You can easily change the scale from Standard (Imperial) to Metric or vice versa without redoing any part of your drawing.
Choose Units & Scale from the Page tab.
You can also find Units & Scale in your SmartPanel if you started with a floor plan, landscape design or other CAD type drawing template.
Select your desired scale from the drop-down menu. Choose from common Architectural, Metric, or Mechanical Engineering options.
Selecting Custom allows you to choose a customized scale (and customized rulers) from the Set Rulers and Grids dialog. Click OK once the scale (and ruler position) has been determined.
Learn more about the options in this dialog.