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Both calculators run independently — change the inputs on either side to compare results.

Electric Heat Load Calculator

Estimate the electric heating power (in watts) needed to keep a room comfortable in winter. Use it when sizing a space heater, baseboard heater, or radiant panel for any room.

Room Area (sq ft)

Ceiling Height (feet)

Insulation Level

Temperature Difference (°F)

Heat Loss Factor

Fill in the required fields to see your result.

Electrical Home

Electrical Panel Load Calculator

Calculate your home's total electrical panel load and remaining capacity in volt-amperes, so you know whether your panel can support new appliances, an EV charger, or a home addition. Use it before calling an electrician for a panel upgrade assessment.

Panel Rating

General Lighting & Outlets (VA)

Appliance Loads (VA)

HVAC Loads (VA)

Demand Factor

Fill in the required fields to see your result.

Key differences

	Electric Heat Load Calculator	Electrical Panel Load Calculator
Category	Electrical Home	Electrical Home
Inputs required	5	5
Result	Heating Load Required (watts)	Available Panel Capacity (VA)
What it does	Estimate the electric heating power (in watts) needed to keep a room comfortable in winter. Use it when sizing a space heater, baseboard heater, or radiant panel for any room.	Calculate your home's total electrical panel load and remaining capacity in volt-amperes, so you know whether your panel can support new appliances, an EV charger, or a home addition. Use it before calling an electrician for a panel upgrade assessment.