In Word, you can select one of several units of measurement for the ruler. You may be working on a document for someone who measures their margins, tabs, etc. in a different set of units than you usually use. It’s easy to change.
Click the “File” tab.
Click “Options” in the menu list on the left.
The Word Options dialog box displays. Click “Advanced” in the menu list on the left side of the dialog box.
Scroll down to the Display section. Select an option from the “Show measurements in units of” drop-down list.
The units of measurement on the ruler changes to your selection.
If your ruler is not displaying, click the “View” tab and check the “Ruler” box in the Show group.
You can easily access the Word Options dialog box again and change the ruler to use different units as needed.