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
• 107,639 square feet

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 also

• Orders of magnitude
• conversion of units

• 1 E4 m² for further comparisons

External links

• Conversion Calculator for Units of AREA (http://www.ex.ac.uk/trol/scol/ccarea.htm)
• [1] (http://www.gm-unccd.org/FIELD/Countries/India/PROJECT_47_.pdf) (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.

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