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
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, Template:PronEng) is a unit of area equal to 10,000 square metres (107,639 sq ft), 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. The United States, Myanmar, and to some extent Canada use the Imperial measurement acre, equal to 43,560 square feet (4,047 m²), or 33 feet (10 m) x 1/4 mile, which is 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 acres
• 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
• Acre
• 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
• Agricultural Measurements and Conversions