Wire Size & Voltage Drop Calculator
Instant, NEC-referenced wire gauge recommendations. Enter your amperage, voltage, and distance to get the exact AWG size, voltage drop, and breaker rating.
Instant Answer
Use 8 AWG Copper Wire
Estimated Voltage Drop: 1.95% · Limit: 3%
| Recommended AWG | 8 AWG Copper |
| Circular Mils (CM) | 16,510 |
| Voltage Lost | 2.34 V |
| Percent Drop | 1.95% |
| Power Lost | 70.3 W |
| Conductor Ampacity (75°C) | 50 A |
| Max Recommended Fuse/Breaker | 40 A |
Based on NEC Table 310.16 (75°C ampacity) and Chapter 9, Table 8 (circular mils). Assumes a 30°C (86°F) ambient, ≤3 current-carrying conductors. Always verify against your local jurisdiction's current NEC/CEC adoption before installation.
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