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).

📊 Result

💡 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.

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Breaker Size Calculator