Open AutoCAD and create a new drawing or open an existing one.

Unit Settings of AutoCAD

Type “UNITS” in the command line and press Enter. Alternatively, you can access the units settings by clicking on the “Application” button (the big red ‘A’ in the top-left corner), then going to “Drawing Utilities” > “Units.”
The “Drawing Units” dialog box will appear, providing several options for length, angle, area, and other unit settings.
Under “Length,” choose the desired unit from the drop-down menu. For example, you can select inches, feet, millimeters, centimeters, meters, etc.
Optionally, you can also set the “Angle” units if you need to work with angles in your drawing.
Verify and adjust other settings like “Area” and “Volume” units if required.
Once you have selected the appropriate units, click the “OK” button to apply the changes and close the dialog box.