Physics & Engineering / Electrical Engineering
Wire Gauge Calculator (Current Capacity)
NEC recommends 3% max
Wire Gauge Reference
Ampacity: Maximum continuous current carrying capacity
Voltage Drop: (2 × Length × Current × Resistance) / 1000
NEC Recommendation: 3% maximum voltage drop for branch circuits
Note: This calculator uses copper wire, 75°C rating. Consult NEC and licensed electrician for final installation.
Use this wire gauge calculator (current capacity) to compute electrical engineering results from your inputs.