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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
0.00386102 sq mi 1 ha 104 m2
2.471 acre 1 ha 104 m2
107,639 sq ft 1 ha 104 m2

A hectare (symbol ha, ) is a unit of area equal to , or one square hectometre (100 metres, squared), and is 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 Statesmarker, Great Britainmarker, Irelandmarker , Myanmarmarker, and to some extent Canadamarker instead use the Imperial measurement acre, which equals 0.404686 ha. Some of the former Ottoman countries and Norwaymarker 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.

Even in countries that have undergone a general conversion from traditional English measurements to metric measurements (e.g. Canadamarker), legal descriptions relating to land, which frequently use the acre, have not been converted, as doing so would require a resurvey of the land, an activity which would destabilize the security of land titles.

International use

The hectare has been subsequently defined in a number of nations by a country-specific term. In each of the following, the national unit of area has been defined as one hectare:


One hectare is equivalent to:


Imperial units


See also


External links

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