⚡ Calculate Wire Size
Recommended Wire Gauge
⚠️ This calculator provides estimates based on NEC guidelines. Always verify with a licensed electrician and local codes.
📚 How It Works
This calculator uses the NEC standard voltage drop formula to determine the appropriate wire gauge. The National Electrical Code recommends a maximum 3% voltage drop for branch circuits and 5% for feeder circuits.
The calculation considers:
- Current-carrying capacity (ampacity)
- Voltage drop over distance
- Wire material (copper vs aluminum)
- Circuit type (single or three phase)
📊 AWG Reference Chart
| AWG | Copper Amps | Aluminum Amps | Diameter (mils) |
|---|---|---|---|
| 14 | 15 | — | 64 |
| 12 | 20 | 15 | 81 |
| 10 | 30 | 25 | 102 |
| 8 | 40 | 35 | 129 |
| 6 | 55 | 40 | 162 |
| 4 | 70 | 55 | 204 |
| 3 | 85 | 65 | 229 |
| 2 | 95 | 75 | 258 |
| 1 | 110 | 85 | 289 |
| 1/0 | 125 | 100 | 325 |