Scope 3 Purchased Goods Emissions Calculator

Estimate Scope 3 Category 1 emissions using the spend-based method. Input procurement spend, an emission factor in kg CO₂e per USD, and optional adjustments for inflation or supplier abatements to produce auditable greenhouse-gas totals.

Total invoiced value for purchased goods within the reporting boundary in USD.
Economy-wide or supplier-specific intensity aligned with the spend-based method.
Leave blank to assume no inflation adjustment. Use CPI or commodity-specific escalation to restate spend.
Leave blank to assume 0%. Enter the percentage of emissions reduced through supplier-specific data or certificates.

Carbon accounting helper; align the methodology with your assurance provider and the GHG Protocol before filing ESG disclosures.

Examples

  • Spend $750,000, emission factor 0.42 kg/USD, inflation 3%, reduction 10% ⇒ Adjusted spend $772,500.00, emissions 292,005.00 kg CO₂e (292.005 tCO₂e).
  • Spend $2,400,000, factor 0.35 kg/USD, leave adjustments blank ⇒ Emissions 840,000.00 kg CO₂e (840.000 tCO₂e).

FAQ

Can I use physical emission factors instead?

Yes. Convert unit-based activity data to spend-equivalent intensity (for example, USD per tonne) or adapt the formula to multiply physical quantities by kg CO₂e per unit.

How do supplier abatements work?

If suppliers provide primary data or low-carbon certificates, enter the percentage reduction to reflect the attributable abatement while keeping documentation for assurance.

Should abatements ever reach 100%?

Only claim 100% reductions when you possess activity-based evidence that residual emissions are truly zero; otherwise leave a margin to reflect remaining upstream impacts.

Additional Information

  • Result unit: kilograms and metric tonnes of CO₂e.
  • Emission factors should align with the spend-based method defined in the GHG Protocol.
  • Inflation uplift allows historic invoices to be restated to current-year dollars before applying factors.

Related calculators