The calculator below calculates the volume of construction materials, like concrete or bricks, which is needed for perimeter walls of a rectangular building. It uses length, width and height of a building, plus thickness of the walls.
Calculation is rather trivial.
First, you multiply outer dimensions of a building: length by width by height, which gives you outer volume of a building "box".
Second, you calculate inner space of a building, multiplying length minus two thickness by width minus two thickness by height.
The walls volume is the difference between outer volume of a building and inner space of a building. If you need to take into account doorways and window openings you can use Total volume calculator
Note that you should use the same units of length in all form fields below, whether meters, feet or inches. Do not mix meters and centimeters or feet and inches.