Open methodology mapping for the global greenhouse gas accounting standards that GreenCalculus calculators implement.
This repository documents how GreenCalculus calculators align with the global standards governing corporate greenhouse gas accounting. Every calculator on greencalculus.com is built on top of one or more of the 16 standards mapped here.
The intent is simple: a sustainability officer, auditor, or CSRD reviewer should be able to read these documents alongside any GreenCalculus output and verify, line by line, that the methodology is sound.
This repository is the open-methodology mirror. The canonical, fully-styled standards pages live at greencalculus.com/standards — each standard below links to both the GitHub markdown summary and the live reference page.
Each row links to the GitHub mapping document and the live reference page on greencalculus.com. As of May 2026, every actively-implemented standard now has a published GitHub mapping document.
| Standard | Operative version | GitHub doc | Live reference |
|---|---|---|---|
| GHG Protocol Corporate Standard | 2026 revision | doc | Live page → |
| GHG Protocol Scope 2 Guidance | 2015 (revisions in progress) | doc | Live page → |
| GHG Protocol Scope 3 Standard | 2011 — Phase 1 revision Mar 2026 (draft); final ~2027 | doc | Live page → |
| GHG Protocol Land Sector and Removals | v1.0 — 30 Jan 2026 (effective 1 Jan 2027) | doc | Live page → |
| IPCC 2006 Guidelines for National GHG Inventories | 2006 (with 2019 Refinement) | doc | Live page → |
| Standard | Operative version | GitHub doc | Live reference |
|---|---|---|---|
| IPCC AR6 — 100-year GWPs | AR6 (2021) | doc | Live page → |
| Standard | Operative version | GitHub doc | Live reference |
|---|---|---|---|
| ISO 14064-1 — organisation-level GHG quantification | 2018 revision | doc | Live page → |
| ISO 14067 — product carbon footprint | 2018 | doc | Live page → |
| ISO 14040 / 14044 — life cycle assessment | 14040:2006, 14044:2006 (amendments 2017, 2020) | doc | Live page → |
| BS EN 15978 — embodied carbon in buildings | 2011 (revision in progress) | doc | Live page → |
| Standard | Operative version | GitHub doc | Live reference |
|---|---|---|---|
| CSRD / ESRS E1 — Climate change | ESRS Set 1 + Omnibus I (EU 2026/470) | doc | Live page → |
| TCFD Recommendations | 2017 framework — disbanded Oct 2023; monitoring with IFRS Foundation / ISSB | doc | Live page → |
| Framework | Operative version | GitHub doc | Live reference |
|---|---|---|---|
| SBTi Corporate Net-Zero Standard | v1.2 (v2 consultation completed Dec 2025) | doc | Live page → |
| RE100 — Technical Criteria | 2024 update | doc | Live page → |
| Source | Operative version | GitHub doc | Live reference |
|---|---|---|---|
| UK DEFRA / DESNZ GHG Conversion Factors | 2025 v1 (2026 set due Q3 2026) | doc | Live page → |
| EU F-Gas Regulation (2024/573) | In force March 2024 | doc | Live page → |
See INDEX.md for the full registry, including standards we monitor but do not yet implement.
If you are a sustainability officer or auditor — open the standard you care about and read the "How GreenCalculus implements this" section. Each document tells you which calculators on the live site use this standard, and links to the canonical reference page at greencalculus.com/standards.
If you are a researcher or journalist — every standard document includes a citation block. You may cite this repository under CC-BY-4.0 (see LICENSE). The live reference at greencalculus.com is the canonical version.
If you are a developer building your own carbon tools — the structured fields at the top of each standard document (operative version, scope, effective date, citation) are stable and machine-readable. You may copy them, fork them, or use them as a template.
If you cite this repository in academic work, ESG disclosures, or methodology documents, please use:
GreenCalculus (2026). GreenCalculus Standards Alignment. Version 1.0. https://github.com/greencalculus/greencalculus-standards
The canonical, fully-cited version of each standard mapping is at greencalculus.com/standards.
A formal CITATION.cff file is included so GitHub renders a "Cite this repository" button in the sidebar.
- Authored by Jeremiah Say, Lead Systems Architect, GreenCalculus
- Verified by GreenCalculus Engineering — all standard mappings are reviewed against the official source documents before publication and on every material amendment
- Corrections welcomed via GitHub Issues or email to
jeremiah@greencalculus.com. All accepted corrections are credited in the next changelog entry on greencalculus.com/changelog. - Changelog — material amendments to standard mappings are recorded at CHANGELOG.md (created with first amendment) and mirrored to the live changelog.
Content in this repository is licensed under Creative Commons Attribution 4.0 International (CC-BY-4.0).
You may share and adapt the material for any purpose, including commercially, provided you give appropriate credit, link to the licence, and indicate if changes were made.
The full GreenCalculus calculator platform is available at greencalculus.com.