Imperial and metric area units
Square inches, square feet, square yards, acres, and square miles belong to the imperial/US system, while square centimeters, square meters, hectares, and square kilometers are metric. A square foot is defined as exactly 0.09290304 square meters, and an acre as exactly 4,046.8564224 square meters.
Area conversions are exact and rest on fixed factors — for more unit pairs, use our area conversion hub.