Convert Bigha (Assam) to Katha (Bengal)
Convert bighas to kathas instantly. 1 bigha (assam) = 20 katha (bengal) — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Katha (Bengal) to Bigha (Assam) converter for the reverse conversion.
Units explained
Bigha (Assam)
An Assam bigha is a traditional unit of land area used in Assam and parts of Northeast India, equal to approximately 1337.8 m² (functionally identical to the Bengal bigha).
Derived from the same colonial Bengali standardization that produced the Bengal bigha. Assam land records share much of Bengal's traditional unit system.
Assam bighas are used in property transactions and agricultural records across Assam and several other Northeast states. The unit equals 14,400 sq ft.
Standardized in colonial Bengal/Northeast India administration.
Katha (Bengal)
A Bengal katha is a traditional unit of land area equal to approximately 66.89 m² (1/20 of a Bengal bigha or 720 square feet). Used in West Bengal and Bangladesh.
Defined as 1/20 of the Bengal bigha during colonial standardization.
Bengal kathas are widely used in residential property descriptions in Kolkata, Dhaka, and other Bengali-speaking regions. Property advertisements often list area in kathas with chatak (1/16 katha) subdivisions.
Standardized in colonial Bengal.
Bigha (Assam) to Katha (Bengal) conversion formula
The relationship between bighas and kathas:
To convert bighas to kathas, multiply the value in bighas by 20. To reverse, multiply kathas by 0.05.
How to use this converter
Type a value into the calculator. The result in kathas updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Katha (Bengal) to Bigha (Assam) converter for the reverse direction.
Step-by-step: convert bighas to kathas
- Write down the value in bighas (bigha).
- Multiply that value by the factor 20.
- The product is the equivalent value in kathas (katha).
- To reverse, multiply the katha (bengal) value by 0.05.
Worked examples
Example 1 — Convert 1 bigha to katha:
1 × 20 = 20 katha
Example 2 — Convert 100 bigha to katha:
100 × 20 = 2000 katha
Real-world example — Coastal cruise distances
A 10-bigha (assam) coastal sailing route converts to a different value in kathas — useful for cruise operators who switch between maritime, aviation, and road-distance units depending on the leg of the trip.
10 bigha × 20 = 200 katha
Real-world example — Road-sign distances across systems
A 100-bigha (assam) road sign converts cleanly into kathas — exactly the conversion drivers planning trips abroad rely on when reading road signs in a different measurement system.
100 bigha × 20 = 2000 katha
Real-world example — Endurance race distances
A 50-bigha (assam) cycling or running race converts to a recognizable distance in kathas. Endurance athletes coming from a different measurement system use this conversion to compare training plans across regions.
50 bigha × 20 = 1000 katha
Bigha (Assam) to Katha (Bengal) conversion table
Standard reference values for converting bighas to kathas:
| Bigha (Assam) [bigha] | Katha (Bengal) [katha] |
|---|---|
| 0.01 | 0.2 |
| 0.1 | 2 |
| 1 | 20 |
| 2 | 40 |
| 3 | 60 |
| 4 | 80 |
| 5 | 100 |
| 10 | 200 |
| 20 | 400 |
| 30 | 600 |
| 40 | 800 |
| 50 | 1000 |
| 100 | 2000 |
| 500 | 10000 |
| 1000 | 20000 |
Frequently asked questions
How many kathas is 1 bigha (assam)?
How do I convert bighas to kathas?
How do I convert kathas back to bighas?
How many kathas is 100 bighas?
Popular area unit conversions
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Metric / SI (5 units)
Imperial / US Customary (3 units)
Indian Subcontinent (15 units)
Sources & references
Conversion factor (1 bigha = 20 katha) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Astronomical Union — System of Astronomical Constants
The IAU defines astronomical units including the AU (149597870700 m exactly) light-year and parsec used in astronomy and astrophysics.