How Room Volume is Computed

In project templates, volume computation is turned on by default. If it affects performance, you can turn it off. Then turn on volume computation only when you want to prepare and print schedules or other views that report room volumes. See Enabling Volume Computations.

When it computes room volumes, Revit LT does the following:

• Determines the room area. See Determining the Area of a Room.
  Note: Room volumes are computed to the wall finish, regardless of the Room Area Computation setting.
• Determines the room height. See Defining Room Height and Considering Ceilings and Floors in Room Volume Computations.
• Uses the room area and the room height to compute the room volume.