Residential Electrical Load Calculator
Find out if your home’s electrical panel can actually handle an EV charger, a backup generator, or that new addition — before you spend a dollar on equipment.
Before you buy an EV charger, add a hot tub, finish the basement, or install a whole-home generator, there’s one question worth answering first: does your panel have the capacity for it?
An overloaded panel isn’t just inconvenient — it trips breakers, shortens the life of your equipment, and is one of the most common reasons a permit gets flagged at inspection. Guessing is risky; a real electrical load calculation isn’t.
This free tool uses the same load-calculation method (NEC Article 220) licensed electricians use in the field — not a rough guess. Answer a few questions about your home’s size, circuits, and appliances, and you’ll get an estimated total load, your amperage draw, and the panel size we’d recommend.
Electrical Load Calculator
Answer the questions below to get an estimate of your home's electrical load. It may be helpful to check the nameplates on your large appliances (like your HVAC or oven) for their Watt or Amp ratings.
Living Space General Load
0 VA
3000 VA
0 VA
Total General Load:0 VA
First 3000VA at 100%:0 VA
Remainder at 35%:0 VA
Net General Load:0 VA
Fixed Appliances
0 VA
Fixed Appliances Total:0 VA
Demand Factor: <4 @ 100% / 4+ @ 75%
Net Fixed Appliances Load:0 VA
Heating, Cooling & Major Loads
HVAC Load
*Use the larger of heating or cooling VA. Find on the unit's nameplate rating.
Total HVAC Load:0 VA
Major Appliances
8000 VA
5000 VA
Additional Loads
For informational purposes only. Consult a licensed electrician for a precise load calculation and professional advice.
Total Calculated Load
Volt-Amps (VA)
0 VA
Amperage
0.00 A
(at 240V)
Recommended Panel
N/A
Use this electrical load calculator to check whether your current panel can support:
- A Level 2 EV charger (Tesla, Rivian, Ford F-150 Lightning, and other 240V chargers typically draw 7,200–11,500+ VA)
- A whole-home standby generator or a portable-generator inlet
- A home addition, finished basement, or accessory dwelling unit
- A hot tub, pool equipment, or workshop
- New major appliances — electric range, dryer, or wall oven
If your result comes back close to or over your panel’s rated capacity, that’s not a dead end — it just means a panel upgrade or a load-management solution may be worth a conversation before you install anything.
Calculation Summary
Total Calculated Load: ... VA
Total Amperage (at 240V): ... Amps
Cutting it close?
If your calculated load is at or near your panel’s limit, don’t find out the hard way. Get a free, no-trip-charge estimate from a licensed Wake County electrician on a panel upgrade — most jobs are permitted and completed faster than people expect.
Request a Free Quote or call (919) 888-3500
How do I know if my panel can support an EV charger?
Most Level 2 home EV chargers draw between 7,200 and 11,500 VA (30–48 amps at 240V) continuously (3hrs or more). If your panel is already near its rated capacity from existing lighting, HVAC, and appliances, adding a charger can push you over the limit — that’s exactly what this calculator estimates before you buy the hardware.
What size electrical panel do I need for a generator, EV charger, and central AC together?
It depends on your home’s total calculated load, not just the number of devices. Many mid-size Wake County homes run fine on a 100A panel, but homes adding several large loads at once — a generator, an EV charger, and an electric range, for example — often need 150A or 200A service. Run your specifics through the calculator above for a personalized estimate.
Is this calculator based on real electrical code, or just a rough guide?
It follows the standard method in NEC Article 220 — the same load-calculation approach licensed electricians use, including demand factors for general lighting and fixed appliances. It’s built for planning purposes; a licensed electrician still verifies the final numbers before any permit is filed. Call Today to have one our techs come give a free in-home quote! 919-888-3500
What are my options if my load is close to my panel’s limit?
A few, depending on your situation: a full on-site load calculation and panel upgrade (commonly to 150A or 200A), adding a subpanel for a specific new load, a utility service upgrade, or in some cases a load-management device that lets two large loads like an EV charger and a generator safely share existing capacity without a full panel replacement. We can come determine what is the best option for you and pricing at no charge with our Free in-home quote service
Do I need a permit to upgrade my electrical panel in Wake County?
Yes, panel upgrades and electrical service changes require a permit and inspection in Wake County and most NC municipalities. ARC Electric handles permitting as part of every panel upgrade we do.
Does it cost anything to use this calculator?
No, it’s a free tool for all our Wake County neighbors! No account or contact info required.
ARC Electric is locally and family-owned, licensed, and available 24/7 for emergency service across Wake County and the greater Raleigh area — with free in-home estimates and no trip charge, whatever the calculator turns up.