Calculate total electrical load for a circuit. Add appliances to find total watts and amps, and check against your breaker capacity.
Appliances / Loads
Safe (≤80%)
| Total Watts | 270 W |
| Total Amps | 2.25 A |
| Load % | 11.3% |
| Breaker Capacity | 2400 W (20A) |
| NEC 80% Limit | 16.0 A |
| Remaining Headroom | 13.75 A |
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Total Amps = Total Watts ÷ Voltage
NEC 80% rule: Max continuous load = 80% of breaker rating
Total load (watts) = sum of all device wattages. Amps = Watts ÷ Voltage. NEC requires circuits loaded to no more than 80% of breaker rating for continuous loads.
The NEC 80% rule states that continuous loads (running 3+ hours) must not exceed 80% of the breaker's rated ampacity.
A 15A, 120V circuit = 1800W total. At 80% NEC limit: 1440W for continuous loads.
NEC doesn't limit outlet count, but total load must not exceed 80% of breaker capacity for continuous loads. Typically 8–10 outlets per 15A circuit.
Calculations are for educational purposes only. Consult a qualified financial advisor for personalized advice.