When the metric system was further rationalised in 1960, resulting in the International System of Units (SI), the are was not included as a recognised unit. In 1795, when the metric system was introduced, the "are" was defined as 100 square metres and the hectare ("hecto-" + "are") was thus 100 "ares" or 1⁄100 km2. An acre is about 0.405 hectare and one hectare contains about 2.47 acres. The hectare (symbol: ha) is an SI accepted metric system unit of area equal to 100 ares (10,000 m2) and primarily used in the measurement of land as a metric replacement for the imperial acre. One international acre is defined as exactly 4,046.8564224 square metres. The most common use of the acre is to measure tracts of land. Convert acre (ac) versus hectare (ha) in swapped opposite direction. In the United States both the international acre and the US survey acre are in use, but differ by only two parts per million, see below. 1 acre (ac) 0.40 hectare (ha) Filed under: Main menu surface area menu Acres conversion. The most commonly used acre today is the international acre.
It is defined as the area of 1 chain by 1 furlong (66 by 660 feet), which is exactly equal to 1⁄640 of a square mile, 43,560 square feet, approximately 4,047 m2, or about 40% of a hectare. The acre (symbol: ac) is a unit of land area used in the imperial and US customary systems. Let's see how both units in this conversion are defined, in this case Acres and Hectares: Acre (ac)
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