Compare calculators
Both calculators run independently — change the inputs on either side to compare results.
Electrical Home
Electrical Box Fill Calculator
Calculate how many additional wires fit in an electrical junction box after accounting for installed devices. Critical for NEC compliance when adding wires or devices to an existing box.
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
| Electrical Box Fill Calculator | Home Generator Size Calculator | |
|---|---|---|
| Category | Electrical Home | Electrical Home |
| Inputs required | 3 | 5 |
| Result | Maximum Wire Connections (wires) | Recommended Generator Size (kW) |
| What it does | Calculate how many additional wires fit in an electrical junction box after accounting for installed devices. Critical for NEC compliance when adding wires or devices to an existing box. | 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. |