Compare calculators

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

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.

Electrical Home

Circuit Breaker Size Calculator

Determine the correctly rated circuit breaker amperage for any electrical circuit based on total wattage and voltage. Essential for panel upgrades, new circuit installations, and NEC code compliance.

Total Load (watts)

Circuit Voltage (volts)

Fill in the required fields to see your result.

Key differences

	Home Generator Size Calculator	Circuit Breaker Size Calculator
Category	Electrical Home	Electrical Home
Inputs required	2	2
Result	Generator Size Needed (watts)	Circuit Breaker Size (amps)
What it does	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.	Determine the correctly rated circuit breaker amperage for any electrical circuit based on total wattage and voltage. Essential for panel upgrades, new circuit installations, and NEC code compliance.