🏠 Home Electrical Load Estimator
How much electrical service does your home need, and what size standby generator would cover it? Answer a few questions and get the numbers an electrician would calculate.
Simplified NEC 2023 220.82 optional method
Your home
ft²
Use outside dimensions. Leave out open porches, decks and unfinished space you can’t live in.
ft²
Attached garage only. Not counted here: this tool uses the 220.82 optional method, and 220.82(B)(1) excludes garages under NEC 2023. An electrician’s standard-method calculation includes it.
Electric appliances
Tick what you have. Typical ratings are filled in; change them if you know the nameplate.
kW
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kW
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kW
×
VA
×
VA
×
VA
×
VA
×
VA
×
VA
×
VA
×
VA
×
VA
×
VA
×
VA
×
Heating and air conditioning
VA
A heat pump counts as your A/C; otherwise pick the tonnage or enter the nameplate
Your home’s electrical load
Enter your floor area and tick your appliances to see results.
Please note
This is the simplified NEC 2023 220.82 optional method for a single dwelling. Informational estimate only — not a compliance document. Verify all calculations against the NEC edition adopted in your jurisdiction. Calculated per NEC 2023.