Find the correct AWG wire size for any circuit based on amperage, run distance, and voltage drop. Results are based on NEC ampacity tables and voltage drop calculations.
Disclaimer: This calculator provides general guidance based on NEC standards. Always consult a licensed electrician and your local electrical code before running wire. Electrical work typically requires a permit and inspection.
NEC recommends 3%
Copper wire, 120V, 3% max voltage drop. Use this as a quick lookup.
| Amps | 25 ft | 50 ft | 75 ft | 100 ft | 150 ft |
|---|---|---|---|---|---|
| 15A | 14 AWG | 12 AWG | 10 AWG | 10 AWG | 8 AWG |
| 20A | 12 AWG | 10 AWG | 8 AWG | 8 AWG | 6 AWG |
| 30A | 10 AWG | 8 AWG | 8 AWG | 6 AWG | 4 AWG |
| 40A | 8 AWG | 8 AWG | 6 AWG | 4 AWG | 2 AWG |
| 50A | 6 AWG | 6 AWG | 4 AWG | 4 AWG | 2 AWG |