Science Fair Project Encyclopedia
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. Its use is widespread in agriculture where it is more practical than either square metres or square kilometres, typical fields being a few hectares in size.
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
- 0.00386 102 square miles (statute)
- 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
- 1 E4 mē for further comparisons
- Conversion Calculator for Units of AREA
-  (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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