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Click Tools > Weight & CG to display the Weight & CG Ribbon.
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Click Select
on the ribbon.
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Select objects in a graphic view or in the Workspace Explorer.
To remove an object from the select set, click it again. To remove all objects, click
Clear Latest Selection 
on the ribbon.
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Click Accept Latest Selection
when you finish adding objects to the select set.
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Select a coordinate system for the center-of-gravity calculation in the Coordinate System box. You can choose any coordinate system in the workspace or define a new coordinate system by three points.
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Click Toggle Center of Gravity
to see the coordinate reference and center-of-gravity markers in the graphic view.
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Click Toggle List of Parts
to see a table of the parts in the select set with their corresponding weights and
centers-of-gravity.
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Select dry or wet weight from the Condition list.
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View the weight and coordinate data in the boxes in the ribbon.
If the Caution 
icon displays beside Weight or CG, this indicates that there are some parts that have invalid Weight or CG values. Otherwise, the Correct 
icon displays. Click Toggle List of Parts to see the items that have invalid Weight or CG. The Weight & CG Display List shows the list of parts that have invalid Weight or CG in yellow font.
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To end the command, click Close on the ribbon. Alternatively, click Tools > Weight & CG again.
The Weight & CG command remains active as you work in the model and can be toggled on and off.