The first step in calculating the amount of paint required is to calculate the surface area or for epoxy floor coating to be painted. This area may be the wall, or the ceiling, or the door of the room.
Calculating the square footage of wall work is relatively easy and the only hard part is that you have to be very careful and do not miss any surface. You need a meter, pencil and notebook to calculate the color area of the building.
Try to draw a general picture of the room map in the notebook. You can map each room separately. Mark the location of windows and doors completely on the image. Then measure the width and height of each wall in feet and write on the map.
Then measure the length and width of all the doors and windows (and any other parts that should not be painted) and note these measurements as well. Finally, you need to subtract the area of these parts from the total area of the wall, because these parts either do not paint or need a different color.
For example, doors are painted with special wood and primer paint, the glass parts of the windows are not painted naturally, and the color of the window frames is different from the color of the walls. In this section, it is better to note the material of metal and wooden items on the picture and specify so that you do not get confused when buying different types of paints.