Free tool · Electrical Readiness Checker
How this estimate works: a simplified NEC-style load calculation. Each big load counts at a standard demand value — electric range 32A (NEC Table 220.55 demand for a household range), electric dryer 24A (NEC 220.54 basis), AC / heat pump 30A (a typical 3-ton unit), electric water heater 19A (4,500W ÷ 240V), hot tub 40A (a typical 240V spa) — plus a lights-and-outlets allowance for your home’s size (12–30A). We hold back 20% of what’s left as continuous-load headroom, because an EV charger runs for hours at a stretch. It is an estimate, not a permit calculation: a licensed electrician confirms the final number before any install.
Chargers that fit a tight panel
Got the load-management verdict above? These are the chargers built for it: they watch the whole house and throttle themselves when the range, dryer and AC pile on, so you charge at full speed overnight without the panel upgrade. Our charger hub tracks the load-sharing models worth your money.
What the install actually costs
The charger is the small number. The breaker, the wire run, the permit and the outlet itself decide the real bill — our install cost guide prices every line, and flags the one part never to cheap out on: an industrial-grade 14-50 receptacle built for daily charge cycles, not a bargain-bin dryer outlet.
Read it yourself — the three steps
Three facts about your house decide whether home charging is a simple install or a project: your panel's size, the spare room in it, and where the car sleeps. Answer four questions and the checker below turns them into a straight verdict — and the steps under it walk you through reading all three facts yourself, no electrician required for this part.
Step 1 — Read your main breaker
Open your electrical panel door. The main breaker — usually at the top, larger than the rest — is stamped with a number: 100, 150, or 200 are the common ones. That number is your home's total electrical service in amps, and it's the ceiling everything else shares.
Step 2 — Count the spare slots
A 240V charging circuit needs a double-pole breaker, which takes two adjacent slots. Count the blank plates or unused breakers in your panel. Two or more spare slots is room to work with; a panel with every slot filled isn't a dead end — it means load management or a subpanel enters the conversation.
Step 3 — Measure the run
Where does the car sleep relative to the panel? A charger on the wall next to the panel is the cheapest install there is. Every ten feet of wire run, wall penetration, or finished-ceiling crossing after that adds cost — the Install Cost Guide prices each one.
Your verdict
| Panel | Spare slots | Circuit you can run | Verdict |
|---|---|---|---|
| 200A | 2+ | 60A · 11.5 kW | Ready — full-speed Level 2 |
| 200A | 0–1 | 40–50A with a breaker shuffle | Ready, minor panel work |
| 100–150A | 2+ | 40A · 9.6 kW | Ready for most drivers |
| 100A | 0–1 | Load-managed 40A | Ready with load management |
| Under 100A | Any | — | Talk to an electrician first |
Why 40A is enough for most homes: a 40A circuit adds roughly 290 miles of range over an 8-hour night. Unless you regularly arrive home near empty and leave at dawn, the bigger circuit buys speed you'll never use. The math lives in Charging Speed & Cost.
Next steps: the Electrical Setup hub explains the install itself, and the Buying Guides match chargers to the circuit your verdict gives you.