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Breaker Size Calculator
Apply the 80% rule to size circuit breakers for continuous loads
📖 Breaker Size Calculator
NEC guidelines recommend loading a breaker to no more than 80% of its rating for continuous operation. Breaker Size = Load Current ÷ 0.8. When only power is known, Current = (Power) ÷ (Voltage × Power Factor).
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💡 Tips & Information
- Breaker Size Calculator uses standard engineering formulas; always verify with project requirements.
- Keep units consistent across all inputs to avoid conversion errors.
- Field conditions, tolerances, and safety factors may require additional adjustments.