Scope 3 Explained for Real-World Decisions
Understand Scope 3 emissions, the 15 categories, calculation approaches, data quality, and what companies actually need to do next.
Start with the decision in front of you
A customer asked for carbon data
Decode the request before you start calculating or buying software.
You need supplier data
Learn what information to request, how to assess gaps, and how to avoid collecting everything at once.
NEW · 2026 GUIDE
Scope 3 Emissions Reporting
See how category screening, supplier data, calculation methods, evidence and reporting fit together — plus the 2026 GHG Protocol and EU context.
Core Scope 3 topics
- The 15 Scope 3 categories — what they cover and when they matter.
- Calculation methods — spend-based, activity-based and supplier-specific approaches.
- Data quality — primary versus secondary data, estimates and documentation.
- Materiality and prioritization — where to focus first instead of treating every category equally.
- Supplier engagement — how to improve value-chain data over time.
Score your current carbon-data readiness →
When Scope 3 reporting involves recurring supplier requests, multiple contributors or audit requirements, compare the carbon accounting software decision framework with your existing spreadsheet workflow before investing in a platform.