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    Area Units Conversion

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    US customary units
    		 US units equivalent
    		 SI units equivalent
    one square inch  (sq in)
    		 = 1/144 sq ft
    		  = 645.16 mm2
    one square foot  (sq ft) = 144 sq in =  1/9  sq yd
    		  = 0.092903 m2
    one square yard  (sq yd)
    		 = 1296 sq in = 9 sq ft
    		  = 0.83613 m2
    one acre  (ac)
    		 = 160 sq rd =  43560 sq ft
    =  1/640  sq mi
    		 = 4046.85642  m2
     = 0.40469 ha
    one square rod (sq rd)
    		 = 2721/4 sq ft
    		 = 25.2929 m2
    one rood
    		 = 40 sq rd = 10890 sq ft
    		  = 1011.7141 m2
    one square mile
    		 = 640 acres
    		 = 2.58999 km2

    Metric units
    		 US units equivalent
    		 SI units equivalent
    one are (a)
    		 = ~10763/8 sq ft
    		  = 100 m2 = 0.01 ha
    one hectare (ha)
    		 = ~21/2 acres
    		  = 10000 m2
     = 0.01 km2
    one km2
    		= ~3/8 sq mi
    		  = 1000000 m2
     = 100 ha2


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