The Material Take-Off can be found on the Results toolbar after solution.
It will show a summary of the all the elements in your RISAFoundation model including slabs, beams, footings, pile caps, pedestals, and retaining walls. The program will find the number of elements, the total volume and self-weight of concrete. The weight of the concrete is based Density listed on the Materials spreadsheet. Below shows an example of the Material Take-Off spreadsheet.