Land Area Units in India: Conversion Guide

This guide is for anyone reading land records in India: a developer’s land team, a plot buyer or a seller. It gives exact factors for standard units only, and it does not give a national value for any regional unit.

In short

• Standard units convert exactly: 1 acre is 43,560 square feet or 4,046.8564224 square metres, and 1 hectare is 10,000 square metres.
• A cent is 435.6 square feet only where it means one-hundredth of an acre. Confirm that against the record.
• Bigha, katha, biswa, ground, guntha, kanal and marla can change with state, district and document. Do not assume one national value.
• Keep the original value and unit, convert to square metres, and store the factor and its source with the result.
• Compare the converted extent across every parcel record before you price the land.

India’s Legal Metrology Act, 2009 bases units of measure on the metric system. Land records and market conversations can still contain acres and regional names, and the Department of Land Resources expressly notes that land administration and nomenclature are diverse across states.

The safe rule is simple: standardized units can be converted mathematically, but a regional unit must first be defined by the parcel’s authoritative context.

Use these exact factors for standard units

The SI unit of area is the square metre. NIST’s area guide confirms the decimal relationships for square metres, ares and hectares. Its conversion-factor guidance gives the acre relationship.

Unit	Exact or published relationship
1 are	100 square metres
1 hectare	10,000 square metres
1 international foot	0.3048 metre
1 square foot	0.09290304 square metre
1 acre	43,560 square feet
1 acre	4,046.8564224 square metres
1 cent, when defined as 1/100 acre	435.6 square feet

From these relationships:

• square metres = square feet × 0.09290304;
• square feet = square metres ÷ 0.09290304;
• hectares = square metres ÷ 10,000; and
• acres = square feet ÷ 43,560.

Keep the unrounded result in the parcel record. Round only for display, and state the rounding used.

Get a source before you convert a regional unit

Names such as bigha, katha, biswa, ground, guntha, kanal and marla can depend on state, district, settlement history or document convention. A web table that assigns one value per state can still be wrong for a specific record.

Before converting a regional unit, capture these six items.

If the source record gives both the local unit and a metric extent, use that parcel-specific relationship and flag any inconsistent documents. Do not select whichever conversion produces the expected price.

Convert in five steps you can repeat

Keep the original value

Store “3 bigha” as an original input, not only the converted number. This keeps the ambiguity visible until it is resolved.

Normalize to one standard unit

Choose square metres for statutory and survey comparison, or another documented internal standard. Store the conversion factor and its source with the output.

Compare every parcel record

Compare the normalized extent across the conveyance, revenue extract, survey record, encumbrance search, approved layout and physical survey. A numerical match does not prove that the boundary is the same, so compare parcel geometry and subdivisions too.

Settle the area before the price

Calculate price per standardized unit only after the area source is settled. Keep asking price, guideline value and registered comparable evidence as separate fields. None of them is automatically the parcel’s market value.

Log every variance

Record the documents compared, conversion factors, absolute difference, percentage difference, possible reason, responsible professional and resolution. Do not silently average conflicting extents.

The land area converter can do the arithmetic once the correct unit definition is known. You remain responsible for choosing the definition that the parcel evidence supports.

What this means for you

A developer’s land team: store each extent as the original value and unit plus a square-metre figure, with the factor and its source. Reconcile the extent across the deed, revenue record and survey record before you set a price per unit.

A single-plot buyer: ask which unit the record uses and where it defines it. If a record prints a metric extent alongside the local unit, use that parcel-specific relationship, flag any documents that disagree, and do not rely on a state-wide table from the web.

A land owner or seller: have the record’s own unit definition and any printed metric extent ready. Do not pick the conversion that produces the price you expect.

What this guide does not prove

It does not publish a national conversion for every regional name, certify a parcel’s extent, determine a price, or reconcile a boundary. Those conclusions require the original records and, where needed, confirmation from the competent revenue or survey authority and a qualified surveyor.