Hectare

A hectare (symbol ha) is a unit of area, equal to 10,000 square meters, commonly used for measuring land area. It is a "non-SI unit currently accepted for use with the International System", according to BIPM.

Definition

1 hectare = 100 ares = 10,000 square metres = (100 metres)² = 100 metres x 100 metres.

Thus a hectare is the area of a square plot of land where each side of the square is 100 metres, that is, a square hectometer.

The name is a contraction of the SI prefix hecto + are; a hectare is 100 ares.

Explanation

The hectare is common in domains such as agriculture, forestry, and town planning in many countries. It is rarely used in the United States.

Conversions

One hectare is equivalent to:

Metric

• 100 ares
• 10 000 square metres = 100 metres × 100 metres
• 1 square hectometre (a square with sides 100 metres long)
• 0.01 square kilometres
• 10 decares

English units

• 2.471 053 8 international acres
• 2.471 043 9 U.S. survey acres
• 107,639 square feet
• 0.00386 102 square miles (statute)

Other

• 15 mus (Chinese)
• 10 dunams (Middle East)
• 6.25 rai (Thai)

See also

• Orders of magnitude
• conversion of units

• 1 E4 m² for further comparisons

External links

• Official SI website: Table 8. Other non-SI units currently accepted for use with the International System Their use is not encouraged.