How does the Electrical Load Calculator work?

Sum connected loads and apply demand factors per code Then: Typical demand factors: lighting 100%, HVAC 100%, convenience outlets 50-100% Then: Size service for total demand + margin for future growth.

Can you give an example of how to use the Electrical Load Calculator?

Example: Input Lighting 50 kW, HVAC 150 kW, outlets 30 kW, motors 100 kW gives a result of Total demand ≈ 270 kW + 25% margin = 338 kW service (Code-compliant sizing).

Is the Electrical Load Calculator free to use?

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

How accurate is the Electrical Load Calculator?

Our Electrical Load Calculator uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

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Electrical Load Calculator

Lighting Load (kW)

Receptacles Load (kW)

HVAC Load (kW)

Appliances Load (kW)

Electrical load calculation determines service size, feeder, and branch circuit requirements. Under-sizing risks overheating; over-sizing wastes cost.

Difficulty:intermediate

References

›Electrical Load — Wikipedia

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Electrical Load Calculator

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Electrical Load Calculator