Business Carbon Footprint Calculator Scope 1, 2 & 3 — GHG Protocol Methodology

Calculate your organisation's greenhouse gas emissions, get a breakdown by scope, and see a prioritised reduction roadmap.

Company Profile

Scope 1 — Direct Emissions

Combustion and fugitive releases from sources owned or controlled by your organisation.

Scope 1 Total: tCO2e

Scope 2 — Electricity

Indirect emissions from purchased electricity. Grid factor: .

Scope 2 Total: tCO2e (location-based) / tCO2e (market-based)

Scope 3 — Value Chain (select applicable)

Upstream and downstream indirect emissions. Include categories relevant to your organisation.

Scope 3 Total: tCO2e

Carbon Footprint Results

Total tCO2e/year
Scope 1
Scope 2
Scope 3

Per-employee intensity

tCO2e/employee

Carbon neutral offset cost (est. @$30/tonne)

USD

Emissions breakdown by scope

Scope 1: tCO2e (%)
Scope 2: tCO2e (%)
Scope 3: tCO2e (%)

Top Reduction Opportunities

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Business Carbon Footprint: A Guide to Scope 1, 2 & 3 Emissions Measurement

Measuring and managing your organisation's greenhouse gas (GHG) emissions is no longer voluntary for most businesses. Mandatory climate disclosure regulations are rolling out in Australia, the EU, the US (SEC), and India. Supply chain requirements from large corporations increasingly require Scope 3 data from their suppliers. And investors, guided by TCFD and ISSB frameworks, expect credible climate data. Understanding your carbon footprint is the first step toward reducing it.

The GHG Protocol Corporate Standard

The GHG Protocol Corporate Accounting and Reporting Standard is the foundation of corporate climate measurement. It defines three "scopes" to capture the full range of GHG emissions associated with a business's operations. Scope 1 direct emissions include combustion of fossil fuels (natural gas, diesel, petrol, LPG, coal) in company-owned boilers, furnaces, vehicles, and manufacturing processes. Fugitive emissions from refrigerant leaks — particularly HFCs with very high global warming potential — are also Scope 1. Scope 2 indirect emissions from purchased electricity are typically a major source for office-based businesses. The location-based method uses the average grid emission factor for your country or region; the market-based method uses the actual emission factor of your electricity contract (renewable energy certificates reduce this to near-zero). Both must be reported.

Scope 3: The Largest and Most Complex Category

Scope 3 encompasses 15 upstream and downstream categories defined in the GHG Protocol Scope 3 Standard. Upstream categories include: purchased goods and services (often the largest, measured by spend or supplier data), capital goods, fuel and energy-related activities, upstream transport, waste generated in operations, business travel, employee commuting, and upstream leased assets. Downstream categories include: downstream transport, processing of sold products, use of sold products (e.g. energy consumed by software running in data centres), end-of-life treatment, downstream leased assets, and investments (for financial institutions). Not all 15 categories are material for every organisation — the standard requires calculating and reporting all "relevant" categories defined by significance thresholds.

Mandatory Reporting Requirements: India and Australia

In India, SEBI's Business Responsibility and Sustainability Report (BRSR) is mandatory for the NSE/BSE top 1,000 listed companies by market cap since FY2023. BRSR Core — a subset of 49 key performance indicators requiring limited third-party assurance — is being phased in progressively. Scope 1 and 2 emissions are core disclosures; Scope 3 is increasingly expected. India's Carbon Credit Trading Scheme (CCTS) 2023, administered by the Bureau of Energy Efficiency, will create a compliance carbon market for energy-intensive industries, making internal carbon accounting a regulatory necessity. In Australia, Treasury's mandatory climate-related financial disclosure regime (aligned with ISSB IFRS S2) requires large entities (revenue >$500M or assets >$1B from FY2025) to disclose Scope 1, 2, and material Scope 3 emissions with third-party assurance. Mid and smaller entities phase in through 2027.

From Measurement to Reduction

A carbon footprint baseline is only valuable if it drives action. Best practice is to set a science-based target (SBT) covering at least Scope 1, 2, and material Scope 3, then develop a decarbonisation roadmap prioritising the highest-emission categories. High-impact actions depend on your sector but typically include: switching to 100% renewable electricity via Power Purchase Agreement or on-site solar; electrifying fleet vehicles; implementing energy efficiency measures; reducing business air travel; engaging key suppliers on their emission reductions; and measuring and managing building embodied carbon. Organisations should also establish an internal carbon price to embed emission costs into investment decisions — $50-$150/tonne is a common range that influences real business choices.

Frequently Asked Questions

The Greenhouse Gas Protocol (GHG Protocol) is the world's most widely used greenhouse gas accounting and reporting standard, developed jointly by the World Resources Institute (WRI) and the World Business Council for Sustainable Development (WBCSD). It defines the methodology for measuring and reporting corporate greenhouse gas emissions across Scope 1, 2, and 3. Most reporting frameworks — CDP, TCFD, GRI, SASB, ISSB (IFRS S2) — require or recommend GHG Protocol methodology. Using it ensures your emissions data is comparable, credible, and accepted by investors, regulators, and supply chain partners.
Scope 1 covers direct GHG emissions from sources owned or controlled by your organisation — fuel combustion in company vehicles and boilers, process emissions, fugitive refrigerant leaks. Scope 2 covers indirect emissions from the generation of purchased electricity, heat, steam, or cooling consumed by your organisation. Scope 3 covers all other indirect emissions in your value chain — both upstream (purchased goods and services, business travel, employee commuting, capital goods) and downstream (use of sold products, end-of-life treatment, transportation). Scope 3 typically accounts for 70-90% of a company's total carbon footprint but is optional under many current regulations, though increasingly required.
Scope 3 measurement uses several approaches. The spend-based method multiplies financial spend on a category by an industry-specific emission factor (e.g. EEIO data from EPA or Exiobase) — lowest effort, lowest accuracy. The average-data method uses industry average emission factors per unit (kg CO2e per kg of material, per tonne-km of freight, etc.). The supplier-specific method collects actual emission data from your suppliers — highest accuracy but operationally intensive. Most organisations start with spend-based for categories without specific data and move toward supplier-specific for their largest emission categories. The GHG Protocol Scope 3 Standard and category-specific technical guidance documents are freely available at ghgprotocol.org.
Carbon offsets represent emission reductions or removals achieved elsewhere (forestry projects, methane capture, renewable energy) that are purchased to compensate for your own emissions. They are measured in tonnes CO2e and must come from verified projects (Gold Standard, VCS/Verra, ACR). Critics argue that offsets allow organisations to claim carbon neutrality without reducing their own footprint — and some projects have faced integrity questions. The Science Based Targets initiative (SBTi) and most credible net-zero frameworks require actual emission reductions as the primary path, with offsets limited to "residual" emissions that cannot be eliminated. Use offsets as a complement to, not a substitute for, emission reduction.
Carbon neutral typically means an organisation has balanced its annual emissions with offsets or removals, achieving a net-zero figure for a given year. It can include purchasing renewable energy certificates (RECs) or carbon offsets without reducing underlying emissions. Net-zero, as defined by the SBTi Corporate Net-Zero Standard, requires: (1) reducing Scope 1, 2, and Scope 3 emissions by at least 90% from a base year by 2050 or sooner, and (2) neutralising any remaining residual emissions (up to 10%) through permanent carbon removal. The SBTi net-zero standard is increasingly the credible benchmark, distinguishing genuine decarbonisation from "net-zero washing."
TCFD (Task Force on Climate-related Financial Disclosures) provides a framework for disclosing climate-related financial risks and opportunities across four pillars: governance, strategy, risk management, and metrics/targets. It has been adopted into mandatory regulation in the UK, New Zealand, and incorporated into ISSB standards. GRI (Global Reporting Initiative) is a comprehensive sustainability reporting standard used by over 10,000 organisations; GRI 305 covers emissions. ISSB (International Sustainability Standards Board) published IFRS S1 and S2 in 2023 — S2 specifically addresses climate-related disclosures and includes Scope 1, 2, and 3 emissions. Australia mandated ISSB-aligned climate disclosures for large entities from 2025; India has BRSR (Business Responsibility and Sustainability Reporting) as a mandatory framework for listed companies.
Science Based Targets initiative (SBTi) allows companies to set emission reduction targets aligned with climate science — specifically with the Paris Agreement goal of limiting warming to 1.5°C. SBT targets must cover Scope 1, 2, and material Scope 3, with near-term targets (5-10 years) and long-term net-zero targets by 2050. Over 7,000 companies have committed to or set SBTs. For corporate credibility with investors, customers, and regulators, SBT-validated targets are increasingly the gold standard. SBTi validation requires submission of target methodology and independent review.
Voluntary carbon credit prices vary enormously by project type and quality. Nature-based solutions (forest conservation, REDD+) typically trade at $5–$30/tonne CO2e but have faced quality and permanence scrutiny. Technology-based removals (biochar, direct air capture, enhanced weathering) command $50–$1,000+/tonne due to their permanence. Compliance market prices are higher: EU ETS carbon allowances have ranged from €60–€100+/tonne. Australia's carbon credit units (ACCUs) trade around $30–$40/AUD/tonne. India is developing its carbon market under the Carbon Credit Trading Scheme 2023. Budget $20–$50/tonne for credible voluntary credits as a working assumption; avoid the cheapest credits without due diligence.
India: SEBI's Business Responsibility and Sustainability Report (BRSR) is mandatory for the top 1,000 listed companies by market capitalisation from FY2023. BRSR Core (a subset requiring third-party assurance) is phased in progressively. BRSR requires disclosure of Scope 1 and 2 emissions; Scope 3 is expected to become mandatory. India's Carbon Credit Trading Scheme (CCTS) 2023 establishes a compliance carbon market for energy-intensive industries. Australia: mandatory climate-related financial disclosures aligned with ISSB IFRS S2 are phased in from 2025: large entities (>$1B revenue or total assets) must report from FY2025, mid-sized entities from FY2026, and smaller entities from FY2027.
The highest-impact actions depend on your emission profile, but common high-impact levers are: switching to renewable electricity (eliminates Scope 2 entirely — install rooftop solar or purchase PPAs/RECs); electrifying company vehicle fleets (replaces Scope 1 fuel emissions with Scope 2, which can be zero with renewables); improving energy efficiency of buildings and equipment; reducing business air travel (economy flights still emit 0.255 kgCO2e/km per passenger); engaging top suppliers to set their own emission reduction targets (Scope 3 Category 1 — purchased goods — is often the largest category); and eliminating HFC refrigerant leaks (HFCs have very high global warming potential, often 1,000–4,000x CO2). Setting a credible internal carbon price ($50+/tonne) creates financial incentives across the business.

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