Bigha, Katha & Lessa Explained: The Complete Assam Land Measurement Guide (2026)

Why Assam Uses Its Own Land Measurement System

India is a diverse country with a patchwork of land measurement traditions that predate colonial rule. While the British attempted to standardize measurements, many Indian states retained their own local units for measuring agricultural land. Assam is one such state.

The Bigha-Katha-Lessa system used in Assam has roots in the Ahom kingdom era (13th to 19th century), where land assessment for taxation was calculated in these traditional units. When the British created their colonial revenue records in Assam, they largely kept the existing system and simply mapped it to survey measurements. Today, the Assam government's official ILRMS (Dharitree) portal continues to record land areas in these traditional units.

Understanding these units is not just academic interest — it is a practical financial necessity. Land deals in Assam are quoted in Bighas, farmers express their land size in Kathas, and your official government record will always show Lessa fractions. Without this knowledge, you cannot verify if a seller is offering you the correct area.

The Three Core Units Explained

Bigha (বিঘা)

The Bigha is the primary, most widely used unit for describing larger pieces of land in Assam. When a farmer says he owns "5 Bigha of land", that roughly translates to about 1.65 Acres or 0.67 Hectares. A Bigha in Assam is also sometimes informally called a "Pura Bigha" to distinguish it from the smaller Bigha used in states like UP or Bihar.

1 Assam Bigha = 14,400 Square Feet (exactly)

Katha (কাঠা)

The Katha is the mid-range unit, most commonly used for residential and urban plots. When buying a house site in towns like Jorhat or Silchar, the plot size is almost always quoted in Kathas. One full Bigha is divided into exactly 5 Kathas.

1 Katha = 2,880 Square Feet

An average 3-bedroom urban house in Assam is typically built on a plot of about 1.5 to 2 Kathas.

Lessa (লেচা)

The Lessa is the smallest standard unit in Assam's land measurement system. It is rarely used in everyday conversation but always appears in the detailed area breakdown shown on your Jamabandi record. Understanding Lessa is critical when you're doing exact arithmetic on inherited land partition (Batwara), where fractions of a Katha must be calculated precisely.

1 Lessa = 144 Square Feet (12 x 12 feet — exactly one square rod)

One Katha contains exactly 20 Lessa, and one Bigha contains 100 Lessa.

Complete Conversion Table – Bigha, Katha, Lessa to All Units

Converting Bigha to Internationally Recognized Units

In government tenders, large industrial projects, and international agricultural investments, land size is always expressed in Hectares or Acres. Here is how Assam's units map to these global standards:

Bigha vs. Acre

1 Acre = 43,560 Square Feet

Therefore: 1 Acre ÷ 14,400 = approximately 3.025 Bigha

Conversely: 1 Bigha = approximately 0.3306 Acres

A practical way to remember this: "3 Bigha makes roughly 1 Acre".

Bigha vs. Hectare

1 Hectare = 10,000 Square Meters = 107,639 Square Feet

Therefore: 1 Hectare = approximately 7.47 Bigha

Conversely: 1 Bigha = approximately 0.1338 Hectares

How to Read Your Jamabandi Area Entry on Dharitree

When you look up your land on the Dharitree ILRMS portal, the area column in the Jamabandi will typically display the land size in a format like:

This means the plot has an area of 2 Bigha, 3 Katha, and 15 Lessa. Let's calculate this in Square Feet:

• 2 Bigha = 2 × 14,400 = 28,800 sq ft
• 3 Katha = 3 × 2,880 = 8,640 sq ft
• 15 Lessa = 15 × 144 = 2,160 sq ft
• Total = 39,600 Square Feet (approximately 0.91 Acres)

The Jamabandi may also show area in the "Rupit" (cultivable land) and "Faringati" (barren/uncultivable) sub-categories. The total area is the sum of these two types.

Common Traps When Buying Land in Assam

Unscrupulous sellers and middlemen sometimes exploit the unit system to confuse buyers. Here are the most common tricks you should know before signing any agreement:

🚨 Trap 1: Mixing Assam Bigha with UP Bigha

A seller might quote the price of land "per Bigha" without specifying which Bigha. If you assume it's Assam Bigha (14,400 sq ft) but they mean the larger UP Bigha, you might pay the correct total but receive land calculated on a smaller unit — effectively getting cheated on area.

🚨 Trap 2: Selling Kacha Land as Rupit

Jamabandi records distinguish land types. "Rupit" land is classified as cultivable (paddy field) with higher value. "Kacha" or "Faringati" land (waterlogged, rocky, or barren) is worth much less. Some sellers show only the Rupit area in the agreement but include barren land in the actual plot dimensions.

🚨 Trap 3: Not accounting for Government Khamar Land

In some areas of Assam, portions of land registered in the Jamabandi are classified under "Khamar" (government reserve) despite appearing in private records. Such land cannot be sold. Always verify the full land classification in the Jamabandi before purchase.

How Assam's Units Differ From Other Indian States