How many acres does someone need for a cow?

The minimum space required by a cow in a closed area like a shed is 40 sq ft whereas in an open area, the space required by a single cow is 80 sq.ft. Overall, in a small cattle farm of 20 animals, the minimum land area required is around 100 then the farm area should be increased to 15000 sq.ft. Dairy buffaloes need a little more space when compared to the cows i.e., a single buffalo may need 40 – 45 sq. ft of area.