ProcessEnergy and Materials
Product carbon footprint calculation for materials producers, from plant data to customer exchange
Product carbon footprint calculation for a material means quantifying the greenhouse gas emissions attributable to one declared unit of it, usually from raw material extraction to your factory gate, under rules your customers will accept. For materials producers that means ISO 14067, the PACT Methodology and often a sector guideline. This page sets out a five-step process, the standards that shape each step, the plant data it depends on and how to exchange the result with customers.
On this page
- Why buyers now ask for a footprint per kilogram, not your annual emissions
- The PCF pipeline from boundary definition to a customer's system
- Five steps to a footprint your customers can rely on
- Which standard governs which part of a materials PCF
- Plant and business data to locate before the first calculation
- Automating the PCF pipeline without losing the audit trail
- Questions and answers
- Sources
Why buyers now ask for a footprint per kilogram, not your annual emissions
A customer building its own Scope 3 inventory, or its own product footprint, needs emissions per unit of what it buys from you. Your corporate inventory, totaled across sites and products for a year, cannot answer that. The PACT Methodology states the link directly: companies should fold supplier PCFs into their Scope 3 footprints by multiplying them by the units purchased2. Our guide to calculating Scope 3 emissions covers the buyer's side of that exchange.
Regulation adds pressure in some sectors. The EU Battery Regulation requires a carbon footprint declaration for electric vehicle batteries, light means of transport batteries and rechargeable industrial batteries above 2 kWh5, and the EU carbon border adjustment mechanism requires importers to declare embedded emissions for goods such as iron and steel, aluminum, cement, fertilizers, hydrogen and electricity6. Each has its own method, so a PCF built for customers does not automatically satisfy them, but the same plant data feeds all three.
The PCF pipeline from boundary definition to a customer's system
- Declared unit and boundary
What is being footprinted, per what unit, and which processes are inside the gate.
- Plant and supplier data
Metered energy, materials, waste and transport, plus supplier footprints where available.
- Allocation
Splitting shared process emissions between products and co-products.
- Calculate and review
Apply emission factors, check data quality and state uncertainty.
- Verification
Independent check of the calculation model and, where required, the result.
- Exchange and update
Share in a standard format and recalculate when production changes.
Five steps to a footprint your customers can rely on
Define the declared unit and the cradle-to-gate boundary
Intermediate materials have many possible end uses, so they are footprinted per declared unit, such as a kilogram, rather than per function. PACT accepts a fixed list of declared units, including kilogram, liter, cubic meter, kilowatt hour and megajoule, and sets a cradle-to-gate boundary that excludes the product's use and end of life2. Name which sites, process steps and product grades are covered, and how packaging is treated.
Collect primary data from plant systems and fill gaps transparently
Pull activity data from metering, the historian, ERP bills of materials and purchasing, laboratory records, waste manifests and logistics systems. PACT expects activity data to be company-specific, allows secondary emission factors that meet its safeguards, and asks companies to report a primary data share; data quality ratings become required from 20272. Record the source and quality of every input as you go, not at the end.
Allocate emissions between co-products and treat recycled inputs consistently
Where one process makes several products, avoid allocation by subdividing the process if you can; otherwise follow the PACT allocation hierarchy, which applies the ISO 14067 and GHG Protocol options of physical, economic or other justified relationships in a defined order2. Classify outputs as co-product or waste using the methodology's decision tree. For recycled inputs, PACT uses the cut-off approach2. Write down why each choice was made.
Calculate, review and verify, stating uncertainty
Apply emission factors, including electricity emissions calculated on a life-cycle basis and contractual instruments only where they meet the methodology's quality criteria2. Excluded processes must together stay below 3 % of the cradle-to-gate total2. PACT calls for independent third-party verification, starting with the PCF calculation model used to produce footprints2. Run sensitivity checks on the inputs that drive the result.
Exchange PCFs with customers and set an update rule
Share each footprint with the minimum data elements PACT specifies, using solutions that follow the PACT Technical Specifications for the data model and exchange API4. Agree when you will recalculate: after process, energy or supplier changes large enough to move the result, and at a regular interval otherwise.
Which standard governs which part of a materials PCF
| Document | What it is | What it contributes | When you need it |
|---|---|---|---|
| ISO 14067:2018 | International standard for quantifying the carbon footprint of products | Principles and requirements aligned with life cycle assessment, covering climate change only1 | Almost always, as the base method customers and verifiers recognize |
| GHG Protocol Product Standard | The Product Life Cycle Accounting and Reporting Standard3 | Life-cycle accounting and reporting rules consistent with corporate GHG inventories | When customers report under GHG Protocol and want product data to match |
| PACT Methodology | WBCSD guidance for calculating and exchanging cradle-to-gate PCFs2 | Specific choices: declared units, allocation order, data quality metrics, verification path | When customers request PACT-conformant footprints or use the PACT network |
| TfS PCF Guideline | Together for Sustainability's footprint guideline for the chemical industry7 | Sector rules for chemical materials | For chemicals and chemical intermediates sold into chemical value chains |
| PACT Technical Specifications | Data model and exchange API for PCFs4 | A machine-readable way to share footprints | When footprints move between systems rather than by spreadsheet |
These documents layer rather than compete: a sector guideline refines the general method, and the technical specifications carry its results. Check current versions before starting.
Plant and business data to locate before the first calculation
Automating the PCF pipeline without losing the audit trail
The first footprint is usually built by hand. The second product, and the quarterly update, show why automation matters: the same meter, ERP and supplier data must be pulled, checked and recombined each time. ColdAI's energy and materials practice describes carbon footprint calculation and emissions reporting with audit-ready documentation as part of its carbon tracking work8.
An automated pipeline should keep a versioned record of every input, emission factor, allocation rule and calculation run, so a verifier or customer can trace any number back to its source. Where several parties must trust the same records, tamper-evident logs help; our pages on Hedera's sustainability tooling and energy certificates cover how that works for environmental data.
Questions and answers
How is a product carbon footprint different from a life cycle assessment?
A full life cycle assessment covers many environmental impact categories, such as water use and acidification. A product carbon footprint under ISO 14067 addresses only climate change, using life cycle assessment methods. For intermediate materials the footprint is usually partial, ending at the factory gate, because the producer cannot know every downstream use. Customers add their own stages.
What if our suppliers cannot provide product footprints?
Use secondary emission factors from a reputable database for those inputs, record that they are secondary, and let the primary data share and data quality metrics show it. Then rank suppliers by their contribution to your footprint and ask the largest first. Over successive updates, replacing secondary factors with supplier data improves both accuracy and the credibility of your footprint.
Can guarantees of origin or renewable certificates lower a product footprint?
Under PACT they can, but only if the contractual instruments meet the methodology's quality criteria, and electricity emissions are calculated on a life-cycle basis. Document the certificates, their volumes and the period they cover against the production period of the product. Customers and verifiers will check that the claim matches your actual supply, so keep the evidence with the footprint.
How often should a materials PCF be recalculated?
Recalculate when something material changes, such as a new energy contract, process modification, major supplier switch or product reformulation, and otherwise at a regular interval agreed with customers. PACT sets conditions under which earlier footprints must be recalculated. An automated pipeline makes frequent updates practical, because the data pull and checks no longer depend on manual collection.
Sources
- ISO 14067:2018 Greenhouse gases — Carbon footprint of products — Requirements and guidelines for quantification — ISO · checked 10 October 2026
- PACT Methodology, Version 3.0 — WBCSD Partnership for Carbon Transparency · checked 10 October 2026
- Product Life Cycle Accounting and Reporting Standard — Greenhouse Gas Protocol · checked 10 October 2026
- PACT Technical Specifications for PCF data exchange — WBCSD Partnership for Carbon Transparency · checked 10 October 2026
- Regulation (EU) 2023/1542 concerning batteries and waste batteries — EUR-Lex · checked 10 October 2026
- Regulation (EU) 2023/956 establishing a carbon border adjustment mechanism — EUR-Lex · checked 10 October 2026
- The Product Carbon Footprint Guideline for the Chemical Industry — Together for Sustainability · checked 10 October 2026
- Energy and Materials: use cases and delivery process — ColdAI