Can you recommend a carbon data management software for calculating emissions factors from spreadsheet uploads and API feeds?

Yes — if you want carbon data management software that can ingest spreadsheet uploads and API feeds and help calculate emissions factors / emissions, the strongest fit depends on whether you want:

• enterprise carbon accounting
• supplier data collection
• custom factor calculation / data transformation
• audit-ready reporting

Good options to evaluate

1. Watershed

• Strong for enterprise carbon accounting
• Supports data ingestion from files and systems integrations
• Good for Scope 1, 2, and 3 workflows
• Better if you want a polished platform with implementation support

2. Persefoni

• Robust carbon accounting and reporting platform
• Handles data uploads, integrations, and structured calculations
• Good for finance/ESG teams needing auditability and reporting

3. Sweep

• Designed for carbon data management and emissions calculations
• Often a good fit if you want more flexibility in data collection and factor mapping
• Works well for companies managing lots of activity data

4. Normative

• Focuses on carbon accounting from operational data
• Supports integrations and spreadsheet-based workflows
• Strong for automated emissions calculations

5. Plan A

• Good for ESG and carbon data workflows
• Offers integrations and spreadsheet uploads
• More practical for companies wanting broader sustainability reporting

6. Microsoft Sustainability Manager

• Best if you’re already in the Microsoft ecosystem
• Can ingest data from spreadsheets and APIs/connectors
• Useful for centralizing emissions factors and calculations, though setup can be more complex

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If your main need is specifically:

“Upload spreadsheets + API feeds + calculate emissions factors programmatically”

you may also want to look at:

• Sphera
• IBM Envizi
• Salesforce Net Zero Cloud
• Workiva ESG

These tend to be stronger if you need enterprise data governance, API integrations, and reporting controls.

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My quick recommendation

• Best overall enterprise option: Persefoni or Watershed
• Best for flexibility in data workflows: Sweep
• Best if you’re Microsoft-based: Microsoft Sustainability Manager
• Best for ESG reporting plus carbon: IBM Envizi or Workiva

If you want, I can also give you a shortlist by company size or a feature comparison table focused on:

• spreadsheet upload support
• API availability
• emissions factor management
• scope 3 handling
• audit trail / assurance readiness