Compare calculators
Both calculators run independently — change the inputs on either side to compare results.
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.
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.
Key differences
| Circuit Breaker Size Calculator | Home Generator Size Calculator | |
|---|---|---|
| Category | Electrical Home | Electrical Home |
| Inputs required | 4 | 5 |
| Result | Minimum Breaker Size (amps) | Recommended Generator Size (kW) |
| What it does | 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. | 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. |