Acres to hectares (ac to ha) area units conversion factor is 0.404685642. To find out how many hectares in an acre, multiply the acre value by the conversion factor or use the converter.
1 Acre = 0.404685642 Hectares
There are 0.404685642 hectares in an acre, because an acre is defined as the area of 1 chain (66 ft) by 1 furlong (660 ft), that makes 66 ft * 660 ft = 43 560 sq. feet (or 4046.8564 sq. meters). Hectare is defined as the area of 100 ares (1 are is 100 sq. meters), and equals to 100 * 100 = 10 000 sq. meters, that makes 4046.8564 / 10000 = 0.404685642 hectares in an acre.
For example, to find out how many hectares there are in an acre and a half, multiply the acre value by the conversion factor, that makes 1.5 acres * 0.404685642 = 0.6 hectares in an acre and a half.
Acre is an imperial and US customary area unit and defined as an area of 1 chain by 1 furlong (66 feet * 660 feet). 1 acre equals to 43560 square feet, 4840 sq. yards or 4046.85 sq. meters and about 40 percent of a hectare. The abbreviation is "ac".
Hectare is a metric system area unit and defined as 100 ares (hectare comes from "hecto" + "are", means 100 ares). 1 are is 100 square meters, that makes 1 hectare equals to 10 000 square meters. The abbreviation is "ha".