Compare calculators

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

Estimate the minimum service amperage your home's electrical panel needs based on lighting, kitchen appliances, and HVAC loads. Use this before upgrading a panel or planning a new home build.

General Lighting & Outlets (watts)

Kitchen Appliances (watts)

HVAC Load (watts)

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	3
Result	Heating Load Required (watts)	Panel Capacity Needed (amps)
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.	Estimate the minimum service amperage your home's electrical panel needs based on lighting, kitchen appliances, and HVAC loads. Use this before upgrading a panel or planning a new home build.