Units > Formatting the Unit Display
  
Formatting the Unit Display
To format the unit display of your worksheet, on the Math tab, in the Units group, configure the following options:
Unit System—Selects the unit system for the worksheet:
SI—International System
USCS—United States Customary System
CGS—Centimeter-Gram-Sec
Base Units—Displays the units as a set of base units or compound units.
With Base Units
Without Base Units