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# Calculate Length of Vent or Port

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### App description

Subwoofer vent length calculation

Calculation of vent length, volume of box, tuning frequency, and end correction factor

Select the appropriate unit and enter a value and click on "Calculate". The result will be displayed.

### Calculation formula

L = Length of Vent or Port

D = Diameter of Vent

N = Number of Ports

V = Volume of Box

F = Tuning Frequency

K = End Correction Factor

$$L=\frac {2.35625×10^4×D^2×N}{V×F^2}-K×D$$

### Usage example

Known data: diameter of vent; number of ports; volume of box; tuning frequency; end correction factor, what is the vent length?

Input data: diameter of vent--10 cm; number of ports--10; volume of box--5 liters; tuning frequency--5 Hz; end correction factor--5, click "Calculate" to display the result.

Output: vent length: 1.8845×105cm

### Note

The unit of diameter of vent, box volume, tuning frequency and vent length can be selected. Click on the selected head to select the corresponding unit.