> For the complete documentation index, see [llms.txt](https://www.bilancarbone-methode.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-methode.com/english/4-accounting/4.4-methode-destimation-des-incertitudes.md).

# 4.4 - Uncertainty estimation method

<figure><img src="/files/NagGdJ5r6ShesobxhoVr" alt="" width="563"><figcaption><p>Source: Freepik</p></figcaption></figure>

This sub-section details what uncertainty is, [why](/english/4-accounting/4.4-methode-destimation-des-incertitudes/4.4.1-pourquoi-des-incertitudes.md) it is an integral part of the Bilan Carbone® method, and [how](/english/4-accounting/4.4-methode-destimation-des-incertitudes/4.4.2-comment-les-determiner.md) to estimate it, whether qualitatively or quantitatively:

* [4.4.1 - Why uncertainties?](/english/4-accounting/4.4-methode-destimation-des-incertitudes/4.4.1-pourquoi-des-incertitudes.md)
* [4.4.2 - How to determine them?](/english/4-accounting/4.4-methode-destimation-des-incertitudes/4.4.2-comment-les-determiner.md)

{% hint style="info" %}
As a reminder, the emissions from each emission source of the organisation are estimated as follows:

Emission from a source = [Activity data](/english/4-accounting/4.2-methode-de-collecte-des-donnees-dactivite.md) x [Emission factor](/english/4-accounting/4.3-methode-de-selection-des-facteurs-demission.md) = [Result](/english/4-accounting/4.5-profil-demission.md) ± [Uncertainty](/english/4-accounting/4.4-methode-destimation-des-incertitudes.md)
{% endhint %}

***

*Do you have a comprehension question?* [*Consult the FAQ*](/english/annexes/faq.md)*. The method is living and therefore subject to change (clarifications, additions): find the* [*change log here*](/english/readme/historique-et-suivi-des-modifications.md)*.*