The total surface or paint area of plates can be displayed in BOM lists. The surface value takes into account any contour feature, chamfer or fillet which is present on the plate.
In this example, a simple model is used.
Create a 1sq meter or feet plate. Copy the plate a couple of times and on the copied plates place features (rectangular, circle, polygonal contours, chamfers or fillets).
The "Surface of piece" field content must use the "Global Paint" or "Paint" token.
The surface column will display the exact total surface of each plate (every side is taken into account, even the 4 sides of the plate that represent the thickness).