How to measure your plastic footprint

Why plastic footprint measurement matters

Plastic footprint measurement is no longer a voluntary best practice — it is becoming a regulatory requirement. The EU's Corporate Sustainability Reporting Directive (CSRD), with phased application from financial year 2024 onward, requires in-scope companies to disclose material impacts on resource use under the European Sustainability Reporting Standards, specifically ESRS E5 on resource use and circular economy. Extended Producer Responsibility (EPR) regulations in France (AGEC Law), Germany (Verpackungsgesetz), India (Plastic Waste Management Rules), and a growing list of markets impose financial obligations tied directly to the tonnage of plastic placed on the market. Measurement is the prerequisite for any defensible compliance, reduction, or offset strategy.

Defining the three scopes of plastic

Borrowing the Scope 1/2/3 framework from greenhouse gas accounting provides a practical structure, though no single international standard has yet formally codified these terms for plastic:

• Scope 1 — Direct plastic use: Resins, films, and packaging materials that your organisation manufactures, fills, or directly applies in its own operations. For a consumer goods manufacturer, this includes primary packaging applied on production lines. For a retailer with own-brand products, it includes packaging specified and procured directly to specification.
• Scope 2 — Purchased packaging as a service: Packaging provided by suppliers as an integral part of purchased goods, where your organisation has contractual influence over specification. The boundary is organisation-dependent and typically requires structured supplier engagement to quantify.
• Scope 3 — Upstream and downstream: The largest and most complex category. Upstream Scope 3 includes plastic embedded in raw materials, components, and indirect packaging. Downstream Scope 3 encompasses consumer-use packaging in which your products are sold, and the end-of-life fate of that material — whether it is recycled, landfilled, incinerated, or leaks into the environment.

Most organisations find that downstream Scope 3 accounts for 70 to 90 percent of their total plastic footprint, yet it is the most commonly excluded category in early-stage assessments, creating material gaps in reported figures.

Measurement methodologies

Three primary approaches exist, each appropriate for different data availability contexts:

• Bill of Materials (BoM) approach: The most accurate method for manufacturers. Every product's packaging specification is inventoried by material type, weight, and polymer grade. This requires data from procurement, product development, and packaging engineering teams, but yields a high-fidelity baseline suitable for EPR reporting and third-party verification.
• Material Flow Analysis (MFA): Used at sector or company level to trace plastic flows through the value chain, from resin production through end-of-life. MFA draws on production statistics, sales volumes, and waste management data to construct a mass balance. It is well-suited to portfolio-level analysis and benchmarking.
• Spend-based estimation: For organisations without bill of materials data, spend-based methods apply published plastic intensity coefficients to procurement expenditure categories. This is the least accurate approach but enables rapid, order-of-magnitude footprinting, and is an acceptable starting point for Scope 3 estimation pending more granular data collection.

Hotspot identification

Once a baseline inventory is constructed, hotspot analysis identifies which product lines, geographies, or packaging formats contribute disproportionately to the total footprint and, critically, to environmental risk. Key hotspot variables include:

• Polymer type: PVC and expanded polystyrene have limited recyclability relative to HDPE or PET; multi-layer laminates are virtually unrecyclable at scale in most markets.
• Packaging format: Sachets, films, and caps are frequently not collected in kerbside recycling streams even where infrastructure nominally exists.
• End-market geography: Plastics sold in countries with collection rates below 20 percent are at high risk of environmental leakage. The Plastic Waste Makers Index (Minderoo Foundation) provides country-level mismanaged waste data useful for geographic hotspot weighting.

Hotspot identification directs reduction investment to where it generates the greatest environmental impact per euro spent, and supports the prioritisation narrative required under CSRD's materiality assessment process.

Tools and software

Several platforms support plastic footprint quantification. PlasticIQ, developed with input from the Plastic Pollution Coalition and partner organisations, provides a guided corporate footprinting framework accessible to non-specialists. Ecochain and SimaPro are Life Cycle Assessment (LCA) platforms capable of modelling plastic-specific environmental flows using the ecoinvent database, enabling cradle-to-grave analysis aligned with ISO 14040/44. The Plastic Footprint Network, supported by WWF and partners, publishes sector-specific methodological guidance for food and beverage, apparel, and retail sectors. For Scope 3 estimation, the WBCSD Plastic Protocol provides a calculation workbook designed for chemical and materials companies.

Setting a baseline and reduction targets

A baseline year should be selected based on data quality and representativeness — typically the most recent complete financial year with reliable procurement records. Targets should be stated as absolute reductions (total kilograms eliminated) rather than intensity-based metrics (per unit of revenue) where EPR compliance or science-aligned framing is required. The Science Based Targets Network (SBTN) is developing plastic-specific target methodologies under its Materials sector workstream. Ahead of formal publication, many organisations are adopting the Ellen MacArthur Foundation's New Plastics Economy Global Commitment targets: elimination of problematic plastic formats, 100% reusable, recyclable, or compostable packaging, and increased recycled content percentages.

Reporting frameworks

Disclosure should be calibrated to the frameworks most material to your stakeholder audiences. GRI 301: Materials requires disclosure of total material weight by renewable and non-renewable category, with plastics typically reported as a sub-category. The CDP Supply Chain module includes plastic-specific questions for suppliers in relevant sectors. The Plastic Disclosure Project (PDP), now integrated into CDP reporting cycles, provides the most plastic-specific template, covering footprint, reduction actions, and governance arrangements. Under CSRD, ESRS E5 mandates disclosure of resource inflows and outflows and waste management, with plastics likely to be a material topic for any consumer-facing organisation operating at scale.

Common mistakes to avoid

• Excluding Scope 3: Reporting only operational or direct plastics while omitting downstream consumer packaging materially understates the footprint and is increasingly identified by investors and advocacy organisations as selective disclosure.
• Conflating weight with environmental impact: A kilogram of PVC film in an unmanaged waste stream is orders of magnitude more damaging than a kilogram of recycled HDPE. Weight-based metrics must be supplemented with recyclability ratings and end-of-life context.
• Using supplier-declared data without validation: Declared packaging weights frequently differ from actual weights by 10 to 30 percent. Physical verification through product sampling improves accuracy significantly.
• Treating the baseline as a one-time exercise: Product portfolios evolve, suppliers change, and EPR fee schedules are updated annually. Remeasurement each year is necessary for meaningful target-tracking and regulatory compliance.