You can define calculations from the values of displayed fields and show the result in a virtual column, using the Compute feature.
Give the new column a name in the Column Heading field and a display format in the Format Mask field. Define the formula using the columns, keypad, and functions (see Compute Functions). The formula is shown in the Computation Expression field. Click Apply to apply the computation to the page.
To edit the computation, click the column header to open a dialog box.