Can Solidworks calculate the volume of a model? I would need the volume
in order to convert it to weight of a metal. I would appreciate the procedure.
Check this tool, it should provide you with both volume and mass (if you added apropriate material to your model).
Assign material to the model and you'll get mass.
Tools>Options>FeatureManager set Sensors to "Show"
Then as you make changes you can see the changes to the weight volume right there in the feature tree while you make changes(just right click on the Sensors folder and add one for mass volume):
It depends on what you are trying to do as to whether the above is helpful.
Editted to show volume, as the OP asked.
..as suggested above... also, imho, what you can also do for reassurance is test/verify with some bar stock material (XYZ and weigh) you're using.
SOLIDWORKS Quick Tip - Calculating Volume
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