Electrical Load Calculator
Estimate your home's electrical service requirements using the NEC standard calculation method. Determine if you need 100, 150, or 200 amp service.
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sq ft
NEC requires min 2 for kitchen
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Frequently Asked Questions
What size electrical service do most homes need?
Most modern homes need 200 amp service. Older small homes may have 100 amp, which can be limiting if you add AC, electric appliances, or EV charging.
What is a demand load calculation?
NEC (National Electrical Code) allows you to apply demand factors -- the first 10,000 watts at 100% and the remainder at 40% -- because not everything runs at once.
When should I upgrade my service?
If your calculated demand exceeds 80% of your current service (e.g., over 160 amps on a 200 amp panel), or if you are adding major loads like EV chargers, hot tubs, or workshops.
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