Ruler settings 

     The Ruler Settings command is used to change the units 
of measure on the rulers displayed along the left side (vertical ruler)
and at the top (horizontal ruler) of the document layout window. 
Different units can be displayed for the horizontal and vertical rulers. 
When Ruler Settings is selected from the Edit menu, a dialog box 
appears which allows you to set the individual ruler measures. The 
available units are: inches, picas, points, and centimeters.
    You can change ruler settings also by clicking on the rulers
intersection where the units currently in effect is displayed.