Compare calculators
Both calculators run independently β change the inputs on either side to compare results.
Electrical
Electrical Load Calculator
Compute the total electrical demand of a building by summing lighting, appliance, HVAC, and motor loads, then applying an NEC-compliant demand factor. Used by electricians and engineers to size service panels and main breakers.
Fill in the required fields to see your result.
Electrical
Battery Runtime Calculator
Estimate how many hours a battery will power a device based on its capacity, discharge depth, and system efficiency. Ideal for sizing backup power, solar storage, and portable electronics.
Fill in the required fields to see your result.
Key differences
| Electrical Load Calculator | Battery Runtime Calculator | |
|---|---|---|
| Category | Electrical | Electrical |
| Inputs required | 5 | 4 |
| Result | Required Panel Capacity (W) | Runtime (hours) |
| What it does | Compute the total electrical demand of a building by summing lighting, appliance, HVAC, and motor loads, then applying an NEC-compliant demand factor. Used by electricians and engineers to size service panels and main breakers. | Estimate how many hours a battery will power a device based on its capacity, discharge depth, and system efficiency. Ideal for sizing backup power, solar storage, and portable electronics. |