Voltage Drop Calculator — Quick & Accurate Online Calculator & Guide
Calculate voltage drop over a wire run based on AWG gauge, wire length, and current. Checks compliance with the NEC 3% recommended maximum.
✓ Formula verified: May 2026
Voltage Drop
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Voltage Drop
4.710 V (3.92%)
Voltage at Load
▲ 115.29 V
Total Wire Resistance
0.3140 Ω
Power Loss in Wires
▼ 70.65 W (3.92% of total)
NEC Compliance
Marginal — within 5% max
What if your source voltage changes? 108 V → 4.710 V (4.36%) · 120 V → 4.710 V (3.92%) · 132 V → 4.710 V (3.57%)
Scenario Comparison
Conservative (5%)
$16,470.09
$6,470.09 interest
Your scenario (7%)
$20,096.61
$10,096.61 interest
Aggressive (10%)
$27,070.41
$17,070.41 interest
High-risk (14%)
$40,224.71
$30,224.71 interest
Best return
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Voltage Drop
Voltage Drop
4.710 V (3.92%)
Borderline — consider larger wire
Voltage Drop %3.92%
0%3% (Good)5% (Max)10%
Voltage at Load115.29 V
Wire Resistance0.3140 Ω
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