Meter square
1 square
foot = 144 square inches
square metres (m2)
square centimetres (cm2)
square millimetres (mm2)
square kilometres (km2)
square feet (ft2)
square yards (yd2)
square miles (mi2)
1 square yard = 9 square feet
1 are = 100 square metres
1 hectare = 100 ares = 10,000 square metres = 0.01 square kilometres
1 acre = 4,840 square yards = 43,560 square feet.
1 barn = 10−28 square meters.
Some traditional South Asian units that have fixed value:
1 Killa = 1 acre
1 Ghumaon = 1 acre
1 Kanal = 0.125 acre (1 acre = 8 kanal)
1 Decimal = 48.4 square yards
1 Chatak = 180 square feet