Library
Standards, Methodology, Data & Definitions
The reference layer behind every number — the frameworks we follow, how each calculation is built, the datasets you can cite, and plain-English definitions.
Free · every source cited · versioned with the factors
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Glossary
Plain-English definitions, each with the formula and the sources behind it.
Browse the glossaryTopics
Browse by subject — pick a theme and see every calculator, standard and guide on it.
Explore topicsGuides
Practical, step-by-step walk-throughs of the trickiest parts of carbon accounting.
Browse guidesReference & data
Standards
The frameworks behind every number — GHG Protocol, IPCC, ISO, PCAF and disclosure rules.
Browse standardsMethodology
How each calculator is built — factor by factor, assumption by assumption.
Read the methodologyData
Download the underlying emission-factor datasets, each with a DOI you can cite.
Browse datasetsThe engine behind every number
MasterBrain
One versioned, cited library of emission factors that powers every calculator, tool and converter. Update a factor once — every page that uses it updates with it.
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The other half
The Library is the reference layer. When you’re ready to put a number on something, head to Resources — 143 calculators, quick tools and converters, all built on exactly these sources.