An ISO 14064 carbon footprint inventory is the technical foundation underneath almost every GCC ESG mandate now landing on businesses’ desks — the reporting frameworks tell you what to disclose, ISO 14064 tells you how to actually measure it credibly. If you’ve never built a GHG inventory before, the terminology alone can be a barrier. Here is the beginner’s version, without skipping the parts that matter.
ISO 14064 CARBON FOOTPRINT BASICS — WHAT THE STANDARD ACTUALLY COVERS
ISO 14064 isn’t a single document — it’s a three-part series. The ISO 14064-1:2018 standard covers organisation-level quantification and reporting — this is the part almost every business starts with. ISO 14064-2:2019 covers project-level GHG reduction quantification (relevant if you’re running a specific carbon reduction project, not just reporting your overall footprint). ISO 14064-3:2019 covers validation and verification — the independent third-party check that your numbers are credible.
For a first carbon footprint, you’re working almost entirely within Part 1.
HOW ISO 14064-1 DIFFERS FROM THE GHG PROTOCOL
Most people have heard of the GHG Protocol Corporate Standard before they’ve heard of ISO 14064. The two are closely aligned and largely compatible — ISO 14064-1 was developed alongside the GHG Protocol and shares its foundational principles. The practical difference: the GHG Protocol is a widely adopted reporting framework, while ISO 14064-1 is a certifiable international standard with a formal verification pathway built in under Part 3. If a regulator or customer specifically requires third-party verified GHG data, ISO 14064 is usually the standard behind that requirement, even when the underlying accounting looks similar to GHG Protocol methodology.
SCOPE 1, 2, 3 — AND WHAT ISO 14064-1 CALLS THEM INSTEAD
Most people learn GHG accounting through the familiar Scope 1 (direct emissions), Scope 2 (purchased energy), and Scope 3 (everything else in the value chain) framework. ISO 14064-1’s 2018 revision technically organises emissions into six categories rather than three scopes — but the six categories map closely onto the same underlying concepts, and most practitioners still talk about the inventory using Scope 1/2/3 language day to day. For a beginner, understanding the three-scope version is enough to get started; the six-category structure becomes relevant once you’re actually building the formal inventory documentation.
STEP 1 — DEFINE YOUR ORGANISATIONAL BOUNDARY
Before you measure anything, decide which parts of the business the inventory covers — wholly owned operations only, or joint ventures and leased facilities too. This decision, made using either an equity share or control approach, determines everything that follows.
STEP 2 — IDENTIFY YOUR EMISSION SOURCES
List every source of emissions within your boundary: fuel combustion, company vehicles, purchased electricity, and — for a complete picture — value chain emissions like business travel, employee commuting, and purchased goods and services.
STEP 3 — COLLECT ACTIVITY DATA
For each source, gather the underlying activity data — litres of fuel burned, kilowatt-hours of electricity purchased, kilometres travelled. This is usually the most time-consuming step for a first inventory, since the data often lives across multiple departments and systems that have never been asked for it before.
STEP 4 — APPLY EMISSION FACTORS
Convert activity data into GHG emissions using recognised emission factors — standard conversion values published by government bodies or international databases that translate “100 litres of diesel” into a tonnes-of-CO2-equivalent figure.
STEP 5 — CALCULATE AND DOCUMENT YOUR INVENTORY
Total the emissions across all sources and categories, and document the methodology, data sources, and any assumptions made. This documentation is what a verifier will actually review under Part 3 — an inventory without a clear methodology trail is very difficult to verify.
STEP 6 — CONSIDER VERIFICATION
Verification isn’t mandatory for every use case, but it’s increasingly expected — by regulators tightening GCC ESG mandates, by customers doing supply chain due diligence, and by voluntary carbon markets. A verified inventory carries materially more weight than a self-reported one.
WHY THIS MATTERS RIGHT NOW FOR GCC BUSINESSES
Our ESG reporting framework GCC guide covers the regulatory mandates now tightening across every GCC exchange — and nearly all of them require a credible GHG inventory as the underlying data. If your business is also working toward the UAE’s climate targets, our Net Zero UAE 2050 guide covers the wider strategic picture this inventory feeds into. And if you’re ISO 50001 certified, much of your energy consumption data is already sitting in your energy management system — see our ISO 50001 energy management guide for how that overlaps directly with Scope 1 and 2 data collection.
WHERE THIS CONNECTS TO YOUR EXISTING EMS
If you’re already certified to ISO 14001, your environmental management system likely already tracks much of the activity data a carbon inventory needs. Our ISO 14001:2026 transition guide covers the environmental data foundation this builds on.
NOT READY TO BUILD THIS ALONE?
A first GHG inventory has a learning curve, and getting the boundary and methodology right the first time saves significant rework later. Visit our shop for consulting support if you’d rather have an experienced team build your first inventory with you than learn by trial and error.