These boxes are the easiest to calculate the internal volume. If the box has internal measurements of 6 high18 wide12 deep then the volume of the box is 1296172875 ft3. Calculate for Box Enclosure Tuning Frequency.
You simply measure the height width and depth in inches multiply them together and then divide that number by 1728.
Calculate Enclosure Volume or for Box. Select an enclosure type choose a unit of measure and wood thickness then input your dimensions. The Woofer BoxWizard will calculate how much internal air space is available for your woofer s. Enter value select unit and click on calculate.