Calculation Methodology

Understanding our approach to carbon emissions calculation

When calculating emissions: details matter

Increasingly corporations are required by law to report their emissions to regulators. In practice, this means they need to use credible calculation logic – most commonly by following the Greenhouse Gas Protocol standards – and provide auditable data sources to back up calculation results.

As one example, the EU's CSRD regulation, which affects many corporations reporting starting in 2025, requires companies to receive limited and then reasonable assurance from 3rd party auditors for their emissions reports (source).

The pressure to produce audit-grade reports has only increased. Corporations who reduce their reported emissions over time increasingly receive financial benefits in various forms.

Some examples of the financial impact of reducing emissions:

  1. Avoiding painful fines:
    • The ECB has threatened daily fines up to 5% of annual revenue for banks who are not compliant with regulations to report emissions from their loan portfolios (source)
  2. Reducing the cost of carbon taxes:
    • The EU's cap and trade ETS scheme expanded in 2024, and now covers emissions from maritime shipping (source)
      • This is already incentivizing large regulated enterprises to find lower carbon solutions to reduce their tax bill – for example, Nestle is now working with Maersk to reduce its shipping emissions using alternative fuels (source)
    • The UK and California have similar cap-and-trade policies in place
  3. Retaining and winning enterprise buyers:
    • Enterprises like Salesforce.com have committed to reducing their emissions by signing up to the Science Based Targets Initiative, and now increasingly require suppliers to contractually commit to doing the same. Such internal policies can have a cascading effect within entire supplier ecosystems (source)

The good news is that increasing accuracy enables reductions

The GHG Protocol sets out three levels of data granularity, and provides guidance that companies use the most granular data available and accurate for their situation:

  1. Primary data at the product/service level reported by a supplier
  2. Primary data reported at the company-level
  3. Secondary average emission factors

Most carbon accounting software use EEIO emission factors compiled by environmental researchers out of the box. While this is an acceptable method by the GHG Protocol standard, and a reasonable starting point in a decarbonization journey, in practice many of these EFs are several years old and unhelpfully broad. This means they are less accurate and often overestimate emissions compared to more current and granular emissions data.

In addition to being less accurate, companies that use these emission factors to estimate their scope 3 emissions don't get credit when their Scope 3 counterparties reduce their emissions. This means the only way to reduce your Scope 3 procurement emissions in the short term is to reduce your procurement spend – not exactly actionable advice!

On the other hand, if product or company-level emissions data are available, companies can increase their reporting accuracy while getting credit for reduction actions taken by their Scope 3 counterparties.

Greenhouse Gas ProtocolSBTargets Logo

Why don't all companies use primary data?

If using more granular primary data instead of average emission factors increases the accuracy of a report and can help reduce a company's reported emissions, why doesn't every company do it?

Companies increasingly publish primary emissions data, but these reports are complicated to acquire and use. This is because most managers don't know how to translate unstandardized emissions reports into useful data and actions, and suppliers hate responding to surveys.

How DitchCarbon simplifies the Scope 3 Challenge

We start by taking the pain out of acquiring company-reported carbon data, by aggregating data from many fragmented sources, and normalizing it to Greenhouse Gas Protocol standards.

We then provide tools that automate Scope 3 measurement and simplify carbon reduction decisions for both sustainability professionals and supply chain operations employees.

Depending on your use case and available input data, DitchCarbon can provide manufacturer-reported data and solutions at the product or company level, as well as industry average EEIO emission factors when more granular data are not available, to complete coverage.

In practice, this means our products are:

  1. Auditable: with original data sources provided
  2. Accurate: aligned with the GHG Protocol
  3. Comprehensive: automatically delivering the broadest coverage while using the most granular primary data when available and appropriate for your use case

We handle common issues with Scope 3 data so you don't have to, and our team is available to help you pick the best tool for your use case.

Detailing our methodology

Organization level data

Inputs

  • Company name
  • HQ country
  • Website
  • Industry
  • Stock Ticker
  • Spend (if using web app)

Outputs

  • Organization-level emission factor
  • DitchCarbon score
  • Current and historical disclosures
  • SBTI, CDP, and UNGC status
  • Reduction Action Co-Pilot
  • Peer comparisons
  • Industry benchmark
  • Sources for all data points

Product level data

Inputs

  • Product name
  • Product manufacturer
  • Location of use
  • Quantity
  • Price (used as fallback)

Outputs

  • Product carbon footprint (if disclosed)
  • Breakdown of stages of use
  • Method of calculation used
  • Organization-level spend or category-level spend (if not disclosed)
  • Sources of all data points