By default, Revit does not compute room volumes.
When volume computation is turned off, room tags and schedules display Not Calculated for the Volume parameter. Because volume computation may affect Revit performance, turn it on only when you want to prepare and print schedules or other views that report volumes.
https://help.autodesk.com/view/RVT/2025/ENU/?guid=GUID-FA3F3769-F8C7-4C7F-8DB1-79EE6BFF8496
https://help.autodesk.com/view/RVT/2025/ENU/?guid=GUID-22B6D041-F6D8-4DB0-8094-B325CC3CC6B4
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Vitor Bortoncello | Arquiteto | BIM Manager
Autodesk Certified Professional