Wire Gauge Calculator
Calculate the recommended wire gauge (AWG) for your electrical project. Input current, distance, and voltage to find the right wire size and voltage drop.
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AWG Reference Table (Copper)
| AWG | Ampacity (60C) | Ampacity (75C) | Common Use |
|---|---|---|---|
| 14 | 15A | 20A | Lighting circuits |
| 12 | 20A | 25A | General outlets |
| 10 | 30A | 35A | Dryers, AC units |
| 8 | 40A | 50A | Ranges, large appliances |
| 6 | 55A | 65A | Large AC, sub-panels |
| 4 | 70A | 85A | Feeders |
| 2 | 95A | 115A | Service entrance |
| 1/0 | 125A | 150A | Service entrance |
How to Use the Wire Gauge Calculator
- Enter the current draw in amps for your circuit.
- Enter the one-way distance from the panel to the load in feet.
- Enter the system voltage (120V, 240V, etc.).
- Select single-phase or three-phase.
- Set maximum acceptable voltage drop (3% is standard).
- Click Calculate to see the recommended wire gauge.
Why Voltage Drop Matters
Excessive voltage drop in wiring can cause equipment malfunction, reduced efficiency, and safety hazards. The NEC recommends a maximum voltage drop of 3% for branch circuits and 5% for combined feeder and branch circuits. Longer runs and higher currents require larger wire gauges.
Features
- Voltage drop calculation for copper conductors
- Single-phase and three-phase support
- Configurable maximum voltage drop percentage
- Complete AWG reference table with ampacities
- One-click copy result to clipboard
- 100% client-side processing for full privacy
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Disclaimer: This tool is provided as-is for informational and educational purposes only.