Definitions

# hectare

[hek-tair]
hectare, abbr. ha, unit of area in the metric system, equal to 10,000 sq m, or about 2.47 acres.

Comparison of Area units
Unit SI SI base
1 ca 1 m² 1 m²
1 a 1 dam² 102
1 ha 1 hm² 104
100 ha 1 km² 106
non-SI comparisons
non-SI metric SI base
0.00386102 sq mi 1 ha 104
2.471 acre 1 ha 104
107,639 sq ft 1 ha 104
A hectare (symbol ha, ) is a unit of area equal to , or one square hectometre (0.01 kilometer, or 100 meters squared), and commonly used for measuring land area. A square 100 m on each side is one ha, the most common and convenient SI area multiple used in the surveying profession for day to day legal documents such as land deeds, mortgage surveys, town planning, environmental protection, and other necessary property considerations under the law. Square kilometers are often too large to work with conveniently, and square meters are similarly too small.

Its base unit, the are, was defined by older forms of the metric system, but is no longer part of the modern metric system. The Comité International des Poids et Mesures classifies the hectare as a unit that is accepted for use with SI.

## Explanation

The hectare is commonly used in most countries around the world, especially in domains concerned with land planning and management such as agriculture, forestry, and town planning. The few countries that still use the imperial system (i.e. United States, Myanmar, and to some extent in Canada) have a different unit of area, which is called acre, equal to 43,560 square feet or 33 feet x 1/4 mile, equivalent to .404695 ha.

## Conversions

One hectare is equivalent to: