Katha, Bigha, Decimal Converter Bangladesh | Land Unit Guide 2026

Anyone buying, selling, or researching land in Bangladesh eventually runs into the same confusion: one listing quotes a price per katha, another per decimal, and a third per bigha. Without a reliable katha, bigha, decimal converter, comparing two plots fairly becomes almost impossible. This guide breaks down the exact formulas, a full conversion table, and the regional quirks that make Bangladeshi land measurement more complicated than it first appears.

At Dreamway Holdings Ltd., we work with buyers and landowners across Bashundhara R/A and greater Dhaka daily, and unit conversion questions come up constantly — especially when comparing plot sizes across different projects, or when a landowner's old paperwork uses units unfamiliar to a younger buyer.

Why Bangladesh Uses Multiple Land Measurement Units

Bangladesh inherited a mix of land measurement traditions from different historical periods and regional customs. Katha and bigha come from older South Asian agrarian measurement systems, while decimal (also called shotangsho) was introduced as a more standardized, metric-friendly unit for official records. Acres appear mostly in larger commercial or agricultural land dealings. As a result, a single plot might be described in katha by a local seller, in decimal on the government khatian, and in acres in a formal appraisal — all referring to the same land.

Katha to Decimal Converter — Formula & Quick Reference

The most commonly used conversion in Dhaka and surrounding districts is:

• 1 katha = 1.65 decimal (approximately)

• 5 katha = 8.25 decimal

• 10 katha = 16.5 decimal

• 20 katha = 33 decimal = 1 bigha

This 1.65-decimal figure is the standard used across most of Dhaka and central Bangladesh, though it's worth double-checking against local land office records, since some districts historically used slightly different katha sizes.

Bigha to Katha Converter — Formula & Quick Reference

Since 1 bigha equals 20 katha in the standard Dhaka-region system, converting between the two is straightforward multiplication or division:

• 1 bigha = 20 katha = 33 decimal

• 0.5 bigha = 10 katha = 16.5 decimal

• 2 bigha = 40 katha = 66 decimal

This ratio makes bigha a convenient unit for describing larger agricultural or peri-urban parcels, while katha remains the go-to unit for residential plot listings in and around Dhaka.

Decimal to Katha & Bigha Conversion

Since land offices and registered deeds record area in decimals, converting back to katha or bigha is often necessary when comparing official paperwork to how a plot was advertised. Divide the decimal figure by 1.65 to get katha, or by 33 to get bigha:

• 50 decimal ÷ 1.65 = ~30.3 katha

• 50 decimal ÷ 33 = ~1.5 bigha

• 100 decimal (1 acre) ÷ 1.65 = ~60.6 katha

Acre and Shotangsho Conversions

An acre is the largest commonly referenced unit in Bangladeshi land dealings, mostly used for agricultural land, large commercial plots, or industrial parcels. One acre equals 100 decimals, which also equals one shotangsho multiplied by 100, since shotangsho and decimal refer to the same base unit in most contexts:

• 1 acre = 100 decimal = 100 shotangsho

• 1 acre = ~60.6 katha

• 1 acre = ~3.03 bigha

For large agricultural or industrial land transactions, acre is typically the clearest unit to compare across regions, since katha size can vary slightly by district.

Full Conversion Table (Katha, Bigha, Decimal, Acre)

The table below summarizes the standard Dhaka-region conversions used throughout this guide:

Regional Variations — Why Katha Size Differs by District

While 1 katha = 1.65 decimal is the standard used in Dhaka and most of central Bangladesh, some districts historically applied slightly different katha sizes, particularly in parts of greater Bengal's older agrarian record systems. This means a katha quoted in a rural district deed may not convert identically to a katha in a Dhaka city listing. When in doubt, always cross-check the decimal figure recorded on the actual khatian rather than relying solely on the katha number quoted verbally by a seller.

Why Getting Land Unit Conversion Right Matters When Buying Property

Unit conversion errors aren't just academic — they directly affect price comparison, registration accuracy, and future mutation applications. A buyer comparing a 3 katha plot in one area against a 5 decimal plot in another needs an accurate conversion to know which is actually larger or better priced per unit. Similarly, deeds and khatians must show area in decimals precisely; a rounding error carried from an informal katha-to-decimal conversion can cause mismatches during registration or mutation later, leading to delays or disputes.

Common Conversion Mistakes to Avoid

• Assuming katha size is identical across all districts without checking local conversion rates

• Rounding 1.65 decimals per katha too aggressively across large plots, compounding small errors

• Confusing shotangsho with katha — they are not the same unit

• Comparing per-katha prices across two plots without converting both to the same base unit first

• Relying on verbal katha figures from sellers instead of the decimal figure recorded on the khatian

A reliable katha, bigha, decimal converter isn't just a convenience — it's essential for making fair price comparisons, avoiding registration errors, and ensuring mutation applications go through smoothly. Whether you're evaluating a small residential plot or a larger agricultural parcel, always convert every option to the same base unit before comparing price or value.

At Dreamway Holdings Ltd., every plot across our Bashundhara R/A projects — including Icon Residence, Serenity, and Dreamway Elysian — comes with precisely verified measurements and full documentation support, so buyers never have to guess whether a katha figure quoted to them matches what's actually on record.

FAQs

How many decimals are in 1 katha?

1 katha equals approximately 1.65 decimals in the standard Dhaka-region measurement system.

How many katha are in 1 bigha?

1 bigha equals 20 katha, or 33 decimals, in most parts of Dhaka and central Bangladesh.

Is shotangsho the same as decimal?

Yes, shotangsho and decimal refer to the same unit and are used interchangeably in Bangladeshi land records.

Does katha size vary by district in Bangladesh?

Yes, some districts historically used slightly different katha sizes, so it's best to verify the decimal figure on the actual khatian rather than relying solely on a quoted katha number.

Land Owners Programme

Dreamway Holdings' Land Owners Programme lets landowners in Bashundhara R/A and nearby zones partner on development instead of selling outright. Owners receive a share of built units or revenue once the project completes. Every land parcel is measured and verified using accurate katha, bigha, and decimal conversion before any agreement is signed.

Land Share Explained in Bangladesh

Land share (jomir bhagshara) refers to a landowner's proportional stake in a joint-venture development, typically split 40:60 or 50:50 between owner and developer. Accurate unit conversion between katha, bigha, and decimal is essential here, since even small measurement errors can shift the calculated share value across a multi-katha plot significantly.

Residential Plots Bashundhara R/A

Bashundhara R/A plots are typically listed in katha, making accurate conversion to decimal or bigha essential when comparing against listings from other areas. Dreamway Holdings develops premium residential projects across several Bashundhara blocks, with precise, verified plot measurements and full documentation support for every ready and under-construction unit sold.

Land Registration Process Bangladesh

Land registration in Bangladesh requires the exact area in decimals for deed drafting and stamp duty calculation, even when land is commonly discussed in katha or bigha. A conversion error at this stage can misstate the registered area, causing complications later during mutation, resale, or inheritance, so double-checking unit conversion before registration is essential.

Mutation & Deed Verification Guide

During mutation, the khatian must show the correct area in decimals, matching the registered deed. Before applying, verify the seller's khatian and mutation status through an online mutation check on land.gov.bd, and confirm the katha-to-decimal conversion used in the deed matches official records to avoid delays or rejected applications.

Land Price Trends Dhaka 2026

Dhaka's land prices in 2026 continue rising in planned residential zones like Bashundhara, Purbachal, and Uttara, driven by limited supply and growing NRB investment. Since prices are often quoted per katha, accurate conversion to decimal or bigha is essential for comparing listings fairly across different areas and developers, including Dreamway Holdings' projects.