Speaker Design Calculators
Free speaker design calculators for enclosure volume, port length, slot ports, Thiele-Small alignment, baffle step, passive crossovers and SPL estimates.
Plan the enclosure before cutting panels
Speaker box volume, port tuning and driver parameters are linked decisions. Start with enclosure volume from panel dimensions, then use Thiele-Small alignment, port length and slot port calculators to check whether the box and tuning make sense for the driver.
Use baffle step and passive crossover calculators when the cabinet shape and driver layout affect tonal balance. SPL estimates help confirm whether the finished speaker or subwoofer can reach the required level at the intended listening distance.
Speaker design calculator links
Speaker Box Volume Calculator
Calculate internal loudspeaker enclosure volume from panel dimensions.
3D Speaker Box Volume Calculator
Calculate internal speaker enclosure volume with a 3D cabinet preview for DIY loudspeaker design.
Pentagonal Speaker Box Calculator
Calculate the internal volume and geometry of a pentagonal monitor speaker enclosure.
Bass Reflex Port Calculator
Calculate bass reflex port length from box volume, tuning frequency and port diameter.
Slot Port Calculator
Rectangular slot port dimensions for vented speaker enclosures.
Thiele-Small Alignment Calculator
Sealed and ported volume suggestions.
Baffle Step Calculator
Baffle-step frequency from width.
Speaker Crossover Calculator
Crossover frequency, capacitor and inductor values for passive speaker design.
SPL from Power Calculator
Sensitivity, power, and distance.
Subwoofer Box Calculator
Subwoofer enclosure planning for sealed and ported DIY builds.
Subwoofer Design Wizard
Guided subwoofer enclosure design from a driver or target frequency, with ports, warnings and cut lists.