Compare calculators
Both calculators run independently — change the inputs on either side to compare results.
Electrical Home
Home Generator Size Calculator
Determine the right generator size (in kilowatts) to keep your home's essential appliances running during a power outage. Use it when planning an emergency generator purchase or sizing a transfer switch installation.
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 | 5 | 4 |
| Result | Recommended Generator Size (kW) | Minimum Breaker Size (amps) |
| What it does | Determine the right generator size (in kilowatts) to keep your home's essential appliances running during a power outage. Use it when planning an emergency generator purchase or sizing a transfer switch installation. | 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. |