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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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