Simplified GHG Emissions Calculator

The Simplified GHG Emissions Calculator is a free tool that helps organizations estimate and inventory their annual greenhouse gas (GHG) emissions. It calculates scopes 1, 2, and 3 emissions based on an organization’s activity data for one annual period.

Intended Audience

The calculator is intended for organizations interested in developing a GHG inventory. While it can be used by organizations of all sizes, it is primarily intended for small- to medium-sized organizations who are in the early stages of GHG management.

Steps in Completing a GHG Inventory

1. DEFINE: The first step in completing a GHG inventory is to determine the boundaries and emissions sources included within those boundaries. After you have defined your organizational and operational boundaries, you can use the questions on the "Determine Emissions Sources" webpage to help you determine which emissions sources are relevant to your organization.
2. COLLECT: The second step is to collect data for the defined annual period. This step is typically the most time consuming, since the data can be difficult to gather. The calculator has help content with suggestions and guidance for each emissions source.
3. QUANTIFY: The third step is to calculate emissions. The calculator is designed to complete the emissions quantification step for you.

Use the Calculator

Download Excel Edition

Notes on Excel Version:

The Excel Version uses the XLOOKUP function that is only supported by the following versions of Excel. It is recommended to update Excel to the latest version if an error is encountered during use.

• Excel 2021 or later (PC and Mac)
• Excel for Microsoft 365 Subscriptions (PC and Mac Versions)
• Excel Online

Macros: The Excel Version uses macros for navigation within the tool using the buttons and are safe to employ. To use the calculator, please ensure that macros are enabled:

• Windows: Navigate to the “Trust Center” in the “Options” menu, then select Trust Center Settings > Macro Settings > Enable VBA macros.
• Mac OS: Select “Enable macros” in the dialog box that appears when opening the file.

Users may also need to unblock macros to use the calculator by right clicking on the file and checking “Unblock” at the bottom of the General tab. For further information, please see the Microsoft support link for enabling/disabling macros.

Calculator Resources

View the Calculator Resources page for a list of resources to help organizations develop a GHG Inventory, use the Simplified GHG Emissions Calculator, and take the next steps in GHG emissions management.