1 acre = 43,560 square feet = 4,840 gaj (square yards) = 4,046.86 square metres. 1 hectare is about 2.471 acres.

There is no single answer. A bigha differs from state to state, and often between districts of the same state. Ask your patwari or tehsil, or check your land record, enter the value in "My area's unit", and the converter will use it.

As per Haryana-Punjab land records, 1 kanal = 20 marla = 5,445 square feet, and 1 marla = 272.25 square feet. 8 kanal make 1 acre.

The gaj used for plots is a square yard. 1 gaj = 9 square feet = 0.836 square metres.