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Speaker Box Calculator
A speaker enclosure is matched to the driver, not chosen by size, so the box volume follows from the driver's Vas and Qts together with the alignment you want. Ported boxes add a tuned port whose length must be calculated to hit the target frequency.
How it works
Enclosure type
Vas (equivalent volume)
Qts
Target Qtc (sealed)
Tuning frequency
Port diameter
Number of ports
Driver diameter
Enclosure volume
Enclosure volume
Port length
Port length
Estimated -3 dB point
Enclosure type
Port air speed
Frequently asked questions
How do I use the Speaker Box Calculator?
Fill in the fields above โ the result recalculates instantly as you type. Everything runs in your browser, so the values you enter are never collected or stored.
Is this calculator free?
Yes. It is completely free, requires no account, and works on phones, tablets and desktops.