Set default units of measure

1. Click the ribbon Tools tab Options panel Document Settings.
2. In the dialog box, click the Units tab.
3. 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.
4. Click Apply to save changes.

Note: To override the default units of measure, enter the unit name after the value. For example, 0.05 in. or 3 mm.