The Convert Tab dialog is split in half with the Input settings on the left side and the Output settings on the right side.
Using the drop down boxes, select the column name that relates to the appropriate data type. The Calculator will label the text box according to which coordinate systems have been set in the Point Database Conversions tab.
For example, if the user is converting geodetic points (Lat/Long), the text boxes will indicate ‘Latitude’ and ‘Longitude’. For grid (UTM, State Plane, etc) the labels will indicate “North/South” and “East/West” where appropriate. This is true for both the Input and Output sides of the dialog.