Bigha Katha Chatak Calculator
Enter Bigha, Katha and Chatak together to calculate the total land area.
How this calculator works
Total square feet = Bigha × 14,400 + Katha × 720 + Chatak × 45.
Example
1 Bigha + 2 Katha + 8 Chatak = 14,400 + 1,440 + 360 = 16,200 square feet.
Source and unit note
West Bengal Registration Directorate lists the commonly used relationships as 1 Bigha = 20 Katha = 14,400 sq ft, 1 Katha = 16 Chatak = 720 sq ft and 1 Chatak = 45 sq ft.
For Decimal, CalcSetu uses the exact acre-based definition: 1 Decimal = 1/100 Acre = 435.6 sq ft. Some official and local references show rounded approximations, so deed or survey records should be used for legal purposes.
West Bengal Registration Directorate
Last reviewed: 27 August 2026.
Frequently asked questions
How many Katha are in 1 Bigha?
1 Bigha = 20 Katha in the West Bengal standard used here.
How many Chatak are in 1 Katha?
1 Katha = 16 Chatak.
Can I enter values larger than 20 Katha or 16 Chatak?
Yes. The calculator simply converts the full area mathematically.