Convert Square Foot to Katha (Bengal)
Convert square feet to kathas instantly. 1 square foot = 0.0013888928 katha (bengal) — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Katha (Bengal) to Square Foot converter for the reverse conversion.
Units explained
Square Foot
A square foot is an imperial unit of area equal to exactly 0.09290304 m². It is the dominant unit for real estate area measurement in the United States and is widely used in India for residential property listings.
Derived by squaring the foot. The foot was standardized to exactly 0.3048 m via the 1959 International Yard and Pound Agreement.
Square feet are the standard unit for US real estate floor area, HVAC capacity ratings (BTU per ft²), commercial leasing, and construction. In India, square feet is the dominant unit for residential property advertisements alongside traditional regional units.
Foot dates to ancient civilizations; modern exact value standardized in 1959.
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.
Square Foot to Katha (Bengal) conversion formula
The relationship between square feet and kathas:
To convert square feet to kathas, multiply the value in square feet by 0.0013888928. To reverse, multiply kathas by 719.9979677737.
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 Square Foot converter for the reverse direction.
Step-by-step: convert square feet to kathas
- Write down the value in square feet (ft²).
- Multiply that value by the factor 0.0013888928.
- The product is the equivalent value in kathas (katha).
- To reverse, multiply the katha (bengal) value by 719.9979677737.
Worked examples
Example 1 — Convert 1 ft² to katha:
1 × 0.0013888928 = 0.0013888928 katha
Example 2 — Convert 100 ft² to katha:
100 × 0.0013888928 = 0.1388892809 katha
Real-world example — Postcard and small-object dimensions
A postcard is about 5 square feet wide. Converting to kathas is essential for international postal addressing forms that ask for dimensions in different units across countries.
5 ft² × 0.0013888928 = 0.006944464 katha
Real-world example — Ruler-scale measurements
A 30-square foot school ruler converts cleanly to kathas — useful when buying a desk accessory from a retailer whose product specs use a different unit.
30 ft² × 0.0013888928 = 0.0416667843 katha
Real-world example — Hardware-scale dimensions
A 10-square foot fastener or component is about as long as a thumbnail. Mechanics and DIY enthusiasts convert between square feet and kathas daily when mixing metric and imperial tools.
10 ft² × 0.0013888928 = 0.0138889281 katha
Square Foot to Katha (Bengal) conversion table
Standard reference values for converting square feet to kathas:
| Square Foot [ft²] | Katha (Bengal) [katha] |
|---|---|
| 0.01 | 1.388893e-5 |
| 0.1 | 0.0001388893 |
| 1 | 0.0013888928 |
| 2 | 0.0027777856 |
| 3 | 0.0041666784 |
| 4 | 0.0055555712 |
| 5 | 0.006944464 |
| 10 | 0.0138889281 |
| 20 | 0.0277778562 |
| 30 | 0.0416667843 |
| 40 | 0.0555557124 |
| 50 | 0.0694446405 |
| 100 | 0.1388892809 |
| 500 | 0.6944464045 |
| 1000 | 1.3888928091 |
Frequently asked questions
How many kathas is 1 square foot?
How do I convert square feet to kathas?
How do I convert kathas back to square feet?
How many kathas is 100 square feet?
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Imperial / US Customary (14 units)
US Survey (5 units)
Indian Subcontinent (16 units)
Other Regional (10 units)
Scientific / Physics (5 units)
Historical / Pre-metric European (6 units)
Sources & references
Conversion factor (1 ft² = 0.0013888928 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.