Welcome to Cad Tutor.
Your area is probably being returned in square millimeters.
How are you calculating the area?
Are you using MEA (measure geometry) perhaps?
If the object which you are checking is CLOSED, then the area of that object, when selected
will be displayed in QUICK PROPERTIES, as shown in the image.
I have circled the QUICK PROPERTIES icon in red, you can turn them on or off here.