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

A 'hectare' (symbol 'ha', pronounced ) is a unit of area equal to 10,000 square metres, or one square hectometre, and commonly used for measuring land area. A 100 m square is one ha. Its base unit, the are, was defined by older forms of the metric system, but neither it nor the hectare is part of the modern metric system. The Comité International des Poids et Mesures classifies the hectare as a unit that, although it is not part of the International System of Units, is expected to continue in use indefinitely, having an exact definition in terms of SI base units.

Contents

Explanation

Conversions

Metric

Other

See also

External links

Explanation

The hectare is commonly used in many countries, especially in domains concerned with land planning and management such as agriculture, forestry, and town planning where the use of square metres would be cumbersome and unnecessarily precise. In the United States, the acre is used to describe area measurements in comparable situations.

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)

★ 100 decares

★ 10,0000 centiares
===English units===

★ 2.4710538 international acres

★ 2.4710439 U.S. survey acres

★ 107,639 square feet

★ 0.00386 102 square miles (statute)

Other

★ 15 mū (Chinese)

★ 0.15 qǐng

★ 10 dunam or dönüm (Middle East)

★ 10 stremmata (Greece)

★ 6.25 rai (Thai)

★ ~1.008 chō (Japanese)

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