Hi SkyZen,
If I understood you correctly, you mean the purchase value of inventory stock (stock * purchase price) or perhaps the sale value of inventory stock (stock * regular price).
In both cases we do not perform that calculation, but with the help of our add-on ATUM export-pro, you could export the information you need in a CSV, XML, or JSON file, and with your favorite spreadsheet program, and with the exported data calculate the information you need.
Best regards.
Juan Antonio.