Subwoofer Enclosure Calculators

Garage Audio · Subwoofer Box Tools

Subwoofer Box Calculators

Work out internal box volume, slot port length, inch-to-millimetre conversions and basic cut sheets for sealed or ported subwoofer enclosures. Enter the box dimensions once and the cut sheet generator will auto-fill the matching fields.

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Box Volume Calculator

Enter outside dimensions and material thickness to estimate internal volume.

Outside Width (mm)

Outside Height (mm)

Outside Depth (mm)

Material Thickness (mm)

Internal Volume -

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Slot Port Length Calculator

Port length estimate based on port area, enclosure volume and tuning frequency.

Port Width (mm)

Port Height (mm)

Box Volume (L)

Tuning Frequency (Hz)

Estimated Port Length -

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Inches To Millimetres

Quick imperial to metric conversion for box design.

Inches

Millimetres

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Cut Sheet Setup

Box dimensions auto-fill from the volume calculator. Add cutout and port details if needed.

Box Type

Material

Outside Width (mm)

Outside Height (mm)

Outside Depth (mm)

Sub Cutout (mm)

Port Width (mm)

Port Height (mm)

Port Length (mm)

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Your Cut Sheet

Generated panel list will appear below after dimensions are entered.

Cut Sheet Summary

Panel	Qty	Width	Height	Notes

Important: These calculators are intended as a helpful guide only. Final enclosure design should account for subwoofer displacement, port displacement, bracing, vehicle loading, desired tuning, amplifier power and manufacturer specifications. For best results, speak with Garage Audio before cutting timber.

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