Breaker Size Calculator
Determine the correct circuit breaker size based on load type and requirements.
Results
Enter load information to calculate breaker size.
Standard Breaker Sizes
Common Sizes: 15, 20, 25, 30, 35, 40, 45, 50, 60, 70, 80, 90, 100, 110, 125, 150, 175, 200A
Continuous Loads: Breaker must be rated 125% of load
Wire Protection: Breaker cannot exceed wire ampacity