--- title: "Land Area Units in India: Conversion Guide" description: "A safe method for converting acres, hectares, square metres, square feet and regional land units without assuming that local names have one national value." author: "Vignesh Nagarajan" author_profile: https://proquiro.com/authors/vignesh-nagarajan date: 2026-04-11 updatedDate: 2026-08-09 category: guide methodology: "Exact arithmetic is published only for standardized units and relationships supported by cited sources. Regional-unit values are treated as locality-specific inputs that must come from the governing record or authority; unsupported state-wide bigha, katha, ground, kanal, marla and guntha tables were removed." sources: [{"title":"Legal Metrology Act, 2009","publisher":"India Code","url":"https://www.indiacode.nic.in/handle/123456789/2102?locale=en","evidence_type":"primary-source","checked_date":"2026-08-09"},{"title":"Digital India Land Records Modernization Programme","publisher":"Department of Land Resources, Government of India","url":"https://dolr.gov.in/en/programmes-schemes/dilrmp-2/","evidence_type":"primary-source","checked_date":"2026-08-09"},{"title":"SI Units — Area","publisher":"National Institute of Standards and Technology","url":"https://www.nist.gov/pml/owm/metric-si/si-units-area","evidence_type":"credible-secondary","checked_date":"2026-08-09"},{"title":"Revised Unit Conversion Factors","publisher":"National Institute of Standards and Technology","url":"https://www.nist.gov/pml/us-surveyfoot/revised-unit-conversion-factors","evidence_type":"credible-secondary","checked_date":"2026-08-09"}] corrections: [{"date":"2026-08-09","summary":"Removed unsupported regional conversion tables, historical explanations, locality conventions, pricing examples, risk percentages, portfolio thresholds, and product capability claims; retained source-backed standard-unit arithmetic and a verification workflow."}] tags: ["land area units", "unit conversion", "acre", "cent", "bigha", "land measurement", "India"] canonical_url: https://proquiro.com/blog/land-area-units-india-conversion-guide --- India's [Legal Metrology Act, 2009](https://www.indiacode.nic.in/handle/123456789/2102?locale=en) bases units of measure on the metric system. Land records and market conversations can still contain acres and regional names, while 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; a regional unit must first be defined by the parcel's authoritative context. ## Exact baseline conversions The SI unit of area is the square metre. [NIST's area guide](https://www.nist.gov/pml/owm/metric-si/si-units-area) confirms the decimal relationships for square metres, ares and hectares. Its [conversion-factor guidance](https://www.nist.gov/pml/us-surveyfoot/revised-unit-conversion-factors) 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. ## Why regional names need a source 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: 1. the original number and spelling; 2. state, district, village and record type; 3. the document date; 4. any metric or acre equivalent printed on the same record; 5. the authority or survey office that confirms the relationship; and 6. whether the value is a legal-record convention, layout convention or informal market usage. If the source record provides both the local unit and metric extent, use that parcel-specific relationship and flag any inconsistent documents. Do not select whichever conversion produces the expected price. ## A reproducible conversion workflow ### 1. Preserve the original Store “3 bigha” as an original input, not merely the converted number. This keeps the ambiguity visible until it is resolved. ### 2. Normalize to a standard unit Choose square metres for statutory and survey comparison or another documented internal standard. Store the conversion factor and source with the output. ### 3. Reconcile all parcel records 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; compare parcel geometry and subdivisions too. ### 4. Separate area from 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 is automatically the parcel's market value. ### 5. Log variances 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](/tools/land-area-converter) can perform arithmetic once the correct unit definition is known. The user remains responsible for selecting the definition supported by the parcel evidence. ## 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. ## Sources and editorial notes ### Methodology Exact arithmetic is published only for standardized units and relationships supported by cited sources. Regional-unit values are treated as locality-specific inputs that must come from the governing record or authority; unsupported state-wide bigha, katha, ground, kanal, marla and guntha tables were removed. ### Sources - [Legal Metrology Act, 2009](https://www.indiacode.nic.in/handle/123456789/2102?locale=en) — India Code; primary-source; checked 2026-08-09 - [Digital India Land Records Modernization Programme](https://dolr.gov.in/en/programmes-schemes/dilrmp-2/) — Department of Land Resources, Government of India; primary-source; checked 2026-08-09 - [SI Units — Area](https://www.nist.gov/pml/owm/metric-si/si-units-area) — National Institute of Standards and Technology; credible-secondary; checked 2026-08-09 - [Revised Unit Conversion Factors](https://www.nist.gov/pml/us-surveyfoot/revised-unit-conversion-factors) — National Institute of Standards and Technology; credible-secondary; checked 2026-08-09 ### Updates and corrections - 2026-08-09: Removed unsupported regional conversion tables, historical explanations, locality conventions, pricing examples, risk percentages, portfolio thresholds, and product capability claims; retained source-backed standard-unit arithmetic and a verification workflow.