About “Calculated Properties”
Explains the concept of calculated properties in the context of property sets.
In addition to the option of reading and displaying existing parameters in the properties of an element, you can use your own formula expressions to calculate values in real time and display them when a corresponding element is selected.
All calculated properties behave like conventional properties, but are read-only - the calculated values cannot be changed in the LINEAR Properties dialog.
The formulas are evaluated via the Revit engine, so the formula syntax must correspond to the Revit specifications. Parameters must be referenced in curly brackets. The engine calculates the results with the maximum available precision, but the results are displayed taking into account the settings for decimal places under . Calculated properties cannot be referenced in other formulas.