Circuit Breaker Sizing Calculator — NEC 125% Rule | WireStandard
Size circuit breakers correctly with NEC 125% continuous load rule. Add multiple loads, specify continuous vs non-continuous, get recommended standard breaker size.
- Voltage (V)
- Load List
- Continuous
- Non-Continuous
- Remove
- + Add Load
- Recommended Breaker Size
- Continuous Load
- Non-Continuous Load
- Total Load
- Adjusted Load (NEC 125%)
- Out of table range — consult engineer
NEC 210.20: Continuous loads × 1.25. Standard breaker sizes: 15, 20, 25, 30, 35, 40, 45, 50, 60, 70, 80, 90, 100, 110, 125, 150, 175, 200A.