> For the complete documentation index, see [llms.txt](https://help.auxalia.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.auxalia.com/plant-tools/plantexpresstools/how-to-use/calculations/update-calculations.md).

# Update Calculations

If calculations are configured the calculations can be updated either through the ribbon...

![](https://2994090777-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FZH2AGHzvPfBW7YdaaGc0%2Fuploads%2Fgit-blob-c6108a1ff74e6abfcc7d37ad4ee5cb3a76dbfc93%2FCalculations-60.png?alt=media)

... or the calculations will be updated when the drawing is saved. For this the checkbox under "Calculations Update" must be check under the settings [On Drawing Save](/plant-tools/plantexpresstools/settings/on-drawing-save.md).

In the following chapters we will see the following examples:

1. The property "MeasuringType" will be calculated by getting the first character of the property "Type" ([Calculate simple Example](/plant-tools/plantexpresstools/how-to-use/calculations/calculate-simple-example.md)).
2. The color of the "GeneralInstrumentSymbols" will be changed to red if the Tag contains a "?" ([Calculate AutoCAD Properties)](/plant-tools/plantexpresstools/how-to-use/calculations/calculate-autocad-properties.md).
3. The line annotation will be calculated to show in a flexible way the values of the properties "InsultationType" and "InsulationThickness" ([Calculate Annotations)](/plant-tools/plantexpresstools/how-to-use/calculations/calculate-annotations.md).
4. The Operational Flow Speed and Size will be calculated based on Design Flow Speed and Flow Rate, This example will also include PlantLink ([Calculate FlowData (complex) with PlantLink)](/plant-tools/plantexpresstools/how-to-use/calculations/calculate-flowdata-complex-with-plantlink.md).

![](https://2994090777-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FZH2AGHzvPfBW7YdaaGc0%2Fuploads%2Fgit-blob-c05c9e6cb4f4585e873f812964fc5ccb27a9eb60%2FCalculations-59.png?alt=media)