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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

Home Generator Size Calculator

Find the minimum wattage generator needed to power your essential home appliances during an outage. Accounts for motor startup surges that can trip or damage undersized generators.

Essential Appliances (watts)

Startup Factor (multiplier)

Fill in the required fields to see your result.

Key differences

	Electric Heat Load Calculator	Home Generator Size Calculator
Category	Electrical Home	Electrical Home
Inputs required	5	2
Result	Heating Load Required (watts)	Generator Size Needed (watts)
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.	Find the minimum wattage generator needed to power your essential home appliances during an outage. Accounts for motor startup surges that can trip or damage undersized generators.