Katha or Biswa (also spelled kattha or cottah; Hindi: कट्ठा, Assamese: কঠা, Bengali: কাঠা) is a unit of area mostly used for land measurement in India, Nepal, and Bangladesh.
After metrication in the mid-20th century by these countries, the unit became officially obsolete.
In Bihar, one Katha may vary from 720 to 3,267 square feet (ft2).
The origin of the term and measurement unit was during the Pala Empire.
[2][3] In Jharkhand, 1 Katha ranges from 720 to 1,742 square feet.
1 Acre = 3.025 Bigha, 1 katha= 16 chatak, 1 chatak=45 sq.ft In Nepal, 1 Katha is equivalent to 338.55 m2 With Manoj Chhetri