> For the complete documentation index, see [llms.txt](https://docs.ladybug.tools/ladybug-primer/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.ladybug.tools/ladybug-primer/components/4_extra/to_si.md).

# To SI

![](https://894783789-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-LPHXQ1I3gb93zpLrLZf%2Fuploads%2Fgit-blob-f3dbddc62e19c4e390be3614dbb7e6af6888df20%2FTo_SI.png?alt=media)

![](https://894783789-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-LPHXQ1I3gb93zpLrLZf%2Fuploads%2Fgit-blob-7a5e471ad63d4d17bfa20938204eeed79021a570%2FTo_SI.png?alt=media) - [\[source code\]](https://github.com/ladybug-tools/ladybug-grasshopper/blob/master/ladybug_grasshopper/src//LB%20To%20SI.py)

Convert a DataCollection to SI values.

### Inputs

* **data\_ip \[Required]**

A DataCollection in IP (or other) units.

### Outputs

* **data\_si**

The DataCollection in SI units.