Setting your Units of Measure in Fusion 360 is really easy.
When you first install the software, you will see a pop up in the bottom right hand corner of the screen, asking you to choose your preference for “Default Units” as well as “CAD Experience”
To change the units later on, simply go to to “Preferences“. Click on your user name in the top right hand corner, then click on the drop-down arrow and select “Preferences“.
In the “Preferences” Dialogue box, click on “Units and Value Display“, you can select your chosen units.