You can't, they measure different things.
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1 gaj = 1 sq. yard = 9 sq. feet hence, 300 gaj = 2700 sq. feet
1 kanal equals to 4500 sq feet because I have bought a plot too
1 Marla = 272.25 sq. feet 5 Marlas = 272.25 sq. feet X 5 = 1,362.5 sq ft
Divide length by 3 (convert feet into yards), divide width by 3 (convert feet into yards) and multiply the results. or Multiply length (in feet) by width (in feet) to the area (in sq feet) and divide by 9 (convert sq feet to sq yards).
1 sq ft 0.092903 sq metres so 20,000 sq ft = 1858.0608 sq metres.