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Enclosure Volume Calculators - Subwoofer Box Calculator

Calculators created by Andrew Vaserfirer
Images created by NEO Dan
Accurate calculation of enclosure volume for your subwoofer box is essential in designing a properly functioning subwoofer. These calculators will calculate the volume for square, rectangular, triangular, trapezoidal and cylinder tube subwoofer enclosures, sealed or ported, including driver volume, bracing volume and port volume displacement. These calculators will operate with both fractions (1/4, 1/2, 3/4, etc.) and decimals (.25, .50, .75 etc.). Be sure to read the instructions for each calculator. You can ask for help and ask questions in the DIY Subwoofer forum.


Square or Rectangular Volume Enclosure Calculator
For a square or rectangular subwoofer enclosure, the calculation for net volume is (width x height x depth) using internal measurements. Enter your desired box dimensions and material thickness if measuring outside dimensions. Next enter any bracing and port displacement volume if ported. If sealed leave the port volume field empty. You can calculate bracing and port volume by using the appropriate bracing and port volume calculators below. Finally, enter the number of drivers and driver volume. The manufacturer will generally furnish the driver volume. The total net volume will be output in both liters and cubic feet. You may wish to scroll down and calculate the bracing and/or port volume first and then come back to this calculator.

Example of how to measure a square or rectangular enclosure box...

This calculator is for square or rectangular enclosures.
Box Width    Inches
Box Height    Inches
Box Depth    Inches
If using outer dimensions you will need to input material thickness below.
Material Thickness    Inches
Bracing Volume    Inches3
Port Volume    Inches3
Driver Volume    Ft3
Number of Drivers    Total
Total Net Volume    Ft3
Total Net Volume    Liters
 
 
Triangular or Trapezoidal Enclosure Volume Calculator
This calculator will calculate the total net internal volume of a triangular or trapezoidal subwoofer enclosure. Enter your desired box dimensions and material thickness if measuring outside dimensions. For trapezoidal enclosures you will need to enter both depth measurements (Depth 1 and Depth 2). For triangular enclosures you will leave the Depth 2 field empty. Next enter any bracing and port displacement volume if ported. If sealed leave the port volume field empty. You can calculate bracing and port volume by using the appropriate bracing and port volume calculators below. Finally, enter the number of drivers and driver volume. The manufacturer will generally furnish the driver volume. The total net volume will be output in both liters and cubic feet. You may wish to scroll down and calculate the bracing and/or port volume first and then come back to this calculator.

Example of how to measure a triangular or trapezoidal enclosure...

This calculator is for triangular or trapezoidal enclosures.
Width    Inches
Height    Inches
Depth 1    Inches
Depth 2    Inches
If dimensions used are outer dimensions you will need to input material thickness below.
Material Thickness    Inches
Bracing Volume    Inches3
Port Volume    Inches3
Driver Volume    Ft3
Number of Drivers    Total
Total Net Volume    Ft3
Total Net Volume    Liters
 
 
Cylinder Tube Enclosure Volume Calculator
For a cylinder tube subwoofer enclosure (sonotube or concrete tube type enclosures) the calculation for net enclosure volume is (pi x height x [diameter/2]2) using internal measurements. Enter your desired cylinder tube dimensions and material thickness if measuring outside dimensions. Next enter any bracing and port displacement volume if ported. If sealed leave the port volume field empty. You can calculate bracing and port volume by using the bracing and port volume calculator below. Finally, enter the number of drivers and driver volume. The manufacturer will generally furnish the driver volume. The total net volume will be output in both liters and cubic feet. You may wish to scroll down and calculate the bracing and/or port volume first and then come back to this calculator.

Example of how to measure a cylinder tube enclosure...

This calculator is for cylinder tube enclosures.
Cylinder Height    Inches
Cylinder Diameter    Inches
If using outer dimensions you will need to input material thickness below.
Material Thickness    Inches
Bracing Volume    Inches3
Port Volume    Inches3
Driver Volume    Ft3
Number of Drivers    Total
Total Net Volume    Ft3
Total Net Volume    Liters
 
 
Bracing Calculator with Optional Square or Rectangular Cutouts
(Use for Square or Rectangular Enclosures)
This application will help you calculate the bracing in square or rectangular enclosures with optional square or rectangular cutouts of the same size. The formula for this is (width x height x thickness) less the total volume of all cutouts. Once you have calculated the volume of your bracing, write down these figures so that you can input them in the appropriate enclosure calculator above that will be used to determine your total net volume.

Example of how to measure square or rectangular bracing with equal size square or rectangular cutouts...

This calculator is for square or rectangular bracing with optional square or rectangular cutouts.
Brace Width    Inches
Brace Height    Inches
Brace Thickness    Inches
Cutout Width    Inches
Cutout Height    Inches
Number of Cutouts    Total
Total Brace Volume    Inches3
 
 
Bracing Calculator with Optional Round Cutouts
(Use for Square or Rectangular Enclosures)
This application will help you calculate square or rectangular bracing with optional round cutouts of the same size. The formula for this is (width x height x thickness) less the total volume of all cutouts. Once you have calculated the volume of your bracing, write down these figures so that you can input them in the appropriate enclosure calculator above that will be used to determine your total net volume.

Example of how to measure square or rectangular bracing with equal size round cutouts...

This calculator is for square or rectangular braces with round cutouts.
Brace Width    Inches
Brace Height    Inches
Brace Thickness    Inches
Cutout Diameter    Inches
Number of Cutouts    Total
Total Brace Volume    Inches3
 
 
Bracing Calculator with Optional Round Cutouts
(Use for Cylinder Tube Enclosures)
This application will help you calculate cylinder tube bracing with optional round cutouts of the same size. The formula for this is (pi x height x [diameter/2]2) less the total volume of all cutouts. Once you have calculated the volume of your bracing, write down these figures so that you can input them in the appropriate enclosure calculator that will be used to determine your total net volume.

Example of how to measure cylinder tube bracing with equal size round cutouts...

This calculator is for round bracing with round cutouts.
Brace Thickness    Inches
Brace Diameter    Inches
Cutout Diameter    Inches
Number of Cutouts    Total
Total Brace Volume    Inches3
 
 
Simple Bracing and Cutout Calculators
If you have bracing with multiple size bracing and cutouts, then this simple bracing and cutout calculator will help you determine the bracing volume to input in the appropriate enclosure calculator above. First, use the calculator to determine your overall brace volume with no cutouts. Write down the volume. Clear the entries for bracing and input the first cutout dimensions. Subtract it from your overall bracing volume that you previously calculated. Repeat these steps until you have subtracted all of your various sized cutouts from your overall bracing. If you have round cutouts, use the round cutout calculator to calculate all of your round cutouts that will need to also be subtracted from your overall brace volume. Repeat all of the above steps for multiple bracing pieces until you have calculated all of your bracing volume for your enclosure.

Example of how to measure bracing with multiple size cutouts...

This calculator is for simple square or rectangular bracing and cutouts.
Brace or Cutout Width    Inches
Brace or Cutout Height    Inches
Material Thickness    Inches
Total Net Volume    Inches3


This calculator is for simple round bracing and cutouts.
Bracing or Cutout Diameter    Inches
Material Thickness    Inches
Total Net Volume    Inches3
 
 
Port Volume Calculator for Slotted Ports
This calculator will help you determine the slotted port volume used with square or rectangular enclosures. If you are using a cylinder tube port (sonotube, concrete tube or PVC pipe) scroll down and use the Cylinder Tube Port Calculator. The formula for this calculator is (width x height x depth or length of port). The key to measuring slotted ports is to be sure to measure the outside dimensions of the part of the port that is inside the enclosure, however do not include the enclosure walls if any are used for port walls. Always start from the inside wall of the enclosure. Once you have calculated the volume of your port, write down the figure so that you can input it in the appropriate enclosure calculator that you will use to determine your total net volume.

Example of how to measure square or rectangular slotted ports...

This calculator is for square or rectangular slot ported enclosures. Remember to use outer dimensions.
Port Width    Inches
Port Height    Inches
Port Depth    Inches
Total Port Volume    Inches3
 
 
Port Volume Calculator for Cylinder Tubes
This application is used for calculating the volume of cylinder tube ports (sonotube, concrete tube or PVC pipe). The formula for this is (pi x length x [diameter/2]2). The key to measuring tube ports is to be sure to measure the outside dimensions of the part of the port that is inside the enclosure. Always start from the inside wall of the enclosure and measure to the end of the port. Once you have calculated the volume of your ports, write down the figure so that you can input it in the appropriate enclosure calculator that will be used to determine your Total Net Volume.

Example of how to measure cylinder tube ports...

This calculator is for calculating the volume of cylinder tube ports.
Cylinder Length    Inches
Cylinder Diameter    Inches
Total Port Volume    Inches3
 
 
Cubic Volume Converter
Enter one of either cubic inches, cubic feet or liters and the calculator will convert the input to the other values.


This calculator will convert cubic inches, cubic feet or liters for the two unknown values.
Cubic Inches      Inches3
Cubic Feet      Ft3
Liters      L
 
 




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