Published Jun 10, 2026 4 Min Read

Square feet and Katha are two commonly used land measurement units in India, but they belong to very different systems. Square feet is a standardised international unit widely used in urban real estate, while Katha is a traditional, region-specific unit still prevalent in eastern Indian states. Understanding how to convert between these two units is essential for anyone dealing with property buying, selling, or documentation. The conversion is not fixed across the country, which often creates confusion among buyers and sellers. Different states like Bihar, West Bengal, and Assam use different Katha values, making it important to always check local standards before making calculations. This guide explains square feet, Katha, their differences, conversion methods, tables, and practical examples to help you make accurate land measurements confidently.

 

What is square feet and why is it used in real estate??

Square feet (sq ft) is a standard unit of area measurement used globally, especially in real estate. It represents the area of a square with sides of one foot each. In India, square feet is widely accepted in urban housing, commercial spaces, and official property documents. It provides a consistent and easy-to-understand measurement for comparing property sizes. Since it follows a fixed system, square feet eliminates confusion and is preferred in modern land transactions and planning.

 

Where square feet is commonly used?

Square feet is mainly used in urban real estate markets. It is the standard measurement for apartments, residential plots, and commercial buildings. Developers use it to describe carpet area, built-up area, and super built-up area. It is also commonly used in property advertisements, housing schemes, and government approvals. Because of its uniformity, square feet helps buyers easily compare properties across cities and regions.

 

What is katha?

Katha is a traditional land measurement unit widely used in eastern and northern parts of India, particularly for agricultural land, residential plots, and semi-urban property transactions. Unlike square feet, Katha does not have a standard national value, and its size varies across different states and regions. This variation makes it important to understand local measurement standards when performing a Square Feet to Katha conversion.

Katha originated from historical land revenue systems and continues to be used in land records, property registration documents, and agricultural transactions in several states, including:

-Bihar
-West Bengal
-Assam
-Jharkhand

The value of 1 Katha differs significantly from one state to another. For example, a Katha in Bihar is larger than a Katha in West Bengal. Because of these regional differences, buyers, sellers, and investors should always verify the local Katha measurement before calculating land area, property valuation, stamp duty, or registration charges. Understanding Katha and its regional variations is essential for accurate Square Feet to Katha conversion and informed real estate decisions.

 

Why katha varies across regions?

Katha varies because India did not standardize traditional land units. Different kingdoms and local administrations historically defined land measurements differently. Over time, these regional systems continued in land records. Even today, state governments follow local customs, which is why Katha size differs from one state to another.

 

Square feet to katha conversion formula

To convert square feet to Katha, you divide the total square feet by the local Katha value of that region.

Formula:

Katha = Square Feet ÷ Local Katha Value

Since each state has its own Katha size, the result will differ depending on location.

State1 Katha in Sq Ft
Bihar1361 sq ft
West Bengal720 sq ft
Assam2880 sq ft

 

How to convert 1000 square feet to katha?

The conversion of 1000 square feet in Katha depends on the state-specific Katha measurement. In Bihar, where 1 Katha equals 1,361 square feet, 1000 square feet is approximately 0.73 Katha. In West Bengal, where 1 Katha equals 720 square feet, 1000 square feet converts to approximately 1.39 Katha. In Assam, where 1 Katha equals 2,880 square feet, 1000 square feet equals about 0.35 Katha. Always verify local land measurement standards before calculating property value or completing registration.


Why accurate square feet to katha conversion matters?

Accurate conversion from Square Feet to Katha is essential for property valuation, stamp duty assessment, mutation processes, and legal documentation. Errors in conversion can result in disputes related to land measurements, ownership records, or property pricing. Financial institutions also verify land dimensions before approving home loans or loans against property. Knowing the correct conversion ratio enables buyers to compare plots accurately and helps avoid inconsistencies between sale deeds and official land records. For high-value property transactions, it is advisable to verify measurements through local revenue records, survey reports, or other official documents.

 

Common mistakes while converting square feet to katha

  • Ignoring regional variations: The size of one Katha differs across states and cities. Using a standard conversion factor without checking local norms can lead to inaccurate calculations.
  • Using outdated conversion rates: Land measurement standards may vary based on local revenue records. Relying on outdated information can result in errors.
  • Calculation mistakes: Simple arithmetic errors while multiplying or dividing conversion values can significantly affect the final land area.
  • Confusing Katha with other units: People often mix up Katha with Bigha, Acre, or Square Yard, leading to incorrect property measurements.
  • Not verifying official records: Property documents, survey reports, and revenue records should always be checked before finalising any conversion.
  • Overlooking decimal values: Rounding off figures too early may create discrepancies in land area calculations.
  • Relying on unofficial sources: Online estimates or verbal information may not always be accurate. Always cross-check with authorised land records or professional surveyors for precise measurements.

Things to check before buying katha-based property

  • Ignoring regional variations: The size of one Katha differs across states and cities. Using a standard conversion factor without checking local norms can lead to inaccurate calculations.
  • Using outdated conversion rates: Land measurement standards may vary based on local revenue records. Relying on outdated information can result in errors.
  • Calculation mistakes: Simple arithmetic errors while multiplying or dividing conversion values can significantly affect the final land area.
  • Confusing Katha with other units: People often mix up Katha with Bigha, Acre, or Square Yard, leading to incorrect property measurements.
  • Not verifying official records: Property documents, survey reports, and revenue records should always be checked before finalising any conversion.
  • Overlooking decimal values: Rounding off figures too early may create discrepancies in land area calculations.
  • Relying on unofficial sources: Online estimates or verbal information may not always be accurate. Always cross-check with authorised land records or professional surveyors for precise measurements.

Square feet to katha conversion

Square FeetBihar (Katha)West Bengal (Katha)Assam (Katha)
10000.731.390.35
20001.472.780.69
50003.676.941.74

How to convert square feet to katha?

To convert manually, first identify the state-specific Katha value. Then divide the total square feet by that value. For example, if you have 1361 sq ft in Bihar, divide it by 1361 to get 1 Katha. This method ensures accurate conversion as per regional standards. Always confirm the local unit before finalising any property calculation.

Example conversions

  • 1000 sq ft in Bihar: 1000 ÷ 1361 ≈ 0.73 Katha
  • 2000 sq ft in West Bengal: 2000 ÷ 720 ≈ 2.78 Katha
  • 5000 sq ft in Assam: 5000 ÷ 2880 ≈ 1.74 Katha

These examples show how the same area results in different Katha values due to regional differences.

 

State-wise square feet to katha differences

Bihar conversion details

In Bihar, Katha is widely used in rural land records. It is commonly applied in agricultural and residential land sales. Buyers often rely on Katha for local transactions, but official documents increasingly use square feet for clarity.

West Bengal conversion details

West Bengal uses a smaller Katha value, making conversions more sensitive. It is frequently used in urban fringe areas and older property records. Understanding this difference is important when comparing property prices.

Assam conversion details

Assam uses a much larger Katha size compared to other states. It is mainly used in rural land dealings and agricultural plots. Because of its larger unit size, conversions often result in smaller Katha values for the same square footage.

 

Why understanding this conversion is important?

For property buyers

Buyers can avoid confusion and overpaying by understanding correct conversions. It helps in comparing listings accurately and making informed decisions.

For sellers and agents

Real estate agents and sellers can communicate property size clearly. This builds trust and avoids disputes during negotiations.

Legal and documentation importance

Accurate conversion is important for land records, registry documents, and legal verification. It ensures consistency in official paperwork and reduces errors.

 

Square feet vs Katha vs other land units

UnitRegionStandardization
Sq FtIndia wideStandard
KathaEastern IndiaNot standard
BighaNorth IndiaVaries

Conclusion

Understanding the conversion between square feet and Katha is essential for anyone involved in land transactions in India. While square feet provides a standardized and reliable measurement system, Katha remains deeply rooted in regional land practices. Because Katha varies from state to state, conversions are never universal and must always be verified locally. By learning formulas, tables, and practical examples, buyers and sellers can avoid confusion and make informed decisions. Whether dealing with rural land or urban property, accurate measurement ensures transparency, fair pricing, and legal clarity in real estate dealings.


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Frequently asked questions

How many square feet are in 1 katha?

1 Katha is not fixed everywhere. It typically ranges from about 720 to 1,361 square feet, depending on regional standards, especially in states like Bihar, Assam, West Bengal, and neighboring areas.

Is katha same across India?

No, Katha is not the same across India. Its size varies by region, ranging roughly from 720 to 1,361 square feet, depending on local land measurement systems and state practices.

How to convert square feet to katha manually?

To convert square feet to Katha manually, divide total square feet by the local value of 1 Katha, which varies by region, usually between 720 and 1,361 square feet.

Which states use katha measurement?

Katha measurement is mainly used in eastern India, especially Bihar, West Bengal, Assam, and Jharkhand. However, its size varies by state and is not standardized across the country.

What is Katha in Bihar vs West Bengal?

In Bihar, 1 Katha is generally about 1,361 square feet, while in West Bengal it is usually around 720 square feet. The unit varies significantly between these two states.

Can Katha measurements vary within the same state?

Yes, Katha measurements can vary within the same state due to historical land administration practices and local customs. Different districts may follow different standards for land measurement, leading to variations in the size of one Katha. Before purchasing or valuing land, it is important to verify the locally accepted conversion rate through revenue records, survey documents, or local authorities to avoid discrepancies.

Which unit is more commonly used in urban property transactions, Katha or Square Feet?

In most urban property transactions, Square Feet is the preferred unit because it provides a standard and universally accepted measurement. Apartments, residential plots, and commercial properties are generally advertised and valued in Square Feet. However, Katha is still commonly used in certain regions, especially for land transactions. Buyers often convert Katha into Square Feet for easier comparison and valuation.

How can I verify the Katha measurement mentioned in a sale deed?

You can verify the Katha measurement by checking the property’s survey records, mutation documents, and official land records maintained by local revenue authorities. Comparing the area mentioned in the sale deed with government records helps confirm accuracy. If needed, a licensed surveyor can measure the land and provide a certified report, ensuring that the stated Katha measurement matches the actual property dimensions.

Do banks convert Katha into Square Feet during property valuation?

Yes, banks and financial institutions generally convert Katha into Square Feet during property valuation. Since property prices, construction costs, and market comparisons are commonly calculated in standard units, valuers use Square Feet measurements for consistency. This conversion helps lenders assess the property's market value accurately before approving financial products such as home loans or loans against property.

Is Katha recognised in modern land registration documents?

Katha may still appear in land registration documents in regions where it is traditionally used. However, many modern records also mention standard measurement units such as Square Feet, Square Metres, or Hectares for clarity and uniformity. Government authorities increasingly prefer standard units to reduce confusion, but local land records and sale deeds may continue to reference Katha alongside these measurements.

Can incorrect Katha conversion affect property resale value?

Yes, an incorrect Katha conversion can impact a property's resale value. If the land area is overstated or understated due to conversion errors, buyers may question the property's actual size and pricing. This can lead to valuation disputes, delayed transactions, or reduced buyer confidence. Accurate land measurement helps ensure fair pricing and smooth property transfers in the future.

Are online Square Feet to Katha calculators accurate for legal purposes?

Online calculators are useful for quick estimates but should not be relied upon for legal or official purposes. Since Katha measurements vary across regions, a calculator may not always use the locally applicable conversion rate. For property registration, valuation, or legal documentation, it is advisable to verify measurements using official land records, survey reports, or guidance from local authorities.

What documents should be checked before purchasing Katha-based land?

Before purchasing Katha-based land, review the sale deed, title documents, mutation records, survey maps, encumbrance certificate, and property tax records. These documents help confirm ownership, land dimensions, and legal status. Buyers should also verify the local Katha conversion standard used in official records to ensure that the stated land area accurately reflects the property's actual size.

Why do some districts follow different Katha measurements?

Different Katha measurements exist because land measurement systems evolved locally over time. Historical administrative practices, regional customs, and varying revenue settlement methods contributed to these differences. As a result, the size of one Katha may differ from one district to another. Understanding the locally accepted standard is important for accurate property valuation, registration, and land-related transactions.

Is Katha still used for agricultural land transactions in India?

Yes, Katha continues to be used in agricultural land transactions in several parts of India, particularly in eastern and northeastern states. Farmers, landowners, and local authorities often refer to Katha when describing land area. However, official records may also include standard units such as Hectares or Square Metres to maintain consistency and facilitate legal, administrative, and financial processes.

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