The traceable reference layer for corporate carbon accounting.
Every emission factor traces to a named standard, version-stamped and publicly logged. Audit-grade calculators for Scope 1, 2, and 3 — aligned with the GHG Protocol Corporate Standard, IPCC AR6, and the 2026 GHG Protocol Land Sector & Removals Standard. Built for sustainability officers, lifecycle engineers, and corporate auditors.
Tools you run, references you cite.
Get a carbon number, fast
Full models, single-purpose quick tools, and instant unit converters — every result traces to a versioned factor.
Explore all resourcesThe sourced layer behind every number
The standards we encode, the math we show openly, plus the vocabulary and datasets behind it — all citable to MasterBrain.
Enter the libraryEvery number on this site carries a receipt.
GreenCalculus Engineering
Verification pipeline
Source-to-cell traceability of source workbooks, cell-by-cell provenance on every emission factor, and prose-vs-data cross-validation. Runs on every update before publication.
How verification worksPublic changelog
Append-only audit trail
Every change to a calculator, dataset, or methodology is dated, scoped, and version-stamped. Append-only by design — corrections never overwrite history.
View the changelogJeremiah Say
Lead Systems Architect
Builds the calculation engines and methodology documentation directly from GHG Protocol, IPCC AR6, and DEFRA source documents. Spotted an error? Corrections welcomed and credited in the public audit trail.
Read full bioRecently verified.
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Use a GreenCalculus number in your report?
Cite it. Every calculator and methodology page exposes the live MasterBrain version stamp at the bottom — copy it into one of the formats below for CDP, SECR, CSRD/ESRS, or any audit-grade disclosure.
ISO 690
GREEN CALCULUS, 2026. {Calculator or methodology title}. MasterBrain v{version} [online]. [Accessed {day month year}]. Available from: {URL}
APA 7
GreenCalculus. (2026). {Calculator or methodology title} (MasterBrain v{version}) [Reference data]. Retrieved {Month day, year}, from {URL}
Vancouver
GreenCalculus. {Calculator or methodology title} [Internet]. MasterBrain v{version}. 2026 [cited {year month day}]. Available from: {URL}
Each calculator output page exposes the live MasterBrain v{version}
stamp at the bottom of the result. Full citation guidance and corrections policy:
Data Governance & Editorial Standards →