When supplied with a value for /LINES, /CALC will calculate the
    font size so that your output will fill the page less the top and
    bottom margins. /CALCULATE will only make the font size large (or
    small) enough to fit the number of lines you specified onto the
    page. It will not check to see whether the horizontal length of
    your lines will fit within the left and right margins.

    This command must be used with the /LINES qualifier and cannot be
    used with the /SIZE qualifier.