Wire Gauge Calculator
Determine the appropriate wire gauge for electrical circuits based on current and distance.
Wire Gauge Calculator
Determine the appropriate wire gauge for electrical circuits based on current, distance, and voltage requirements.
Recommended Wire Gauge
Voltage Drop
Safety Notes
- • Always consult local electrical codes
- • Consider ambient temperature factors
- • Use proper conduit and protection
- • Have work inspected by qualified electrician
AWG Wire Gauge Reference
| Wire Gauge | Max Current (Amps) | Diameter (mm) |
|---|---|---|
| 14 AWG | 15 A | 1.63 mm |
| 12 AWG | 20 A | 2.05 mm |
| 10 AWG | 30 A | 2.59 mm |
| 8 AWG | 40 A | 3.26 mm |
| 6 AWG | 55 A | 4.11 mm |
| 4 AWG | 70 A | 5.19 mm |
| 2 AWG | 95 A | 6.54 mm |
| 1 AWG | 110 A | 7.35 mm |
| 1/0 AWG | 125 A | 8.25 mm |
| 2/0 AWG | 145 A | 9.27 mm |
| 3/0 AWG | 165 A | 10.4 mm |
| 4/0 AWG | 195 A | 11.68 mm |
About This Calculator
Choose suitable wire size based on current and run length to minimize overheating and voltage drop risks.
Formula
Ampacity and voltage-drop sizing based on current, distance, and conductor material.
Example
Input current demand and distance to compare recommended conductor gauges.
When to Use
- Residential wiring planning
- Automotive electrical installs
- Panel and branch circuit design
Best Practices
- Validate units and assumptions before interpreting output.
- Compare at least two scenarios to avoid single-point bias.
- Use results as decision support, then cross-check critical outcomes.
FAQ
Can I rely on Wire Gauge Calculator for important decisions?
Use it as a fast and consistent estimator, then verify inputs and assumptions for high-stakes decisions.
Why might my result differ from another tool?
Different tools may use different rounding rules, defaults, or formula variants. Align assumptions before comparing.
Important Note
Results are informational and should be independently verified for legal, medical, engineering, or financial use.
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