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1 bigha=20 KATHA
From the Wikipedia article for "Katha (unit)" (it seems that Cottah is an alternate spelling for Katha): "A Katha is approximately 720-square-foot (67 m2) or 1/20 of a bigha. It is still in use in much of Bangladesh and India"
Bighas size varies based on the region. That is to say that multiple places use the word bigha for different units of area.
1 Bigha = 1,369 m2
3.Kolkata is in India, where 1 bigha = 0.33 acres, so 1 acre is almost exactly 3 bigha