Legal Metrological Units
1 square kilometer (km) = 100 hectares (hm) = 247.1 acres (acre) = 0.386 square miles (mile)
1 square meter (m²) = 10.764 square feet (ft²) 1 acre (are) = 100 square meters (m²)
1 hectare (hm²) = 15 mu = 1 hm² = 10,000 square meters (m²) = 2.471 acres (acre) = 0.01 square kilometers (where 'h' represents hectometer, and hm² denotes the square of a hectometer)
1 square mile (mile²) = 2.590 square kilometers (km²)
1 acre (acre) = 0.4047 hectares (ha) = 4.047×10⁻⁴ 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
Municipal Metrological 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 miu