From virtually any dialog entry line in the program, the ? command will go to the Calculator routines and allow copying and pasting of any selected calculation result back into the dialog entry line.
For example, if you were grading a site that had 19.5” of subgrade, and had modeled the top surface, you need to grade to the top surface with a vertical offset of -19.5/12. You could quickly obtain the value in feet by entering ? in the Vertical Offset field within the Elevation Difference dialog, as shown in this next figure.
This leads immediately to the Calculator dialog, with its four tabs, or options, many with sub-options. Using the Standard tab, we can enter 19.5/12 and get 1.625 as shown. Then select the Copy button, which places the value in the banner line at the very top of the screen. Then choose Paste in the upper right to paste the value back into the Vertical Offset dialog edit box. These calculations can also be done directly from the edit box within the Vertical Offset dialog. You could enter "19.5 in" for inches, which would auto-convert to feet or the current units setting. In this same edit box, you could also enter 19.5/12, which would do the division directly in the edit box. This figure shows the Calculator screen.