> For the complete documentation index, see [llms.txt](https://www.bilancarbone-conformite.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://www.bilancarbone-conformite.com/compliance-framework/compliance-referentials/chapitre-a-cadre-technique-et-methodologique/critere-a.1-regles-de-calcul.md).

# Criterion A.1 - Calculation rules

The Bilan Carbone® method is primarily a method for assessing greenhouse gas emissions. Defining common calculation rules that are respected by all is essential to the reliability of the method.

#### Basic Calculation Principle

The most important rule lies in the application of the general principle presented in the following equation:

#### Pedagogy on Calculation

In order to enable understanding of the calculation principles used in carbon accounting, it is important to explain the concepts of GWP100, emission factors and activity data.

This notably allows novice users to understand how different greenhouse gases are taken into account, as well as the levers for action and improvement that carbon accounting can help identify.

#### Criterion

<table data-header-hidden><thead><tr><th width="132"></th><th></th></tr></thead><tbody><tr><td><mark style="color:red;"><strong>Mandatory</strong></mark></td><td><strong>Criterion A.1 - Calculation Rules</strong></td></tr><tr><td><strong>Question</strong></td><td>Is the candidate tool based on the principle of using emission factors (greenhouse gas emissions = emission factor x business quantity) and on the use of Global Warming Potential (100 years) for direct emissions?</td></tr><tr><td><strong>Answer</strong></td><td><ul><li><mark style="color:green;"><strong>Yes, the tool is based on the principle of using EFs and GWP100, and ensures the associated pedagogy</strong></mark></li><li><mark style="color:green;"><strong>Yes, the tool is indeed based on the principle of using EFs and GWP100</strong></mark></li><li><mark style="color:red;"><strong>No</strong></mark></li></ul></td></tr><tr><td><strong>Implementation Guidance</strong></td><td><p>Check whether:</p><ul><li>the emission factors used are those from recognised sources (ADEME, Ecoinvent, INIES, etc.) that use GWP100.</li><li>The concepts of GWP100, emission factors and activity data are explained.</li></ul></td></tr></tbody></table>


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