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eng.electrical-panel-load Calculator
Calculates electrical panel load, circuit breaker sizing, and feeder conductor requirements from connected loads and demand factors. The NEC requires service entrance to be sized for the calculated load plus 25% for continuous loads — this determines the service panel ampacity.
Inputs
Total Amperage
Age in completed years. Many health and fitness formulas adjust for age.
Load1 Amps
Reference formula or conversion factor shown for context.
Load2 Amps
Reference formula or conversion factor shown for context.
Voltage
Electric potential difference (V). Drives current through a circuit. Household: 120 V (US) or 230 V (EU/UK).
Results
panel load
Sample size or count used in the calculation.
total current draw (A)
Electric charge flow rate (A). Governs wire sizing — too much current causes dangerous heating. Fuses protect circuits from overcurrent.
power draw (kW)
Reference formula or conversion factor shown for context.
available capacity
Reference formula or conversion factor shown for context.
NEC 80% rule
Sample size or count used in the calculation.
over 80%?
Reference formula or conversion factor shown for context.