Home EV charger installation cost estimator
Your panel, the distance to the charger, and the route the wire takes decide most of the bill. This puts a number on it, checks whether the panel can take the load, and prices the ways around it if it can't.
Built by Aatish Patel, founder of XCharge North America
Will your panel take it?
The number on your main breaker is the service size: 100, 150, 200, or 400 amps (often sold as 320). It's how much the house can draw at once, not how much you use. A charger adds a big, long load, so an electrician checks the rest of the house first.
The usual check for an existing home is a load calculation from the electrical code, known by its section number, 220.83. Add up the house: 3 watts per square foot for lights and outlets, 1,500 for each kitchen and laundry circuit, and the nameplate of every big appliance, counting the larger of heating or cooling. The first 8,000 watts count in full and everything above that at 40%, because nobody runs everything at once. Add the new charger, divide by 240 volts, and compare with the service.
The alternative, section 220.87, uses a year of your actual peak demand from the utility, plus 25%. Some utilities can pull that for you. It often shows more room than the calculation, because real houses use less than the worst case.
If it doesn't fit
- Turn the charger down. Most wall boxes can be set to a lower current at install. The code accepts the lower setting when only the installer can change it. Free, and usually enough.
- Load management. A device that watches the main feed and throttles the charger when the house is busy. The code lets you count the charger at whatever the device allows. Hundreds of dollars, not thousands.
- A service upgrade. The utility gets involved, and so does their calendar. Sometimes the right answer, especially if a heat pump or a second EV is coming.
- A smart splitter. Shares the dryer's outlet with the car and pauses the car when the dryer runs. Cheap. Not pretty, but it works.
Spaces, breakers and old panels
- A 240 volt charger needs a two-pole breaker, which takes two spaces. No spaces? Tandem breakers can free some up where the panel allows them, or a small subpanel adds more.
- Breaker prices vary by brand more than you'd think. The brand has to match the panel. Mixing brands is a code violation, not a bargain.
- An outlet for EV charging needs GFCI protection, usually a GFCI breaker. A hardwired charger doesn't, because it has its own.
- Federal Pacific Stab-Lok and Zinsco panels have a long history of breakers that don't trip when they should. Many electricians will want to replace one before adding a big new load, and so will your insurer.
Pro mode
Pro mode shows the conductor sizing (125% of the charger for continuous load, NM-B from the 60°C column, THHN in conduit from the 75°C column), the voltage drop, the equipment ground, the full 220.83 worksheet, and a toggle for the 2026 code, which counts a new EV charger at 80% instead of folding it into the 40% bucket. It takes a measured peak for 220.87 too.
Limits
A screening estimate in 2026 dollars. It doesn't know what's inside your walls, how your utility handles upgrades, or what your inspector likes. Local amendments change the answer. A licensed electrician does the real design, and this helps you know whether their quote is sane.