GreenCalculus is a standards-aligned calculation platform for corporate GHG accounting.
Built and maintained for sustainability officers, ESG analysts, environmental engineers, and compliance teams who need every number on a report to trace back to a published standard. Every calculator declares its formula, its emission-factor source, its applicable boundary, and the version of the data it ran against.
Why GreenCalculus exists
Most online carbon calculators used by sustainability professionals fail one or more of three basic tests: they cite no emission factor source, they apply outdated Global Warming Potential values (typically AR4 or AR5 long after AR6 superseded them), and they produce a final number that cannot be traced back through a documented formula. For a quick consumer footprint quiz, none of that matters. For a corporate GHG inventory or a regulatory disclosure, all three are disqualifying.
GreenCalculus exists to close that gap. Every tool on the platform is built to be cited in a report — which means every output has to survive a methodology review by someone who reads the GHG Protocol for a living. The platform’s job is to make standards-aligned calculation infrastructure cheap enough to use casually and rigorous enough to use in formal disclosures.
GreenCalculus is a calculation platform, not a consultancy. It does not produce certified audit outputs, professional environmental advice, or legal compliance opinions. Outputs are estimates derived from published emission factors. Users operating under formal disclosure regimes — CSRD, SEC, SBTi, national ETS — are responsible for confirming applicability with a qualified advisor.
Platform at a glance
Coverage figures are accurate as of the last-reviewed date in the entity card above. Each number links to the source — there is no separate brochure for these claims.
The standards we calculate against
GreenCalculus does not author standards — it implements them. Every calculator derives its formula logic, emission factors, and GWP values from named, versioned, publicly auditable global standards. The platform groups them into three layers: the frameworks that define what to count, the scientific basis that determines what to multiply by, and the disclosure regimes that determine who reads the result.
What to count
What to multiply by
Who reads the result
A further set of standards — including ISO 14067 (Product Carbon Footprint), ISO 14040/14044 (LCA), the F-gas Regulation, the EU ETS, and the Australian Safeguard Mechanism — are referenced where calculator scope requires them. Full standards index →
Browse the standards archive
Every page cites the primary source, names what it governs, and links to the calculators built on it.
Open standards library →
How we publish a calculator: the four rules
The platform applies the same four publication rules to every calculator, every methodology page, and every data reference. They are enforced at the development level — pages that fail any of the four are not published.
No black-box calculations
Every formula appears on the calculator’s methodology tab in full. Inputs map to outputs through explicit, published equations. No hidden multipliers, no proprietary adjustment factors, no “calibrations” applied silently to a final number.
Reproducible by anyone with the standard
Any user with the same inputs and the same cited emission-factor version should be able to reproduce any GreenCalculus output independently. Worked examples — inputs, applicable factor, step-by-step derivation — accompany every methodology page. See for instance the natural gas combustion derivation or the Scope 2 market-based worked example.
Uncertainty stated, boundary stated
Where estimation is necessary — activity data gaps, regional proxy factors, cross-sector boundary assumptions — uncertainty ranges are stated explicitly. Every tool documents which sector, geography, and activity type it covers and, just as importantly, where it should not be applied.
Versioned, with deprecated factors retained
Emission-factor tables are reviewed annually at minimum, triggered by new EPA, DEFRA, and IEA publication cycles. Version control is maintained per tool. A public changelog documents every factor update. Deprecated emission-factor versions are retained for reference — not silently replaced — so historical calculations remain traceable.
See a published methodology page in full
Worked example: how the natural-gas combustion calculator derives its emission factor from the DEFRA 2025 dataset, with full algebra.
View methodology →What we cover (and what we don’t)
Coverage is organised by the GHG Protocol scope framework. Defining what the platform does not cover is part of the brief — the strongest sign a calculation tool is for general use is a long list of disclaimed applications.
Direct emissions
Stationary combustion, mobile combustion, industrial process emissions, and fugitive emissions from owned or controlled sources. Covers manufacturing, transport fleets, the built environment, and agricultural operations.
Purchased energy
Location-based and market-based methods for purchased electricity, steam, heat, and cooling. Regional grid emission intensities from IEA 2026. Full treatment of energy attribute certificates, RECs, REGOs, and power purchase agreements.
Value-chain emissions
All 15 GHG Protocol Scope 3 categories — upstream and downstream. Data quality tiers noted per category. Includes purchased goods and services (Cat. 1), business travel (Cat. 6), use of sold products (Cat. 11), and end-of-life treatment (Cat. 12).
Land & carbon removals
Soil carbon sequestration, forestry and land-use change, biogenic carbon accounting, and engineered carbon dioxide removal (CDR). Fully aligned to the GHG Protocol Land Sector and Removals Standard (2026).
Net-zero targets & pathways
SBTi-aligned near-term and long-term target setting using the absolute contraction approach. Validation against Corporate Net-Zero Standard criteria. FLAG sector targets for land-intensive companies.
Browse the full calculator library
Search by scope, sector, fuel type, or standard. Each tool links to its methodology page and its emission-factor dataset.
Open calculator library →How we verify what we publish
The four rules above describe what gets published. This section describes how the platform proves they have been followed. Three mechanisms run on every page — they are not aspirational, they are part of the publication pipeline.
Source verification
Every emission-factor workbook is verified cell-by-cell against the published standard. If a DEFRA or EPA source workbook updates, the hash changes and the affected calculators are flagged for review before they can update their displayed factor. This rules out silent substitution.
Read the verification process →Calculation verification
Every calculator has a corresponding methodology page that shows the formula, the worked example, and the inputs/output pair used to test the calculator on each release. If the calculator and the methodology page diverge, the calculator does not deploy.
Browse methodology pages →Reviewer accountability
Every page on GreenCalculus.com names the human who authored it and the system that verified it. Corrections are logged publicly with the date, the page affected, the old value, and the new value. Anyone can audit the platform’s history of being wrong.
Read the public changelog →Read the public correction log
Every value change, every methodology revision, every correction submitted by a reader and accepted — dated, attributed, and linked to the affected pages.
View changelog →Cited by Wikipedia
Wikipedia editors apply a documented reliable-source policy (WP:RS) when admitting external citations. The two entries below are instances where GreenCalculus standards pages were selected as the published reference supporting a specific factual claim on the English Wikipedia. Each citation is checkable against the article’s reference list and revision history.
ISO 14064
Footnote 3Wikipedia’s ISO 14064 article cites GreenCalculus as the published reference for the 2026 regulatory landscape around third-party assurance — specifically the section describing how mandatory disclosure regimes including the EU CSRD and frameworks in Singapore, Australia, and Hong Kong require GHG-statement assurance under ISO 14064-3 or its IAASB equivalent ISAE 3410, with most regimes starting at limited assurance and trajectoried toward reasonable assurance by 2028–2030.
Kigali Amendment to the Montreal Protocol
Footnote 19Wikipedia’s Kigali Amendment article cites GreenCalculus as the published reference for the HFC phase-down baseline mechanism for non-Article-5 (developed) countries — specifically that the 15%-of-baseline target by 2036 is calculated as the average HFC consumption between 2011–2013, plus a buffer of 15% of the party’s HCFC baseline to account for the ongoing transition from ozone-depleting substances.
Where we publish our work
GreenCalculus is structured into nine content layers, each with a defined editorial purpose and schema contract. Calculators answer specific questions. Methodology pages prove the calculators’ work. Standards pages cite the external authority. Data pages back up the factors. Case studies show the platform applied. The list below is the full taxonomy — every layer is browsable on its own, from the calculators down to practical guides like our collection of sustainability quotes.
Single-question tools. One input set, one tCO₂e answer, one cited factor.
How the platform applies each standard. Formulas, worked examples, boundary statements.
Reference pages on external standards. What they say, who issues them, what GreenCalculus pages rely on them.
Emission-factor dataset references. Per-fuel, per-mode, per-region lookup tables.
Multi-source workflow tools — readiness checklists, scenario comparisons, lookup utilities.
How-to walkthroughs that link calculators into reporting workflows. Written for sustainability officers.
GHG accounting terms defined to GHG Protocol convention. A–Z reference.
Real-world examples of the platform applied in corporate sustainability work.
Side-by-side comparisons of standards, methods, and accounting choices.
Try a multi-source decision tool
The SBTi readiness checklist runs your inventory against Corporate Net-Zero Standard criteria — covers Scope coverage, base year, FLAG, and target-setting requirements.
Open SBTi readiness tool →Who runs GreenCalculus
GreenCalculus was built out of a specific, repeated frustration with the state of online carbon calculation tools available to sustainability professionals: emission factors with no citation, GWP values lagging the current IPCC assessment by a full report cycle, and outputs that could not be traced back through any documented formula. For internal analysis or for a citation in a published disclosure, those tools were unusable.
Jeremiah personally signs off every methodology page before publication, maintains the MasterBrain data layer that supplies emission-factor values across the platform, and is the named author on every calculation. The verification pipeline (GreenCalculus Engineering) audits the work — Jeremiah is responsible for it.
See a methodology decision worked out in full
Scope 2 location-based vs market-based — when each method applies, what regulators expect, and the algebra behind both.
View comparison →Limits, errors, and how to report them
What outputs are. Estimates derived from published emission factors using documented calculation methodologies. Not certified audit outputs. Not professional environmental, legal, or financial advice. Accuracy is bounded by the quality of user-supplied inputs and the currency of the underlying factors.
Regulatory use. Users operating under specific disclosure frameworks — including but not limited to EU CSRD, SEC climate disclosure rules, IFRS S2, SBTi, or national emissions trading schemes — are responsible for confirming that the applicable emission-factor version and calculation boundary meet their regulatory requirements. The platform’s job is to produce defensible internal numbers; signing them off for a filing is the user’s responsibility, working with qualified advisors.
If you find an error. Email jeremiah@greencalculus.com directly. Include the page URL, the inputs used, the output received, and the standard or dataset you believe conflicts with the result. Methodology corrections receive a response within 3–5 business days, are logged publicly in the changelog, and contributors are credited by name. General enquiries, PR requests, and sponsored content proposals are not accepted at that address — use /contact/.
Terms. Full terms at /terms/; privacy at /privacy/; verification process at /governance/.