Calculating Speaker Enclosure Volume

Square or Rectangular Enclosures:
These boxes are the easiest to calculate the internal volume. You simply measure the height, width and depth (in inches), multiply them together and then divide that number by 1728. If the box has internal measurements of 6" high*18" wide*12" deep then the volume of the box is 1296/1728=.75 ft^3. The diagram below shows how you would measure the dimensions of the box.
Rectangular speaker box


If you want to compensate for the volume taken up by the woofer, you can use the following approximations:

8 inch .03 ft3
10 inch .05 ft3
12 inch .07 ft3
15 inch .10 ft3

Use this calculator to determine whether your speaker is best suited for use in a sealed or ported enclosure.
Speaker's Resonant Frequency (fs)? Hertz
Qes?

EBP =

If you are using internal measurements, make sure the wood thickness is set to '0' (zero).

This is for rectangular sealed enclosures.
Height? = Inches
Width? = Inches
Depth? = Inches
If the above dimensions are OUTSIDE dimensions, enter the thickness of the wood below.
Wood Thickness = Inches
 
Total box volume = Ft3



Triangular boxes:
The first type of triangular box has a right angle which will make the calculations a little easier. For a right triangle, you simply multiply the height by the depth by 1/2 of the base. The diagram shows the height and depth (base). The length is the dimension not shown on the diagram. You can see why you use 1/2 of the base by looking at the diagonally bisected rectangle and how it relates to the triangle.
Right triangle box

Don't drag your mouse right here, your gonna scratch my perty little box!
This is for sealed triangular enclosures.
Height? = Inches
Width? = Inches
Depth1? = Inches
Depth2? = Inches
If the above dimensions are OUTSIDE dimensions, enter the thickness of the wood below.
Wood Thickness = Inches
 
Total box volume = Ft3