Wire & Fuse Calculator

New to wire sizing? Start with How to Use This Calculator

Device/Load Name (optional) Helps you keep track when planning multiple circuits

Amp Draw (A) * 💡 The continuous current your device draws. Check device specs or use actual measurement.

Wire Run Length (feet, one way) * 💡 Measure from power source to device location. Longer runs need thicker wire.

System Voltage * 💡 Most passenger vehicles use 12V. RVs, boats, and commercial vehicles often use 24V.

No circuits yet. Click "Add Circuit" to get started.

Total Current Draw

0 A

Total Power

0 W

Circuits

0

Largest Wire Needed

--

Total Wire Cost

$0.00

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Build a system in the System Builder tab and click "Save System" to save it here.