By default, Word takes the unit of measure settings from the system's regional settings. Sometimes, however, there is a need to use, even temporarily, other units. Fortunately, changing these settings in Word is very easy.
Click File tab in top-left corner
Click Options tab at the bottom-left corner
Go to Advanced tab
Scroll down to Display section.
There is an option which we are looking for: Show measurements in units of.
You can choose: Inches, Centimeters, Milimeters, Points, Picas.
Confirm settings by clicking OK button.