how to change units in solidworks?

If you're using Solidworks 2012 then there's an even quicker option. In the lower right hand corner is a pull up menu that lists the units currently selected. Opening that menu will bring up all the available options.

  1. Step 1:

    The menu is listed a "Custom" right now.

  2. Step 2:

    Click the arrow next to Custom to get the menu to pop up. Then select the desired unit system.