Unit I I base 1 ca 1 m² 1 m² 1 a 1 dam² 102 m² 1 ha 1 hm² 104 m² 100 ha 1 km² 106 m² non-SI comparisons non-SI etric I base 0.00386102 sq mi 1 ha 104 m² 2.471 acre 1 ha 104 m² 107,639 sq ft 1 ha 104 m² A hectare (symbol ha, )'s a unit of area equal to, or one square hectometre (100 metres, squared), and commonly used for measuring land area. The hectare's used in most countries around the world, especially in domains con… (More on Hectare)