Convert katha to square feet with regional standards for Bangladesh, Bihar, West Bengal, Assam, and Jharkhand. Shows m², acres, bigha, hectares, and area size references.
The katha (also spelled kattha or cottah) is a traditional unit of land measurement widely used in Bangladesh, India (particularly in Bihar, West Bengal, Assam, and Jharkhand), and Nepal. Its exact size varies significantly by region — from 720 square feet in Bangladesh and West Bengal to 2,880 square feet in Assam — making accurate conversion essential for real estate transactions and land records.
This calculator supports five regional standards, ensuring your conversion matches the local definition. Enter a value in katha and see it in square feet, square meters, square yards, acres, hectares, bigha, and cents. Alternatively, convert from square feet back to katha using your chosen standard.
Whether you are buying land in Dhaka, reviewing a Bihar land registry document, or comparing property sizes across states, this tool accounts for regional variations that generic converters miss. A reference table showing all five standards side by side helps you verify which definition applies to your situation.
The katha has no single universal definition — it varies by state and even by district. Using the wrong standard can mean a 4× error in land area. This calculator lets you select the exact regional standard, preventing costly mistakes in real estate. It also converts to international units (m², acres, hectares) for cross-border comparisons.
Square Feet = Katha × Regional_Factor Bangladesh/West Bengal: 1 katha = 720 sq ft Bihar/Jharkhand: 1 katha = 1,361.25 sq ft Assam: 1 katha = 2,880 sq ft Bigha: 1 bigha = 20 katha (BD/WB standard) Square Meters = sq ft × 0.092903
Result: 3,600 sq ft
5 katha × 720 sq ft/katha (Bangladesh standard) = 3,600 sq ft. This equals 334.5 m², 400 sq yd, or about 0.0826 acres. In Bigha, 5 katha = 0.25 bigha.
The katha (কাঠা in Bengali, कट्ठा in Hindi) is part of the traditional South Asian land measurement hierarchy: bigha → katha → chatak → square feet. It originated centuries ago as a practical way to measure agricultural land before standardized metric systems arrived. Today, despite official metrication, the katha remains deeply embedded in property markets across Bangladesh, eastern India, and Nepal.
The Bangladesh/West Bengal katha (720 sq ft) is the smallest common standard. Bihar and Jharkhand use a katha of 1,361.25 sq ft — nearly double. Assam uses an even larger katha of 2,880 sq ft. These differences mean that "5 katha" in Bangladesh is about 3,600 sq ft, while in Assam it would be 14,400 sq ft — a fourfold difference.
Always verify the katha standard in your specific district before making a purchase. Request the land area in both katha and square feet (or square meters) in the sale deed. Use this converter to cross-check the numbers. When comparing property prices in advertisements from different regions, convert all listings to price per square foot or square meter for a fair comparison.
In Bangladesh and West Bengal, 1 katha equals 720 square feet. This is also 66.89 square meters or 80 square yards.
The katha is a pre-colonial measurement that evolved independently across South Asian regions. Different local traditions and British-era survey standardizations led to different values being codified in each state's land revenue system.
In Bangladesh and West Bengal, 20 katha = 1 bigha. In Bihar and Jharkhand, the same 20:1 ratio applies, but since the katha itself is larger, the bigha is also larger.
First convert katha to square feet using the appropriate regional standard, then divide by 43,560. For Bangladesh: katha × 720 / 43,560 = acres.
Yes, Nepal uses the katha (and bigha/dhur) system in the Terai region with its own local standards. The calculator covers the most common South Asian definitions.
A decimel (or shotangsho) is 1/100 of an acre = 435.6 sq ft. In Bangladesh, 1 katha = 720 sq ft ≈ 1.653 decimel.