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A hectare (symbol ha) is a metric unit of surface area, equal to 100 ares (the name is a contraction of the SI prefix hecto + are). It is a non-SI unit currently accepted (although discouraged) for use with the SI.

In India, also the abbreviation hac is used.

One hectare is equivalent to:

100 ares
10 000 square metres
1 square hectometre (a square with sides 100 metres long)
0.01 square kilometres
2.471 053 8 international acres
2.471 043 9 U.S. survey acres

Conversely:

100 hectares is equal to one square kilometre.
0.404 685 64 hectares is equal to one international acre
0.404 687 26 hectares is equal to one U.S. survey acre

See 1 E4 m² for further comparisons.

External link

Conversion Calculator for Units of AREA
[1] (pdf, 1.3 MB); from the budget on p.79 it can be derived that in India hac means hectare; it also shows that within the same text also ha is used.

SI derived units of area Units of area

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