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 (United Kingdom, United States, 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
Imperial units
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
External links
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