to change the ruler unit of measure, follow these steps:
Step one: Click on the "File" button.
Step two: Click "Options" in the menu list on the left.
Step three: On the left side of the Word Options dialog box that pops up, click the "Advanced" tab.
Step four: Scroll down to the show section. Select an option from the unit of Measure Drop-down list.
Step five: Depending on your selection ruler unit of measurement is changed.
Step Six: If your ruler is not displayed, click the "View" tab and check "ruler" in the "show" group.
Step Seven: You can easily open the Word Options dialog box again and change the ruler to the different units you want.