Breaker Size Calculator
Determine the correct circuit breaker amperage for your electrical load to ensure safety and NEC compliance.
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Circuit Details
Continuous: Runs for 3+ hours (e.g., lighting, heaters). Requires 125% sizing factor.
W
Recommended Breaker
--
A
Load Current: -- A
Required Rating (w/ Safety): -- A
Recommended Copper Wire:
-- AWG
Next Standard Size Up
Common Breaker Sizes & Uses
| Breaker | Min Wire Gauge (Copper) | Max Continuous Load (120V) | Max Continuous Load (240V) | Typical Applications |
|---|
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Safety Warning
Using the wrong size breaker is a fire hazard. Never replace a breaker with a larger size without verifying the wire gauge can handle the increased current. The wire must always be rated for the breaker size (e.g., 14 AWG for 15A, 12 AWG for 20A). Always hire a licensed electrician for panel work.