Show the ruler
To see the rulers, choose View and select the Ruler check box.
If you don't see the vertical ruler, go to the File tab, choose Options > Advanced, and under Display, select the Show vertical ruler in Print Layout view check box.
Show the rulers
On the View tab, select the Ruler check box.
If the vertical ruler doesn't show, make sure you're in Print Layout view. If it still doesn't show, you might need to turn the ruler on. On the Word menu click Preferences > View (under Authoring and Proofing Tools). Then, in the View dialog box, select the Vertical ruler box.
Change the unit of measure
You can change the unit of measurement displayed on the rulers, to do this:
On the Word menu, click Preferences > General (under Authoring and Proofing Tools).
In Show measurement in units of, select the unit of measurement you want to use.
You can’t show rulers in Word Online unfortunately. But if you have the Word desktop application, click Open in Word to open the document and see rulers.