How to Calculate the Area in AutoCAD - ??

select the object and you will find the area in properties window under geometry tab  or use list command

1- write command "Area" and select object

2- Use Properties panel of the selected objected

3- Use "List" command and select object

4- Use lisp for complecated reqierments

Type area

Select the area with mouse click

and then press enter

click cad menu bar and select deminsion to click after check to  the object.

I agree with Nader Ali"s answer

GO TO TOOLS MENU, THEN SCROLL DOWN TO INQUIRY PANE AND CLICK ON AREA.

Use command 'AA'. follow the steps on command bar.

You can add or substrat areas also