Compare calculators

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

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.

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

	Circuit Breaker Size Calculator	Home Generator Size Calculator
Category	Electrical Home	Electrical Home
Inputs required	2	2
Result	Circuit Breaker Size (amps)	Generator Size Needed (watts)
What it does	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.	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.