Rooms are generally rectangular in shape, so the floor space is the length times the width. Add up all the rooms (and corridors or other spaces) and you get the total for the house. If you have spaces that are not rectangular, then the calculations become a bit more complicated, but you can usually estimate a rectangular equivalent.
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Total Surface Area = 6L2. Where L = the length of one side of the cube.
Total surface area of a cube: 6 times a side squared
To calculate the number of bricks needed for an area, first determine the total area to be covered by multiplying the length by the width of the surface. Next, calculate the area of a single brick, including any mortar space if applicable. Finally, divide the total area by the area of one brick to find the number of bricks required, and add a percentage for waste and breakage, typically around 10%.
By multiplying its length to its width. Area= length x width
Calculate the area of the room. Calculate the area of the window (or whatever opening) Room Area*100/Window Area