Voltage Drop Calculator
Check voltage loss, load-side voltage, and whether the selected conductor stays within your target drop.
Circuit Inputs
Project Summary
Within target
Voltage drop
7.92 V
Drop percent
6.6%
Estimated load voltage
112.08 V
Max one-way feet at target
45 ft
Recommendation
This run is above your 3% target. Step up to 8 AWG copper to bring the drop under that threshold at the same load and distance.
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Enter system type, voltage, current, wire size, run length, and target drop to see whether the run is within your threshold.
Why Voltage Drop Matters
Long runs and high current can push load-side voltage below equipment expectations. Checking drop before you pull wire helps avoid callbacks, nuisance trips, and undersized conductors.
Common Questions
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