10,000 m2, or one square hectometre (100 metres, squared), and commonly used for measuring land area.

The hectare is used in most countries around the world, especially in domains concerned with land ownership, land planning, and management, including law (land deeds), agriculture, forestry, and town planning. In similar applications, the United States, Myanmar, and to some extent Canada instead use the Imperial measurement acre, which equals 0.404686 ha. Some of the former Ottoman countries and Norway use the decare, one tenth of a hectare.

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.

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 qǝng
 * 10 dunam or dönüm (Middle East)
 * 10 stremmata (Greece)
 * 6.25 rai (Thai)
 * ≈ 1.008 chŝ (Japanese)
 * 7.47 bigha (Bangladesh, India,Nepal)