When you create a part or assembly, the units of measurement in the template sets the default units of measurement for the model. You can change the default units for the active document.
- Click Tools tab Options panel Document Settings to open the dialog box.
- Click the Units tab to open it.
- To change the setting for any of the measurement types or precision, click the arrow next to the edit box. Select the setting from the list.
- When you have finished the desired changes, click Apply to save them.