ISO 14064 vs GHG Protocol describes two compatible tools, not rivals: the GHG Protocol Corporate Standard is the widely used accounting method for calculating Scope 1, Scope 2 and Scope 3 emissions, while ISO 14064-1 is the international standard specifying how an organisational greenhouse gas inventory is designed, reported and independently verified.
Standard versus method
Confusion over ISO 14064 vs GHG Protocol usually dissolves once each is placed in its category. The GHG Protocol Corporate Standard is the widely used accounting method that defines how Scope 1, Scope 2 and Scope 3 emissions are categorised and calculated, and it is the more prescriptive of the two on calculation, particularly for Scope 3. ISO 14064-1 is the international standard specifying requirements for the design, development, management and reporting of an organisation level greenhouse gas inventory, setting formal requirements for consistency, documentation and verification while leaving exact calculation methods more open. ISO 14064 is published as a family, where ISO 14064-1 covers the organisational inventory, ISO 14064-2 addresses project level quantification, and ISO 14064-3 governs independent validation and verification. Structured carbon footprint consulting applies both together rather than choosing between them.
ISO 14064 vs GHG Protocol at a glance
| Aspect | GHG Protocol | ISO 14064 |
|---|---|---|
| Nature | Accounting method and framework | International standard (specification) |
| Focus | How Scope 1, 2 and 3 are categorised and calculated | Requirements for designing, managing and reporting an inventory |
| Prescription | More prescriptive on calculation, especially Scope 3 | Formal on consistency, documentation and verification |
| Verification | Optional; the route to assurance | ISO 14064-3 governs independent validation and verification |
Reported to one, verified by another
The two standards were drawn closer by the 2018 revision of ISO 14064-1, which expanded its indirect emission categories to map more closely onto the GHG Protocol scopes, so a well prepared inventory can satisfy both with little duplication. In common practice the order runs as follows:
- Calculate the inventory using GHG Protocol methodology across Scope 1, Scope 2 and Scope 3.
- Report and verify that inventory against ISO 14064-1.
- Seek independent assurance to ISO 14064-3, performed by a qualified body that did not prepare it.
Independent validation and verification of a greenhouse gas assertion is a separate step under ISO 14064-3, where a qualified third party checks the inventory against a recognised standard. Verification is optional under the GHG Protocol but is the route to third party assurance for organisations seeking public disclosure or certification, work carried out by accredited bodies rather than a consultant. The carbon footprint guide sets out the full sequence.
Sources: GHG Protocol Corporate Standard · ISO 14064-1 · ISO 14064-3