What's the load?
Amps and one-way distance — the formula doubles the distance for the round trip.
Check the nameplate — or watts ÷ volts.
Panel to the load, one direction only.
What voltage?
Higher voltage means less drop over the same run.
Pick a voltage.
Your wire size
Use this copper wire
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- Voltage drop
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- Load
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- Distance (one-way)
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- Min. breaker
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- Wire needed
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- Copper K factor
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💡 Pro field tips
🧰 Tools you'll need
Tap to check off as you load up.
Est. project cost (optional)
File this estimate under a job name or PO to track what to order. Leave blank to file under "General".
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