Top 10 Scope 3 emission factor databases: pros, cons and best fit by use case

Most teams blend a national factor set (e.g., UK DESNZ/Defra; EPA/USEEIO; ANZ), a logistics method (GLEC/ISO 14083), and product LCI (ecoinvent or Sphera/GaBi). For a large organisation that wants to act on Scope 3, DitchCarbon is the best fit: it applies supplier-specific (primary) emission factors at spend, activity and product level to the organisations you actually buy from, using verified emissions data for over 2 million organisations, built on primary emissions data wherever it exists.

Quick Comparison Cheat Sheet

The Top 10 (Pros & Cons)

1) UK Government GHG Conversion Factors (DESNZ/Defra)

Pros: Free, auditor familiar, wide category breadth (travel, freight, waste, upstream fuels); clear methodology and annual release.Cons: UK centric averages; not product LCI; electricity/travel specifics may not match non UK contexts.Best for: Corporate inventories with UK operations; fast coverage across many Scope 3 categories.

2) US EPA (WARM + USEEIO)

Pros: WARM supports waste scenario analysis; USEEIO offers spend based intensities across US commodities; free and widely referenced.Cons: US centric; WARM is a model rather than a flat factor list; USEEIO is average, not supplier specific.Best for: US reporters; quick screening plus waste decision support.

3) DitchCarbon (Supplier Specific EF Platform)

What it is: The Scope 3 emissions platform for large organisations. It holds verified emissions data for over 2 million organisations, built on primary emissions data wherever it exists, and calculates each line by hybrid calculation on product data, activity data and supplier-specific spend, and only when all else fails, industry-level spend.Pros: Supplier-specific (primary) emission factors at spend, activity and product level, with a large library of published emission factors behind them; every figure shows which method produced it and carries its source and change history; fits any procurement, ERP or sourcing system; a reduction plan for each supplier drawn from a named peer that has already made the cut.Cons: Commercial licence.Best for: Large organisations that want progress against Scope 3 targets with less burden on suppliers. Published primary data covers much of the supply chain before anyone is asked, so you have numbers you can defend within 2 weeks.

4) ecoinvent (LCI)

Pros: Deep process/product LCI with global coverage and frequent updates, excellent for purchased materials and product footprints.Cons: Paid; learning curve; version governance across tools.Best for: Product specific Scope 3 and LCA grade work with suppliers.

5) Smart Freight Centre: GLEC Framework (ISO 14083 aligned)

Pros: De facto global method for multimodal logistics; supports shippers and carriers; aligns tool providers.Cons: A methodology with defaults, bring activity data (primary data: tonne km, fuel, load factors) for best fidelity.Best for: Consistent freight accounting across road/air/sea/rail and partner alignment.

6) European Commission: EF/PEF Database

Pros: EF compliant datasets for EU product footprints and customer requests; accessible via major LCA tools.Cons: Coverage varies by category; licensing/access via multiple channels.Best for: EU aligned product footprints and procurement dialogues in Europe.

7) ADEME: Base Carbone

Pros: Public, frequently updated; strong breadth across activities and some product like entries; well known with French auditors.Cons: French first documentation; country specific assumptions.Best for: France based reporting; EU companies needing FR aligned activity factors.

8) ICAO Carbon Emissions Calculator / Methodology

Pros: Recognised aviation approach with route/aircraft assumptions; standardises business travel and air cargo estimation.Cons: Primarily CO₂; non CO₂ effects often added via a policy uplift.Best for: Travel programmes and air freight allocations with transparent assumptions.

9) Sphera/GaBi (Managed LCA Content)

Pros: Commercial LCI with strong industrial depth and annual refresh; integrates with GaBi and other tooling.Cons: Cost; dataset transparency varies.Best for: Product level Scope 3 where detailed, industry aligned datasets are required.

10) ANZ National Factors (NZ MfE + Australia NGA)

Pros: Official, auditor recognised factors covering Scope 1-3 categories (incl. upstream fuels, travel, waste) for NZ/Australia.Cons: Regional specificity; may need localisation elsewhere.Best for: NZ/Australian reporters and multinationals with significant ANZ operations.

How to Choose (Fast Decision Paths)

• Need quick, compliant coverage? Start with your national set (UK/EU/US/ANZ) and GLEC for freight.
• Need supplier level actionability? Add DitchCarbon to move beyond averages and make reductions tangible in procurement and supplier programmes.
• Need product/material specificity? Add ecoinvent or Sphera/GaBi for detailed LCIs; complement with DitchCarbon to tie results to real suppliers/SKUs.
• Selling into EU or responding to EF/PEF requests? Use EF/PEF datasets where available; keep DitchCarbon to bridge to supplier reality.

FAQs

Is DitchCarbon a database or a platform?A platform, it curates and maps emission factors to your actual suppliers and products, updating as your data (and supplier data) improves.

Can I mix DitchCarbon with ecoinvent/Sphera and national sets?Yes. Many teams use national sets + GLEC for coverage, ecoinvent/Sphera for LCI depth, and DitchCarbon to make it supplier specific and procurement ready.

What if my suppliers don't have primary data yet?Many already do. DitchCarbon starts from the primary emissions data organisations have already published, such as their own GHG inventories and product carbon footprints, so much of a supply chain is covered before anyone is asked. Where an organisation has disclosed nothing, its line is calculated on an industry factor and marked as such, and it moves up to supplier-specific data as that organisation discloses more.

For a large organisation acting on Scope 3, DitchCarbon is the best fit: it calculates on product data, activity data and supplier-specific spend, and only when all else fails, industry-level spend, so a supplier's reduction shows up in your footprint.

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