> For the complete documentation index, see [llms.txt](https://docs.tryterra.co/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.tryterra.co/faq/help-topics/data-api-sdk/data-model-fields-and-units/visceral-fat-level-units.md).

# Is visceral\_fat\_level a percentage?

`visceral_fat_level` is the **raw numeric index passed through from the scale device**. It is not a percentage and there is no formula to derive one.

Its scale is provider-specific (for example Withings roughly 0-20, Omron 1-30), so the same number means different things across providers.

For a comparable value, **use `visceral_fat_category`**, which Terra normalises into `NORMAL` / `HIGH` / `VERY_HIGH` using each provider's published thresholds.


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