A customer has asked for the carbon footprint of a specific product — the part or material you sell them, not the company. That is a Product Carbon Footprint, and it is now a standard supplier request. Before calculating, confirm the boundary the customer wants and the unit they want it per.
| First question | Short answer |
|---|---|
| How does it differ from my company footprint? | A PCF is the emissions of one product per unit (per part, per kilogram). The company footprint is total annual emissions. |
| Which boundary? | Usually cradle-to-gate for a component or material supplier: raw material extraction to your factory gate. Confirm with the customer. |
| Where does the data come from? | Bills of materials, production energy, supplier PCFs or database factors, inbound transport. |
| Which methodology? | GHG Protocol Product Standard, ISO 14067, or PACT-aligned. Follow the one the customer specifies. |
| What makes it credible? | The documented method: boundary, data sources, factors, allocation, period. |
Links checked 14 July 2026.
Company footprint versus product footprint
The company carbon footprint is total emissions across operations in a year. A Product Carbon Footprint is narrower: the greenhouse gas emissions associated with one product, expressed as kg CO₂e per unit.
The customer is buying a specific product and needs its emissions to calculate the carbon of their product that contains it. Your PCF is an input to their footprint — Scope 3 for them — so the figure has to be about the product, not the business.
Why customers ask
- Scope 3 pressure. Large customers are pushed by targets, investors, and regulation to measure and cut value chain emissions. Purchased goods are usually their largest Scope 3 category.
- Product-level regulation and disclosure. Sector rules increasingly reference product-level carbon; EU importers collecting data for CBAM need embedded-emissions figures from suppliers.
- Procurement decisions. Some buyers compare suppliers partly on product carbon. A credible PCF is a commercial advantage.
Boundaries
The most important decision is the system boundary: how much of the product's life is counted.
- Cradle-to-gate — raw material extraction through to your factory gate. The most commonly requested boundary for a component or material supplier, because the customer adds downstream stages.
- Cradle-to-grave — the full life cycle including use and end of life. Usually for finished consumer products.
Confirm the boundary with the customer before starting. A cradle-to-grave calculation when cradle-to-gate was needed produces a number they cannot use.
Calculating a PCF
- Define the product and the unit. Which product; per unit, per kg, per m².
- Confirm the boundary with the customer.
- Map the inputs.
- Raw materials — quantities of each material and their emission factors (embodied carbon of steel, plastic, aluminum, and so on)
- Production energy — electricity and fuel used to make it; a share of site energy allocated to this product
- Purchased components — emissions of bought-in parts, ideally the suppliers' own PCFs, otherwise database factors
- Inbound transport and packaging, where in scope
- Allocate shared emissions. If the site makes several products, split site-level energy and overheads by mass, production time, or another defensible method. Document the choice.
- Apply emission factors to each input for kg CO₂e; sum. The carbon calculator handles energy and fuel conversions; the manufacturing carbon footprint guide covers the operational side.
- Document the method. Boundary, data sources, factors, allocation approach, reporting period. A PCF without its method is a number; with it, it is evidence.
Recognized methodologies — the GHG Protocol Product Standard, ISO 14067, and PACT-aligned approaches — set out the rules in detail. A first useful figure does not require mastering them. If the customer specifies one, follow it.
Where the data lives
- Bills of materials — material quantities
- Utility bills and meter data — production energy
- Supplier data — PCFs or emission factors for bought-in components and materials
- Emission-factor databases — for materials without supplier-specific data
- Transport records — inbound logistics
What not to do
- Do not send a company footprint for a product footprint. Total annual emissions do not answer a per-unit request.
- Do not invent factors or hide assumptions. Where a database factor stands in for supplier data, say so. Data quality transparency is part of a credible PCF.
- Do not treat unmeasured inputs as zero. Use a documented proxy and flag it.
- Do not over-engineer the first one. A transparent, reasonable cradle-to-gate estimate with documented assumptions beats a perfect one that never ships. Refine as data improves.
The bottom line
A Product Carbon Footprint is a product's emissions per unit, usually cradle-to-gate, and a standard request because customers need it for their own Scope 3 and product disclosures. Confirm the boundary, map materials and production energy, allocate shared emissions, apply factors, document the method. One product done properly repeats across the range.
Official References
- GHG Protocol Product Life Cycle Standard
- ISO 14067 — carbon footprint of products
- PACT — Partnership for Carbon Transparency