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"
3 katha in . . . Assam . . . . . 8,640 square feet Bengal . . . . . 2,160 square feet Bihar . . . . . . 4,083.75 square feet Madhya Pradesh . . . 18,000 square feet
18 katha is equivalent to 1 acre.
1 bigha=20 KATHA
1 katha = approx 267.6 sq metres.
10,800 square feet = 1,003.35 square meters.
1 Katha = 720 square feet 10 Katha = 720*10=7200 square feet. baja247.com
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In Bangladesh, one katha is 720 square feet.
1 Katha in to square feet
1620 SQFT for Siwan ,Gopalganj
1 katha = 1760 sq. Feet.
1 katha=66.9 sq. metres 1 katha=720 sft
In Bihar, one Katha varies from seven hundred and fifty square feet to about 2000 square feet. These units are usually used at Chapra.
250 (square meters) = 2,690.98 square feet.
150 square meters = 1,614.59 square feet.
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"