Complete reference for American Wire Gauge (AWG) sizes, ampacity ratings, resistance values, and practical applications.
| AWG | Diameter (mm) | Area (mm²) | Copper Ampacity | Aluminum Ampacity | Details |
|---|---|---|---|---|---|
| 4 AWG | 5.189 | 21.15 | 85A | 65A | View Details → |
| 6 AWG | 4.115 | 13.30 | 65A | 50A | View Details → |
| 8 AWG | 3.264 | 8.37 | 50A | 40A | View Details → |
| 10 AWG | 2.588 | 5.26 | 35A | 30A | View Details → |
| 12 AWG | 2.053 | 3.31 | 25A | 20A | View Details → |
| 14 AWG | 1.628 | 2.08 | 20A | 15A | View Details → |
* Ampacity values based on NEC Table 310.16 for 75°C rated conductors
Standard wire for 15A lighting circuits. Most common residential wire size.
Standard wire for 20A outlet circuits. Kitchen, bathroom, and garage outlets.
Used for 30A circuits including dryers and water heaters.
For 40-50A circuits. Electric ranges, large AC units, and EV chargers.
Heavy-duty applications. Sub-panels, large appliances, and hot tubs.
Sub-panel feeders and large EV chargers. 70-85A capacity.
The American Wire Gauge (AWG) system is the standard for measuring electrical wire sizes in North America. Lower AWG numbers indicate thicker wires with higher current-carrying capacity.
The maximum current a wire can safely carry continuously without exceeding its temperature rating.
Each 3 AWG decrease doubles the wire cross-sectional area (e.g., 10 AWG is twice the area of 13 AWG).
Wire insulation ratings (60°C, 75°C, 90°C) affect ampacity. Higher ratings allow more current.
NEC Table 310.16 provides the standard ampacity ratings used in electrical installations.
Use our calculator to verify your wire size selection meets voltage drop requirements.