Productive ToolboxKatha Land Calculator
Calculate and convert land area in Katha units. Supports Bangladesh, West Bengal, Bihar, and Nepal regional standards with instant multi-unit conversion.
Katha Land Calculator
Convert land area between Katha, Decimal, Bigha, Acre, and more using Bangladesh, West Bengal, Bihar, or Nepal standards.
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What Is a Katha Land Calculator?
A katha land calculator is a free online tool that converts land area between Katha (also spelled Kata) and every major unit used in South Asian property records — Decimal, Bigha, Acre, Square Feet, Square Meter, and Hectare. It answers the core question in regional property transactions: how many decimal is this plot, and what is it in square feet?
The challenge is that 1 Katha does not mean the same thing in every location. In Bangladesh and West Bengal, 1 Katha equals 720 sq ft. In Bihar, it equals 1,361.25 sq ft. In Nepal, 1 Katha equals 3,645 sq ft — five times the Bangladesh value. Using the wrong regional standard produces errors of hundreds of square feet that invalidate land deeds, dispute boundary surveys, and create legal liability in sale agreements.
This kata land calculator is built for property buyers and sellers, real estate agents, land surveyors, lawyers preparing deed documents, and farmers managing agricultural plots across Bangladesh, West Bengal, Bihar, and Nepal. Supports Katha, Decimal, Bigha, Acre, Square Feet, Square Meter, and Hectare. Free, no signup required.
How Katha Conversion Works
All conversions go through a common base unit — Square Feet — using a two-step process. First, the input value is multiplied by the regional square-feet equivalent of that unit. Then the total square feet is divided by the target unit's square-feet value.
Core Conversion Formula
Step 1: Input × Unit_sqft = Total Square Feet
Step 2: Total Sq Ft ÷ Target_sqft = Output Value
Example (Bangladesh): 5 Katha → 5 × 720 = 3,600 sq ft → 3,600 ÷ 435.6 = 8.264 Decimal
- • Katha — 720 sq ft (BD/WB), 1,361.25 sq ft (Bihar), 3,645 sq ft (Nepal)
- • Decimal / Shotok — 435.6 sq ft (consistent across all regions)
- • Bigha — 20 Katha in all regions (size varies because Katha size varies)
- • Acre — 43,560 sq ft (universal)
- • Square Meter — 10.764 sq ft (universal SI conversion)
How to Use the Katha Land Calculator
- 1Enter Your Land Area Value: Type the numeric land area into the input field. Whole numbers and decimals are both accepted — for example, 5, 8.5, or 2.75. The calculator begins converting immediately as you type.
- 2Select Your Input Unit: Choose the unit your measurement is already in — Katha, Decimal, Bigha, Acre, Square Feet, Square Meter, or Hectare. This is the base unit that all output conversions are calculated from.
- 3Choose Your Regional Standard: Select Bangladesh, West Bengal, Bihar, or Nepal from the region dropdown. This setting controls the Katha and Bigha sizes used in every conversion. Decimal and Acre are constant across all regions.
- 4Read All Conversions at Once: The results panel displays your value converted into every supported unit simultaneously — Katha, Decimal, Bigha, Acre, Square Feet, Square Meter, and Hectare. All outputs update in real time with no extra steps.
- 5Copy or Export Results: Click any individual result to copy it to your clipboard. Use the export button to download the full conversion as a text file for use in property documents, legal deeds, or client reports.
Tool Features
- ✓Real-time conversion as you type
- ✓4 regional standards: Bangladesh, West Bengal, Bihar, Nepal
- ✓7 output units in one panel
- ✓Click-to-copy any result
- ✓Export full conversion as TXT
- ✓Shareable URL with your inputs
- ✓No signup required
- ✓Works on mobile and tablet
Real-World Use Cases
Residential Land Purchase (Bangladesh)
A buyer in Dhaka is quoted a 5 Katha plot for ৳85 lakh. They need to verify the plot size in Decimal for comparison with other listings quoted in Decimal. Entering 5 Katha (Bangladesh standard) returns 8.264 Decimal, 3,600 sq ft, and 0.0826 Acre — confirming the plot is roughly the same size as a nearby 8.5 Decimal listing they had inspected.
Agricultural Land Record (Bihar)
A farmer in Patna inherits a 12 Katha plot but needs the area in Acres for a government crop insurance form that only accepts Acre values. Using Bihar standard (1 Katha = 1,361.25 sq ft), 12 Katha = 16,335 sq ft = 0.375 Acre. The farmer enters 0.375 on the form and attaches the exported text file as documentation.
Property Listing Conversion (West Bengal)
A real estate agent in Kolkata has a 3 Bigha agricultural plot to list on a national property portal that requires Square Meter values. Using West Bengal standard, 3 Bigha = 60 Katha = 43,200 sq ft = 4,013.8 sq m. The agent lists the property at 4,013.8 m² and includes the Katha value in the description for local buyers.
Legal Deed Preparation (Nepal)
A lawyer in Kathmandu is drafting a sale deed for a 2.5 Katha urban plot. The Nepalese land registration office requires the area in both Katha and Square Meter. At Nepal standard (3,645 sq ft per Katha), 2.5 Katha = 9,112.5 sq ft = 846.6 sq m. The lawyer uses the exported result to populate both fields in the notarized deed.
Cross-Region Comparison
An NRI investor is comparing plots in Bangladesh and Bihar simultaneously. A 10 Katha plot in Dhaka (7,200 sq ft) looks identical in Katha count to a 10 Katha Bihar plot (13,612.5 sq ft), but the Bihar plot is 89% larger. Switching the regional dropdown instantly shows the difference and prevents a costly misunderstanding.
Boundary Survey Verification
A land surveyor in Rajshahi measures a plot as 1,440 sq ft. The deed says 2 Katha. Entering 1,440 sq ft with Bangladesh standard confirms it equals exactly 2 Katha — the deed is correct. If it had returned 2.05 or 1.95 Katha, there would be a boundary discrepancy to investigate.
Tips & Common Mistakes
💡 Pro Tips
- 💡Always confirm the regional standard first: Before entering any value, check which region applies. A land deed from Bihar and one from Bangladesh may both say '10 Katha' but differ by 6,412.5 sq ft. When in doubt, ask for the deed's district of issuance.
- 💡Use Decimal as a sanity check: Decimal (Shotok) is constant at 435.6 sq ft across all regions. If a conversion looks wrong, convert to Decimal first — it's the easiest unit to verify manually since 100 Decimal = 1 Acre exactly.
- 💡Katha and Kata are the same unit: Queries for 'kata land' and 'katha land' refer to the same unit. The spelling varies by language and romanization preference but the measurement is identical.
- 💡Export before closing the browser: The calculator doesn't save sessions. If you're doing due diligence on a property purchase, use the export button to download a timestamped text record of your conversion before closing the tab.
- 💡Double-check the Bigha direction: Bigha is always 20 Katha, but since Katha varies, 1 Bigha in Nepal (72,900 sq ft) is more than 5× a Bangladesh Bigha (14,400 sq ft). Never assume Bigha values are comparable across regions.
Common Mistakes
- ✕Using the wrong region: The most expensive mistake in katha conversions. Defaulting to Bangladesh standard when the land is in Bihar overstates the area by 89%. Always set the region before reading any output.
- ✕Confusing Bigha and Katha: Some users enter a Bigha value in the Katha field. 1 Bigha ≠ 1 Katha. In Bangladesh, 1 Bigha = 20 Katha = 14,400 sq ft. Select the correct input unit — the tool covers both.
- ✕Rounding conversion outputs: Land records require precision. Rounding 8.264 Decimal to 8 Decimal on a legal document introduces a 0.264 Decimal (~115 sq ft) gap that can void a transfer deed or cause boundary disputes.
- ✕Assuming Decimal and Katha are interchangeable: They are not. 1 Katha (Bangladesh) = 1.653 Decimal. A 10 Decimal plot is not the same as a 10 Katha plot — the Katha plot is 65% larger.
Katha Conversion Reference Tables
Regional Standards
| Region | 1 Katha (sq ft) | 1 Katha (sq m) | 1 Bigha (sq ft) | Katha per Bigha |
|---|---|---|---|---|
| Bangladesh | 720 | 66.89 | 14,400 | 20 |
| West Bengal | 720 | 66.89 | 14,400 | 20 |
| Bihar | 1,361.25 | 126.47 | 27,225 | 20 |
| Nepal | 3,645 | 338.63 | 72,900 | 20 |
Common Katha Conversions — Bangladesh / West Bengal (720 sq ft)
| Katha | Decimal | Sq Feet | Sq Meter | Acre |
|---|---|---|---|---|
| 1 | 1.653 | 720 | 66.89 | 0.01653 |
| 2 | 3.306 | 1,440 | 133.78 | 0.03306 |
| 3 | 4.959 | 2,160 | 200.67 | 0.04959 |
| 5 | 8.264 | 3,600 | 334.45 | 0.08264 |
| 10 | 16.529 | 7,200 | 668.90 | 0.16529 |
| 20 | 33.058 | 14,400 | 1,337.8 | 0.33058 |
| 40 | 66.116 | 28,800 | 2,675.6 | 0.66116 |
| 60 | 99.174 | 43,200 | 4,013.4 | 0.99174 |
* Decimal = 435.6 sq ft and Acre = 43,560 sq ft are consistent across all regions.
Frequently Asked Questions
What is Katha in land measurement?
Katha (also spelled Kata) is a traditional land measurement unit used across South Asia, particularly in Bangladesh, West Bengal, Bihar, and Nepal. It is subdivided from Bigha — there are always 20 Katha in 1 Bigha — but the absolute size of 1 Katha in square feet varies significantly by region. It is used in property deeds, residential plot sales, and agricultural land records.
How many square feet is 1 Katha?
It depends on the region. In Bangladesh and West Bengal, 1 Katha equals 720 square feet. In Bihar, 1 Katha equals 1,361.25 square feet. In Nepal, 1 Katha equals 3,645 square feet. Always confirm which regional standard applies before performing any conversion — the wrong standard can introduce errors of hundreds of square feet.
How many Decimal is 1 Katha in Bangladesh?
In Bangladesh, 1 Katha equals 720 sq ft and 1 Decimal equals 435.6 sq ft, giving 1 Katha approximately 1.653 Decimal. A 5 Katha plot is approximately 8.264 Decimal, and a 10 Katha plot is approximately 16.529 Decimal. Decimal is fixed at 435.6 sq ft in all regions.
How many Katha in 1 Bigha?
1 Bigha equals 20 Katha in all regions — Bangladesh, West Bengal, Bihar, and Nepal. The ratio is constant, but the total square footage of 1 Bigha differs because the Katha size itself varies. A Bangladesh Bigha is 14,400 sq ft while a Nepal Bigha is 72,900 sq ft.
How many Katha in 1 Acre (Bangladesh)?
1 Acre equals 43,560 sq ft. In Bangladesh where 1 Katha equals 720 sq ft, there are 60.5 Katha per Acre. In Bihar at 1,361.25 sq ft per Katha, there are approximately 32 Katha per Acre. In Nepal at 3,645 sq ft per Katha, there are approximately 11.95 Katha per Acre.
What is the difference between Katha and Decimal?
Katha and Decimal are both South Asian land area units, but Decimal is fixed at 435.6 sq ft everywhere while Katha varies by region. In Bangladesh, 1 Katha equals 1.653 Decimal, making Katha the larger unit. Decimal is commonly used for smaller residential plots; Katha is used for medium to large plots.
Is kata land the same as katha land?
Yes. Kata and Katha refer to the same unit of land measurement. The spelling varies by language and romanization preference — Bengali, Hindi, and Nepali scripts each have their own transliteration — but the measurement is identical. This calculator handles both spellings and all regional standards.
Can I convert from Decimal to Katha using this tool?
Yes. Select Decimal as your input unit and the calculator outputs the equivalent Katha value alongside every other supported unit simultaneously. Set your regional standard first — the Katha output for the same Decimal input differs between Bangladesh and Bihar.
How do I find out which Katha standard my land deed uses?
Check the district or upazila listed in your deed. Bangladesh and West Bengal deeds use 720 sq ft per Katha. Bihar deeds use 1,361.25 sq ft. Nepal deeds use 3,645 sq ft. If the region is unclear in an older deed, cross-reference the listed square footage with the Katha count — the ratio will identify the standard.
Is my data private when using this calculator?
Yes. We do not collect or store what you enter.
Who Uses This Calculator?
Property Buyers & Sellers
Verify plot sizes during negotiations and confirm deed measurements before signing sale agreements. Catches regional standard mismatches before they become legal disputes.
Real Estate Agents
Convert between Katha, Decimal, and Square Feet when listing properties on national portals or preparing comparative market analyses for clients across South Asia.
Land Surveyors
Cross-check field measurements against deed records in multiple units. Export conversion summaries to attach to official survey reports submitted to land registration offices.
Lawyers & Notaries
Populate sale deeds, gift deeds, and partition documents with accurate multi-unit measurements required by land registration authorities in Bangladesh, India, and Nepal.
Farmers & Agricultural Landowners
Calculate plot areas for crop insurance applications, government subsidy claims, and agricultural land records that require values in Acre or Square Meter alongside local Katha.
Students & Researchers
Study South Asian land measurement systems and practice unit conversion for geography, real estate, and urban planning coursework using real regional standards.
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