# How do I calculate Scope 3 Category 1 emissions with Senseible?

Canonical: https://senseible.earth/answers/scope-3-category-1-spend-based

The GHG Protocol ranks Category 1 methods from supplier-specific and hybrid to average-data and spend-based. Senseible uses suppliers’ own bills where they exist and marks spend-based lines clearly, so you can see how much of the figure is evidence.

The supplier evidence check shows how many of your suppliers are backed by bills today and the pace needed to close the gap.

- [Scope 3 supplier evidence check](https://senseible.earth/scope-3-supplier-evidence)