HomeSources

Check the references

Sources and official verification links

See the references used in GharGanit calculations, then open 72 independent government and standards resources for deeper verification.

Formula evidence

Sources directly used by the calculators

These records support a formula, factor or explanation in GharGanit. Each calculator lists only the sources that apply to that tool.

official

Standards & Labelling Programme

Bureau of Energy Efficiency, Government of India

Used to explain why the model label is the preferred source for appliance energy information. No star-rating consumption figures are invented.

Appliance energy labelsAccessed 2026-07-16

Open source

official

Grid Connected Rooftop Solar Programme

Ministry of New and Renewable Energy, Government of India

Used for programme context only. Solar yield remains a user-entered location assumption.

Rooftop solar contextAccessed 2026-07-16

Open source

official

Metadata and Data Standards: Measurement Conversion Table

Department of Land Resources / API Setu, Government of India

Provides selected state-specific land-record conversion factors and demonstrates why local context is mandatory.

Regional land unitsAccessed 2026-07-16

Open source

official

Agricultural Statistics Manual — State-wise local area units

Ministry of Statistics and Programme Implementation, Government of India

Cross-reference for selected state units. Rounded published factors are labelled approximate.

Regional land unitsAccessed 2026-07-16

Open source

standard

NIST Guide to the SI — Area conversion factors

National Institute of Standards and Technology

Used for standard square-foot, square-metre and acre relationships.

Standard area conversionsAccessed 2026-07-16

Open source

official

West Bengal civil audit — KMDA land measurement note

Comptroller and Auditor General of India

The official audit states that one cottah equals 720 square feet in the described KMDA context. GharGanit labels this customary and does not present it as one statewide legal factor.

West Bengal Cottah / Katha in a Kolkata metropolitan land contextAccessed 2026-07-19

Open source

official

Measures relating to safety and electric supply regulations

Central Electricity Authority, Government of India

Supports the safety boundary shown on backup, inverter, pump and EV calculations; it is not used to invent equipment performance.

Electrical installation and safety contextAccessed 2026-07-19

Open source

official

CPWD civil specifications, Volume II

Central Public Works Department, Government of India

Provides specification context for material work. Calculator dimensions, mixes, coverage and wastage remain user-entered planning assumptions.

Brickwork, mortar, concrete and construction specificationsAccessed 2026-07-19

Open source

standard

Know Your Standard search

Bureau of Indian Standards

Used to direct readers to the current standard record rather than copying paywalled or outdated specification text.

Current Indian Standards for building materials and constructionAccessed 2026-07-19

Open source

engineering-reference

Documented dimensional-analysis formulas

GharGanit editorial methodology

Formulas are derived from units and expose every editable efficiency, density, dry-volume and wastage assumption.

Electricity, battery and material quantity calculationsAccessed 2026-07-16

Open source

Independent verification · links checked 30 July 2026

72 official resources, organised by task

These links are selected because they are relevant government, regulator, standards or public-research destinations. They are not paid placements, endorsements or automatic proof that one rule applies to every property, appliance or project. For reuse guidance, see how to cite GharGanit.

13 official links

Electricity and appliance efficiency

Official resource

BEE Standards & Labelling programme

Bureau of Energy Efficiency, Government of India

Understand appliance star labels and the energy information shown on them.

Open BEE Standards & Labelling programme

Official resource

BEE appliance check-testing process

Bureau of Energy Efficiency, Government of India

See how registered appliance performance claims are checked for compliance.

Open BEE appliance check-testing process

Official resource

BEE star-label QR and mobile tools

Bureau of Energy Efficiency, Government of India

Verify model information from the label database instead of guessing from star count.

Open BEE star-label QR and mobile tools

Official resource

BEE appliance-efficiency portal

Bureau of Energy Efficiency, Government of India

Find current appliance-efficiency programmes, reports and star-labelling resources.

Open BEE appliance-efficiency portal

Official resource

Electricity consumer-rights information

Ministry of Power, Government of India

Use the ministry’s current consumer-rights, rules and policy links rather than an old summary.

Open Electricity consumer-rights information

Official resource

Electrical safety and supply regulations

Central Electricity Authority, Government of India

Check current safety regulations before electrical installation or alteration work.

Open Electrical safety and supply regulations

Official resource

Electricity distribution planning resources

Central Electricity Authority, Government of India

Review official metering, network-planning and distribution-technology guidance.

Open Electricity distribution planning resources

Official resource

Electricity Rights of Consumers rules

Ministry of Power, Government of India

Find the notified consumer-rights rules and amendments before checking a billing or service issue.

Open Electricity Rights of Consumers rules

Official resource

CEA metering regulations

Central Electricity Authority, Government of India

Review current official requirements for electricity-meter installation, operation, reading and testing.

Open CEA metering regulations

Official resource

Residential energy-efficiency code

Bureau of Energy Efficiency, Government of India

Understand the official residential-building efficiency framework and its supporting tools.

Open Residential energy-efficiency code

Official resource

Search and compare BEE-labelled appliances

Bureau of Energy Efficiency

Look up a specific registered model instead of estimating its performance from a generic product type.

Open Search and compare BEE-labelled appliances

Official resource

State electricity regulator directory

Forum of Regulators

Find the relevant state commission for current tariff orders, supply codes and consumer regulations.

Open State electricity regulator directory

Official resource

National Consumer Helpline

Department of Consumer Affairs, Government of India

Use the official consumer-grievance service when a provider complaint needs escalation beyond calculation.

Open National Consumer Helpline

12 official links

Backup power and rooftop solar

Official resource

National Power Portal

Ministry of Power, Government of India

Use the national portal for official power-sector data and reporting context.

Open National Power Portal

Official resource

PM Surya Ghar rooftop-solar portal

Government of India

Check the official residential rooftop-solar process, eligibility and portal services.

Open PM Surya Ghar rooftop-solar portal

Official resource

Grid-connected rooftop solar programme

Ministry of New and Renewable Energy, Government of India

Read official rooftop-solar programme context before making a project decision.

Open Grid-connected rooftop solar programme

Official resource

Approved solar PV models and manufacturers

Ministry of New and Renewable Energy, Government of India

Check the current ALMM information where it applies to the planned solar project.

Open Approved solar PV models and manufacturers

Official resource

Renewable-energy schemes and guidelines

Ministry of New and Renewable Energy, Government of India

Verify current scheme documents instead of relying on old subsidy summaries.

Open Renewable-energy schemes and guidelines

Official resource

National Institute of Solar Energy

Ministry of New and Renewable Energy, Government of India

Find official solar research, training and resource information.

Open National Institute of Solar Energy

Official resource

Rooftop-solar application documents

Ministry of New and Renewable Energy, Government of India

Read the current national-portal procedure and calculator guidance before starting an application.

Open Rooftop-solar application documents

Official resource

Solar standards and quality-control documents

Ministry of New and Renewable Energy, Government of India

Check current testing and quality-control documents for PV modules, inverters and storage batteries.

Open Solar standards and quality-control documents

Official resource

CEA grid-connectivity standards

Central Electricity Authority, Government of India

Review the official grid-connectivity standards before planning a grid-connected generation system.

Open CEA grid-connectivity standards

Official resource

Solar resource assessment programme

National Institute of Solar Energy

Understand how measured solar-radiation data supports location-specific generation estimates.

Open Solar resource assessment programme

Official resource

Rooftop-solar knowledge centre

Ministry of New and Renewable Energy, Government of India

Read official consumer, installation, operation and maintenance guidance for rooftop PV systems.

Open Rooftop-solar knowledge centre

Official resource

State and DISCOM rooftop-solar portals

Ministry of New and Renewable Energy, Government of India

Open the relevant DISCOM portal and verify its current empanelled-vendor process instead of relying on a seller claim.

Open State and DISCOM rooftop-solar portals

18 official links

Construction standards and building science

Official resource

BIS standard-review search

Bureau of Indian Standards

Find the current record for an Indian Standard, including concrete, masonry and reinforcement standards.

Open BIS standard-review search

Official resource

Know Your Standard search

Bureau of Indian Standards

Look up an Indian Standard by number or material keyword and check its current record.

Open Know Your Standard search

Official resource

CPWD civil specifications, Volume II

Central Public Works Department, Government of India

Browse public specifications for brickwork, concrete, mortar and reinforced concrete work.

Open CPWD civil specifications, Volume II

Official resource

CPWD civil specification updates

Central Public Works Department, Government of India

Check current correction slips and technical updates before relying on an older specification.

Open CPWD civil specification updates

Official resource

Model Building Bye-Laws

Ministry of Housing and Urban Affairs, Government of India

Review the national model, then verify the building rules adopted by the local authority.

Open Model Building Bye-Laws

Official resource

CPWD technical circulars

Central Public Works Department, Government of India

Check current public-works circulars, specifications and quality-assurance updates.

Open CPWD technical circulars

Official resource

CPWD technical publications

Central Public Works Department, Government of India

Browse official specifications and schedules; do not treat national schedules as a local quote.

Open CPWD technical publications

Official resource

CPWD works manuals

Central Public Works Department, Government of India

Review government works procedures and quality-management references.

Open CPWD works manuals

Official resource

Hazard and disaster-mitigation resources

Building Materials and Technology Promotion Council

Use official hazard resources to understand why location affects professional design checks.

Open Hazard and disaster-mitigation resources

Official resource

Earthquake-resistant housing guidance

Building Materials and Technology Promotion Council

Read public guidance on earthquake-resistant housing and applicable standards.

Open Earthquake-resistant housing guidance

Official resource

IITK–BMTPC Earthquake Tips

IIT Kanpur and Building Materials and Technology Promotion Council

Use the illustrated series for general awareness, not as a substitute for structural design.

Open IITK–BMTPC Earthquake Tips

Official resource

CSIR–Central Building Research Institute

Council of Scientific and Industrial Research, Government of India

Find public building-science research, technologies and technical resources.

Open CSIR–Central Building Research Institute

Official resource

National Building Code overview

Bureau of Indian Standards

Understand the scope of the National Building Code and why final design needs the applicable code provisions.

Open National Building Code overview

Official resource

Standardized Development and Building Regulations

Bureau of Indian Standards

Open the state- and UT-specific model documents, then confirm what the local authority has adopted.

Open Standardized Development and Building Regulations

Official resource

Urban planning and development guidelines

Ministry of Housing and Urban Affairs, Government of India

Browse official planning guidance, including URDPFI resources, for broader site and development context.

Open Urban planning and development guidelines

Official resource

Vulnerability Atlas of India

Building Materials and Technology Promotion Council

Check state and district hazard context before treating a quantity estimate as a safe design decision.

Open Vulnerability Atlas of India

Official resource

Building disaster-mitigation resources

Building Materials and Technology Promotion Council

Find official earthquake, cyclone, flood and hazard-aware construction guidance.

Open Building disaster-mitigation resources

Official resource

CSIR building-research publications

CSIR–Central Building Research Institute

Browse public building-research notes covering materials, thermal design, brickwork and construction science.

Open CSIR building-research publications

29 official links

Land records and area measurement

Official resource

Digital India Land Records Modernization Programme

Department of Land Resources, Government of India

Understand how land records are administered and digitised across states and territories.

Open Digital India Land Records Modernization Programme

Official resource

State and UT land-record digitisation dashboard

Department of Land Resources, Government of India

Review state-level Record of Rights availability and digitisation progress on the current DILRMP dashboard.

Open State and UT land-record digitisation dashboard

Official resource

Andhra Pradesh Mee Bhoomi

Government of Andhra Pradesh

Check Andhra Pradesh land-record services and the parcel’s recorded area.

Open Andhra Pradesh Mee Bhoomi

Official resource

Bihar Bhoomi

Government of Bihar

Check Bihar land records and local measurement context.

Open Bihar Bhoomi

Official resource

Chhattisgarh Bhuiyan

Government of Chhattisgarh

Check Chhattisgarh land records and parcel details.

Open Chhattisgarh Bhuiyan

Official resource

Goa land-record services

Directorate of Settlement and Land Records, Government of Goa

Use Goa’s official settlement and land-record services.

Open Goa land-record services

Official resource

Gujarat AnyRoR

Government of Gujarat

Check Gujarat Record of Rights information and local area context.

Open Gujarat AnyRoR

Official resource

Himachal Pradesh Himbhoomi

Government of Himachal Pradesh

Check Himachal Pradesh land records for the relevant tehsil and village.

Open Himachal Pradesh Himbhoomi

Official resource

Rajasthan Apna Khata

Government of Rajasthan

Check Rajasthan land records and the parcel’s recorded measurement context.

Open Rajasthan Apna Khata

Official resource

Jharkhand Jharbhoomi

Government of Jharkhand

Check Jharkhand land records and regional unit context.

Open Jharkhand Jharbhoomi

Official resource

Karnataka Bhoomi

Government of Karnataka

Check Karnataka Record of Rights, tenancy and crop information services.

Open Karnataka Bhoomi

Official resource

Haryana Jamabandi

Government of Haryana

Check Haryana land records and the official area shown for the relevant parcel.

Open Haryana Jamabandi

Official resource

Manipur Loucha Pathap

Government of Manipur

Check official Manipur land-record information and local units.

Open Manipur Loucha Pathap

Official resource

Odisha Bhulekh

Government of Odisha

Check Odisha Record of Rights information and recorded parcel area.

Open Odisha Bhulekh

Official resource

Punjab Jamabandi

Government of Punjab

Check Punjab land records and the local measurement shown in the official record.

Open Punjab Jamabandi

Official resource

Tamil Nadu land-record e-services

Government of Tamil Nadu

Check official Tamil Nadu land-record and patta/chitta services.

Open Tamil Nadu land-record e-services

Official resource

Tripura Jami

Government of Tripura

Check Tripura land records and parcel measurement details.

Open Tripura Jami

Official resource

Uttarakhand Bhulekh

Government of Uttarakhand

Check Uttarakhand Record of Rights and local area context.

Open Uttarakhand Bhulekh

Official resource

Uttar Pradesh Bhulekh

Government of Uttar Pradesh

Check Uttar Pradesh Record of Rights and recorded land area.

Open Uttar Pradesh Bhulekh

Official resource

West Bengal Banglarbhumi

Government of West Bengal

Check West Bengal land and land-reform records before using a regional factor.

Open West Bengal Banglarbhumi

Official resource

National Generic Document Registration System

Department of Land Resources, Government of India

Find official registration-system information for participating states and territories.

Open National Generic Document Registration System

Official resource

Department of Land Resources

Ministry of Rural Development, Government of India

Use the department’s current programmes, notices and land-governance resources.

Open Department of Land Resources

Official resource

NIST SI area conversion factors

National Institute of Standards and Technology

Verify standard international area-unit relationships separately from regional Indian units.

Open NIST SI area conversion factors

Official resource

Assam Integrated Land Records Management System

Revenue and Disaster Management, Government of Assam

Use Assam’s official gateway for Dharitree, cadastral maps and other land-record services.

Open Assam Integrated Land Records Management System

Official resource

Maharashtra Bhumi Abhilekh

Department of Land Records, Government of Maharashtra

Check official Maharashtra land-record, survey, map and measurement services.

Open Maharashtra Bhumi Abhilekh

Official resource

Madhya Pradesh Bhulekh

Government of Madhya Pradesh

Check Madhya Pradesh land records, maps and certified-copy services for the relevant parcel.

Open Madhya Pradesh Bhulekh

Official resource

Kerala Ente Bhoomi

Government of Kerala

Use Kerala’s integrated survey, revenue and registration portal where digital-resurvey services are available.

Open Kerala Ente Bhoomi

Official resource

Telangana Bhu Bharati

Revenue Department, Government of Telangana

Check Telangana land-record details and current citizen services on the official state portal.

Open Telangana Bhu Bharati

Official resource

Delhi Bhulekh

Revenue Department, Government of NCT of Delhi

Check official Delhi land-record computerisation and Khasra/Khatauni information.

Open Delhi Bhulekh