Bigha to Katha Conversion: Formula and Examples

In summary

Bigha and katha are traditional land-measurement units used in parts of India. Their conversion depends on the local system, so you need to identify the applicable value before calculating the area.

• Formula: Katha = Bigha × number of katha in 1 bigha
• For example: Under a commonly used Assam convention, 1 bigha = 5 katha
• Reverse formula: Bigha = Katha ÷ number of katha in 1 bigha
• Regional variation: The size of a bigha and a katha can differ across states and local land systems
• Formal use: Revenue records and the applicable local measurement convention should guide property-related calculations

For property comparisons or formal documents, use the same conversion consistently and compare the result with the area stated in the relevant plan, sale deed, or registered property record.

Last updated: 13th October, 2026

To convert bigha to katha, multiply the land area in bigha by the number of katha defined as one bigha in the relevant region.

Formula: Katha = Bigha × Katha in 1 bigha

For example, under the commonly used Assam convention of 1 bigha = 5 katha:

• 1 bigha = 5 katha
• 2 bigha = 2 × 5 = 10 katha
• 3 bigha = 3 × 5 = 15 katha
• 4 bigha = 4 × 5 = 20 katha

These calculations apply only when the property follows that convention. Do not use the same factor for a property in another state without confirming its local definition.

The bigha-to-katha conversion varies because both are traditional area units whose definitions can differ across regional land-measurement systems. Neither unit has one universal value that applies to every state in India. For example, Assam government documents describe a convention in which 1 bigha equals 5 katha. Other regional systems can define the units differently. Even documents associated with the same state may use different measurement bases, so the relevant land record matters more than the unit names alone.

Before converting, check:

• The state, district and locality where the property is situated
• The conversion basis used in the property or revenue record
• Whether the document records the land in bigha, katha, a smaller local unit or a standard unit such as square feet

If two sources give different values, do not average them. Use the convention applicable to the specific property record.

To calculate bigha to katha, multiply the number of bigha by the region-specific number of katha in one bigha. The example below uses the commonly used Assam convention of 1 bigha = 5 katha. 

Suppose Ravi, aged 40, is reviewing agricultural land recorded as 3 bigha in Assam. If the relevant record follows this convention, the calculation is: 3 × 5 = 15 katha

Ravi can use the result to compare area figures in documents that follow the same measurement system. If the property record uses a different convention, he must recalculate using that basis. The physical area of the land does not change; only the numerical result expressed in the local units changes.

To convert katha to bigha, divide the number of katha by the number of katha in one bigha under the applicable regional system.

Formula: Bigha = Katha ÷ Katha in 1 bigha

Under the Assam convention used in the example:

• 5 katha ÷ 5 = 1 bigha
• 10 katha ÷ 5 = 2 bigha
• 15 katha ÷ 5 = 3 bigha
• 20 katha ÷ 5 = 4 bigha

You can use reverse conversion to check a calculation. For instance, 15 katha converts back to 3 bigha under this convention. Confirm the regional factor before applying the formula to another property.

An area conversion calculator can perform the arithmetic after you select the relevant units and enter the land area. For traditional units such as bigha and katha, check whether the calculator supports both units and the applicable regional conversion.

For example, to convert 3 bigha to katha under a commonly used Assam convention of 1 bigha = 5 katha:

1. Select the relevant state, if the calculator offers this option.
2. Select bigha as the starting unit.
3. Select katha as the target unit.
4. Enter 3 as the land area.
5. Review the converted value.

Using the stated Assam convention, the result is: 3 × 5 = 15 katha

For a formal property transaction, compare the converted figure with the area stated in the relevant sale deed, land record or registered property document. Confirm that the calculator uses the same regional measurement convention before relying on the result.

Bigha and katha are traditional area units used in parts of India, particularly in land records and property discussions. Their exact values depend on the regional measurement system.

Bigha is commonly used to describe land area in parts of India, including states such as Assam, West Bengal, Bihar, Uttar Pradesh and Rajasthan. Katha is another traditional land-measurement unit used in several regions, including Assam, West Bengal and Bihar. The relationship between bigha and katha varies by local measurement system.

Converting bigha to katha can help you compare land area when property listings, land records or other documents use these units. For example, under a commonly used Assam convention, 1 bigha equals 5 katha. Before using this conversion, confirm the applicable regional definition, particularly when comparing property records or making a formal transaction.

Use bigha when a local property record, land description or listing uses that unit. Use katha when you need to express the same land area in the smaller unit recognised by the applicable regional measurement system. The practical distinction is in how the same area is expressed.

For example, under a commonly used Assam convention:

• A local land record may describe a plot as 3 bigha.
• The same area equals 15 katha.
• The physical plot size does not change.

For a local property comparison, use the unit familiar in the relevant region. When comparing land records, property plans or documents that use different units, confirm the applicable bigha-to-katha conversion before comparing the figures.

Bigha can also be expressed in katha and standard area units, but the conversion depends on the regional definition of bigha. The following examples use a commonly used Assam convention.

Under this Assam convention, 1 bigha equals 5 katha. Square feet and square metres are standard area units that can help you compare land measurements across documents using different units.

Land area is one of the factors considered when assessing property value. Suppose a property listing states the plot area in bigha while a valuation document or plan records it in katha. Converting both measurements using the applicable regional convention can help you check whether they describe a consistent land area.

Accurate measurement can support:

• Comparing property areas
• Reviewing plot size
• Understanding valuation reports
• Checking plans or sale deeds
• Comparing property records

Area alone does not determine property value. Location, property type, permitted use, access, development, legal status, condition and market conditions can also influence valuation. If you are considering property-backed borrowing, a mortgage loan involves a separate assessment of the property, its documents and its valuation rather than relying only on a bigha-to-katha conversion.

Correct land measurement can support property assessment for a loan against property, particularly when different property documents express the same area using different units. However, converting bigha to katha does not determine loan eligibility, the eligible loan amount or guarantee approval.

A lender separately assesses factors such as:

• Property area and type
• Property location
• Ownership documents
• Legal and technical aspects
• Property valuation
• Income and repayment capacity

If one document records a property in bigha and another uses katha, converting them with the correct regional factor can help you check whether both measurements describe the same area before property assessment. Since the relationship between bigha and katha varies by region, confirm the applicable land-record convention before relying on the converted figure.

You can compare loan against property interest rates when reviewing potential borrowing costs. You can also use a loan against property EMI calculator to estimate repayments based on the loan amount, interest rate, and tenure. EMI stands for Equated Monthly Instalment. Planning to avail of property-backed finance. Check eligibility for a loan against property with Bajaj Finance and find out how much you can borrow.

You may also need to convert bigha and katha into other area units when comparing land records or property documents. Confirm the relevant regional convention before using any conversion involving a traditional unit.