About the Electrical Load Calculator
Total connected load, demand load and current draw for a panel or circuit.
Also known as: panel load calculator, connected load, demand factor, circuit load calculator.
How to use this calculator
- Enter lighting load, socket / receptacle load, fixed appliance load, largest motor load and the other fields.
- The result updates instantly as you type — press Calculate (or Enter) at any time.
- Review the breakdown shown under the main result.
- Use Copy result or Share to save the answer or send a link with your inputs.
Electrical Load formula
Demand = connected load × demand factor + 25% of the largest motor
Worked example
Using the values pre-filled in the calculator above:
- Lighting load = 1,200 W
- Socket / receptacle load = 3,000 W
- Fixed appliance load = 6,000 W
- Largest motor load = 2,200 W
- Demand factor = 70 %
- Supply voltage = 230 V
- Power factor = 0.95
the calculator returns:
- Demand load: 9.23 kW
- Connected load: 12.4 kW
- Design current: 42.24 A
- Suggested breaker: 55 A