Metric Units
1 Square Kilometer (km²) = 100 Hectares (ha) = 247.1 Acres = 0.386 Square Miles (mi²)
1 Square Meter (m²) = 10.764 Square Feet (ft²), 1 Are (a) = 100 Square Meters (m²)
1 Hectare (ha) = 15 Mu (Chinese acres) = 1 ha = 10,000 Square Meters (m²) = 2.471 Acres = 0.01 Square Kilometers (where h stands for hectometer, and ha² means the square of a hectometer)
1 Square Mile (mi²) = 2.590 Square Kilometers (km²)
1 Acre = 0.4047 Hectares (ha) = 4.047×10 Square Kilometers (km²) = 4047 Square Meters (m²)
1 Square Foot (ft²) = 0.093 Square Meters (m²), 1 Square Inch (in²) = 6.452 Square Centimeters (cm²)
1 Square Yard (yd²) = 0.8361 Square Meters (m²)
1 Mu = 2000/3 Square Meters ≈ 666.666 Square Meters
Chinese Traditional Units
1 Square Li = 22,500 Square Zhang
1 Square Zhang = 100 Square Chi
1 Square Chi = 100 Square Cun
1 Square Cun = 100 Square Fen
1 Square Fen = 100 Square Li
1 Square Li = 100 Square Hao
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