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Subwoofer box, port and wiring calculators

How big a box for a 12" sub, how long a port to tune to 32 Hz, how to wire two dual 2 ohm subs to 1 ohm, what gauge wire and fuse a 2,000 watt amp needs. Free answers in inches and liters with the formula shown, no sign-up and no subscription. The Android app works offline and keeps your builds.
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Box & port
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Subwoofer Box Calculator with Cut Sheet
Net volume of your sub box, or the width you need for a target ft³: sub and port displacement, double baffle, wedge boxes and a cut sheet in fractions.
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Port Length Calculator: Round and Aero Ports
How long a round or aero port must be to tune your box to 32 Hz (or any tuning), or what a port you have tunes to.
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Slot Port Calculator: Length, Area and Displacement
Slot port length for your tuning, its area per ft³ and how much box it takes up, wall included.
Wiring & power
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Subwoofer Wiring & Ohm Load Calculator
Every final ohm load from 1 to 4 subs, single or dual voice coil, any impedance: wiring diagram for each and a check against your amp’s minimum load.
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Amp to Sub Matching Calculator: RMS Power
Is your amp under-powered, a good match or too much for your subs? RMS per sub, number of subs and amp RMS at the final load.
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Amp Wire Gauge & Fuse Size Calculator (12 V)
Power and ground wire gauge, fuse size and Big 3 gauge for your amp: current draw from RMS watts, copper or CCA, voltage drop over your run.
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Car Audio Current Draw & Alternator Calculator
How many amps your system pulls at full power, whether your alternator keeps up, and the battery and capacitor rules of thumb.
Charts & units
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Subwoofer Box Size Chart: Sealed and Ported
Typical net box volume for 6.5", 6x9, 8", 10", 12", 15" and 18" subs, sealed and ported, for one to four subs.
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Amp Wire Gauge Chart by Watts and Length
Power wire gauge and fuse for 500 to 5,000 watt amps at 10, 15 and 20 ft runs, copper or CCA, class D or A/B.
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Box Volume Calculator: Cubic Feet, Liters, Cubic Inches
Inside volume of any box from its outside or inside size, in ft³, liters and in³, plus a volume converter.

Box size by sub

Sealed box size for a 8" sub
Sealed box size for 2 8" subs
Sealed box size for 3 8" subs
Ported box size for a 8" sub
Ported box size for 2 8" subs
Ported box size for 3 8" subs
Sealed box size for a 10" sub
Sealed box size for 2 10" subs
Sealed box size for 3 10" subs
Ported box size for a 10" sub
Ported box size for 2 10" subs
Ported box size for 3 10" subs
Sealed box size for a 12" sub
Sealed box size for 2 12" subs
Sealed box size for 3 12" subs
Ported box size for a 12" sub
Ported box size for 2 12" subs
Ported box size for 3 12" subs
Sealed box size for a 15" sub
Sealed box size for 2 15" subs
Sealed box size for 3 15" subs
Ported box size for a 15" sub
Ported box size for 2 15" subs
Ported box size for 3 15" subs

Wiring diagrams by sub and load

How to wire a dual 1 ohm sub to 0.5 ohm
How to wire a dual 1 ohm sub to 2 ohm
How to wire 2 dual 1 ohm subs to 1 ohm
How to wire 2 dual 1 ohm subs to 4 ohm
How to wire 3 dual 1 ohm subs to 0.67 ohm
How to wire 3 dual 1 ohm subs to 1.5 ohm
How to wire 3 dual 1 ohm subs to 6 ohm
How to wire 4 dual 1 ohm subs to 0.5 ohm
How to wire 4 dual 1 ohm subs to 2 ohm
How to wire 4 dual 1 ohm subs to 8 ohm
How to wire a dual 2 ohm sub to 1 ohm
How to wire a dual 2 ohm sub to 4 ohm
How to wire 2 dual 2 ohm subs to 0.5 ohm
How to wire 2 dual 2 ohm subs to 2 ohm
How to wire 2 dual 2 ohm subs to 8 ohm
How to wire 3 dual 2 ohm subs to 1.33 ohm
How to wire 3 dual 2 ohm subs to 3 ohm
How to wire 4 dual 2 ohm subs to 1 ohm
How to wire 4 dual 2 ohm subs to 4 ohm
How to wire a dual 4 ohm sub to 2 ohm
How to wire a dual 4 ohm sub to 8 ohm
How to wire 2 dual 4 ohm subs to 1 ohm
How to wire 2 dual 4 ohm subs to 4 ohm
How to wire 3 dual 4 ohm subs to 0.67 ohm
How to wire 3 dual 4 ohm subs to 2.67 ohm
How to wire 3 dual 4 ohm subs to 6 ohm
How to wire 4 dual 4 ohm subs to 0.5 ohm
How to wire 4 dual 4 ohm subs to 2 ohm
How to wire 4 dual 4 ohm subs to 8 ohm
How to wire 2 single 1 ohm subs to 0.5 ohm
How to wire 2 single 1 ohm subs to 2 ohm
How to wire 3 single 1 ohm subs to 3 ohm
How to wire 4 single 1 ohm subs to 1 ohm
How to wire 4 single 1 ohm subs to 4 ohm
How to wire 2 single 2 ohm subs to 1 ohm
How to wire 2 single 2 ohm subs to 4 ohm
How to wire 3 single 2 ohm subs to 0.67 ohm
How to wire 3 single 2 ohm subs to 6 ohm
How to wire 4 single 2 ohm subs to 0.5 ohm
How to wire 4 single 2 ohm subs to 2 ohm
How to wire 4 single 2 ohm subs to 8 ohm
How to wire 2 single 4 ohm subs to 2 ohm
How to wire 2 single 4 ohm subs to 8 ohm
How to wire 3 single 4 ohm subs to 1.33 ohm
How to wire 4 single 4 ohm subs to 1 ohm
How to wire 4 single 4 ohm subs to 4 ohm

Port length by tuning

Port length for 28 Hz tuning
Port length for 30 Hz tuning
Port length for 32 Hz tuning
Port length for 34 Hz tuning
Port length for 36 Hz tuning
Port length for 38 Hz tuning
Port length for 40 Hz tuning

Amp wire gauge by watts

What gauge wire for a 500 watt amp?
What gauge wire for a 750 watt amp?
What gauge wire for a 1,000 watt amp?
What gauge wire for a 1,500 watt amp?
What gauge wire for a 2,000 watt amp?
What gauge wire for a 2,500 watt amp?
What gauge wire for a 3,000 watt amp?
What gauge wire for a 3,500 watt amp?
What gauge wire for a 4,000 watt amp?
What gauge wire for a 5,000 watt amp?

Big 3 and fuse size

Big 3 upgrade: what gauge wire?
Amp fuse size: biggest fuse for each wire gauge

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