Home Electrical Load Calculator
Estimate your home's electrical demand using the NEC load-calculation method — with the demand factors that naive 'add up the watts' tools miss — and see whether your 100A or 200A service has room for a new load like an EV charger or heat pump.
Within capacity
167 A / 200 A
84% of service used (calculated demand)
- General lighting + small-appliance (demand)
- 5,625 VA
- Electric range
- 8,000 VA
- Electric dryer
- 5,000 VA
- Water heater + fixed appliances
- 6,000 VA
- Heating / cooling (larger of)
- 3,500 VA
- EV charger (125% continuous)
- 12,000 VA
NEC Article 220 standard method with demand factors — an estimate, not a stamped load calc. The EV charger counts at 125% (continuous). A licensed electrician and your local AHJ make the final call; service upgrades also need utility coordination.
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Open calculatorSources & standards
This tool's methodology and data follow US standards and authoritative public datasets: