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🌐 Scope 3 Calculator — Value-Chain GHG Inventory

Estimate all 15 GHG Protocol Scope 3 categories — spend-based or activity-based — to get your total value-chain footprint, each category as a % of the total, the SBTi 40% materiality flag, and a CSRD/ESRS E1-ready inventory you can export to Word or CSV.

Footprint context

Enter your reporting year and your Scope 1 + Scope 2 total (in tCO₂e). It is used to express Scope 3 as a share of your total footprint and to apply the SBTi 40% materiality rule.

The 15 Scope 3 categories

For each material category choose a method, then enter spend (in your currency, ’000 or full — be consistent) and a spend factor (kgCO₂e per currency unit), or an activity quantity and an activity factor. Leave non-material categories at zero. Override any default with your own EPA/DEFRA/ADEME/supplier value and cite it.

CategoryMethodQuantity / SpendFactor (kgCO₂e/unit)tCO₂e%

Upstream vs downstream

Top Scope 3 categories

Educational estimate only — NOT legal, tax, financial, accounting, audit or assurance advice. Spend-based factors carry high uncertainty; results are order-of-magnitude screening figures. A CSRD/ESRS or SBTi-grade inventory must follow the GHG Protocol Corporate Value Chain (Scope 3) Standard with documented data quality and, where required, third-party assurance. Consult a qualified GHG/sustainability professional.