One hectare is defined as 10,000 square meters, whereas 1 acre is 4,840 square yards. There are approximately 2.47 acres in 1 hectare. Hectare is a unit of measurement in the International System of Units, while acre is a unit used in the English language.
In the Middle Ages, the acre was defined as the area of land a person could plow in one day of work with one yoke of oxen. Since then, the acre has been standardized to refer to 4,840 square yards or a 1/640 of a square mile. The U.S. acre and the international acre vary slightly, but the difference is considered negligible.