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Calcimator

Voltage Drop Calculator (Residential)

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

Inputs

ft
A

Results

Voltage Drop

3.57 V

Drop Percentage2.98%
Voltage at Load116.43 V
NEC 3% Compliant1
Power Loss53.6 W
How to Use This Calculator
  1. Select Wire Gauge (AWG) from the dropdown — lower AWG = thicker wire.
  2. Enter One-Way Distance (ft) from panel to load.
  3. Input Current (amps) drawn by the load.
  4. Review Actual Voltage Drop (%) — NEC recommends keeping this below 3% for branch circuits.
  5. If voltage drop exceeds 3%, select the next heavier AWG and recalculate.
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