Car Audio Toolbox
Offline calculators and reference guides for car audio installers and enthusiasts — amp power, wire gauge, fuse size, box volume, and more, right on your phone. No sign-in, no internet required.
Screenshots
Electrical & power calculators
Amplifier Power Calculator
Estimate RMS power output from voltage, current draw, and amplifier class.
Wire Gauge Calculator
Find the right AWG for your amp’s power and ground wiring.
Fuse Size Calculator
Size a fuse that protects your wire, not just your amp.
Ohm / Impedance Load Calculator
Series, parallel, and series-parallel speaker wiring configurations.
Amplifier Gain Setting Calculator
A calculated starting point before fine-tuning with a meter.
Voltage Drop Calculator
Check real-world voltage drop for a chosen wire run.
Battery Runtime Calculator
Estimate runtime for AGM or lithium battery banks.
Box design calculators
Sealed Box Volume Calculator
Net internal volume from your box dimensions.
Ported Box Volume Calculator
Net volume accounting for port displacement.
Port Length Calculator
Tune a round or slot port to your target frequency.
Slot Port Area Calculator
Check port area against a port-noise guideline.
Reference & learning
Speaker & Subwoofer Wiring Diagrams
Series, parallel, and dual-voice-coil configurations.
Car Audio Glossary
30+ plain-language definitions, from RMS to Xmax.
Troubleshooting Guide
Step-by-step checks for no-power, no-sound, and noise issues.
Installation Checklist
A phase-by-phase safety checklist for your next install.
Get Car Audio Toolbox — free
Works completely offline. No account required.
Car Audio Toolbox is a planning and reference tool. Always confirm critical specs like fuse ratings and wire gauge against your equipment’s manual, and have complex installs reviewed by a qualified installer. Google Play and the Google Play logo are trademarks of Google LLC.