Voltage Drop Calculator (Residential)

Calculate voltage drop for residential wiring and check compliance with the NEC 3% recommendation.

Wire Gauge (AWG)

One-Way Distance

Current

System Voltage

Voltage Drop

3.57 V

Drop Percentage2.98%

Voltage at Load116.43 V

NEC 3% Compliant1

Power Loss53.6 W

Voltage Drop

3.57 V

How to Use This Calculator

Start by filling in the input fields below. Results update instantly as you type, so you can experiment with different values to see how they affect the outcome.
Wire Gauge (AWG) — AWG wire gauge of the installed or planned conductor. Choose from: 14 AWG, 12 AWG, 10 AWG, 8 AWG, 6 AWG, 4 AWG, 2 AWG, 1 AWG, 1/0 AWG. default: 12.
One-Way Distance — One-way distance from panel to the load in feet. Accepts values from 1 ft to 1,000 ft (default: 75 ft).
Current — Current draw of the circuit load in amps. Accepts values from 1 A to 200 A (default: 15 A).
System Voltage — Nominal system voltage of the circuit. Choose from: 120V, 240V. default: 120.
Once all inputs are set, review your results in the Results panel. Here's what each output means:
Voltage Drop — shown as a numeric value. This is the primary result of this calculator.
Drop Percentage — shown as a numeric value.
Voltage at Load — shown as a numeric value.
NEC 3% Compliant — shown as a numeric value.
Power Loss — shown as a numeric value.
Explore the related calculators below if you need deeper analysis or want to approach this topic from a different angle.

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