Estimate electrical service load, connected load, demand load, demand amps, recommended service size, remaining capacity, and service load percentage for residential or light commercial planning.
Connected load:
The calculator adds general load, small appliance circuits, laundry circuits, and fixed equipment loads.
Demand load:
The connected load is multiplied by the selected demand factor to estimate the service demand load.
Service size:
Demand amps are compared to the existing service size and rounded to a common recommended service size.
A service load calculator helps estimate whether an existing electrical service may have enough capacity for current or planned loads.
It can help with service upgrade planning, EV charger planning, HVAC upgrades, large appliance additions, workshop circuits, garage panels, subpanels, additions, and general electrical planning.
Your result shows connected watts, demand watts, demand amps, service load percentage, existing service size, remaining capacity, recommended service size, target service size, and comparison scenarios.
Add the connected electrical loads, apply appropriate demand factors, convert the demand load to amps, then compare the result to the service size.
They are related, but not always the same. Service load looks at the electrical service capacity, while panel load may focus on one panel or subpanel.
No. A subpanel can add breaker spaces and distribution, but the available capacity is still limited by the main electrical service and calculated demand load.
No. This is a simplified planning tool. Official service calculations depend on electrical code, utility requirements, equipment nameplates, demand factors, service conductors, permits, and local inspection rules.