Compare calculators
Both calculators run independently — change the inputs on either side to compare results.
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.
Fill in the required fields to see your result.
Electrical Home
Circuit Breaker Size Calculator
Determine the correctly sized circuit breaker for any electrical load, accounting for continuous versus non-continuous use, ambient temperature, and safety margins. Use it before wiring a new circuit or replacing a breaker.
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 | 4 |
| Result | Generator Size Needed (watts) | Minimum 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 sized circuit breaker for any electrical load, accounting for continuous versus non-continuous use, ambient temperature, and safety margins. Use it before wiring a new circuit or replacing a breaker. |