⚡ Wire Gauge Ampacity Calculator
Determine the correct wire size based on NEC Table 310.16. Ensure safety and compliance.
✅ Formula verified against standard references
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Last Updated: Jan 2026
Minimum Wire Size
12 AWG
Rated for 25 Amps
💡 Expert Tips
Voltage Drop Matters. For runs over 100 feet, you often need to upsize the wire to prevent voltage drop, even if the ampacity is sufficient.
Breaker Sizing. The wire must always be rated equal to or greater than the breaker size. You can put 12 AWG wire on a 15A breaker, but NEVER put 14 AWG wire on a 20A breaker.