Electrical Load Calculator
Calculate total electrical load and required panel capacity for residential or commercial applications
About this calculator
The Electrical Load Calculator helps determine the total electrical demand and required panel capacity for residential and commercial properties. By calculating the combined load of all electrical devices, appliances, and systems, this tool ensures proper electrical panel sizing and prevents overloading circuits. It's essential for electrical planning, renovations, upgrades, and ensuring code compliance while maintaining safety standards.
How to use
Enter the power ratings (watts or amps) of all electrical devices, appliances, and systems in your building. Include lighting, HVAC, outlets, major appliances, and any special equipment. The calculator will sum the total load and recommend the appropriate electrical panel capacity based on safety factors and electrical codes.
Frequently asked questions
What electrical loads should I include in my calculation?
Include all lighting, appliances, HVAC systems, outlets, motors, and any special equipment like welders or electric vehicle chargers that will be connected.
How much safety margin should I add to my calculated load?
Typically add 25-30% safety margin to your calculated load to account for future expansion and prevent operating at maximum capacity.
What's the difference between continuous and non-continuous loads?
Continuous loads operate for 3+ hours continuously and require 125% factor in calculations, while non-continuous loads use their actual rated capacity.