How much does it cost to charge an EV at home per month?

Monthly miles, divided by your vehicle's miles per kilowatt-hour, times your price per kilowatt-hour. That is the whole calculation.Two of the three inputs you already have. Your car reports its own lifetime and recent efficiency on the energy screen, and it is a better number than any published figure because it already contains your driving, your climate and your tyres. Your monthly miles you know.The third input is the one every national article gets wrong, because there is no national answer to it. In May 2026 the US average residential price of electricity was 18.44 cents per kilowatt-hour, but the state figures behind that average ran from 12.35 cents in Idaho to 52.00 cents in Hawaii. A four-fold spread means any monthly cost quoted nationally is wrong for almost everybody who reads it. Take the number off your own tariff sheet.

Your utility bills what passes through the meter. Your car reports what reached the battery. The difference is charging losses in the onboard charger, the cabling and the car's own systems, and at Level 2 it is commonly somewhere around ten percent.That is small but it is systematic, and it is why people who check their maths against the bill find the bill slightly higher. Add ten percent to the energy number before you price it and the two reconcile.Charging at very low power makes the gap larger, because the car draws a fixed overhead for the whole session regardless of how fast the energy is arriving. A long Level 1 session pays that overhead for more hours. It is one of the few real, if modest, running-cost arguments for Level 2.

People compute their electricity price by dividing the total on the bill by the kilowatt-hours on the bill. That gives an average, and an average is the wrong number for a new load.Two things push it in opposite directions. Fixed monthly customer charges are spread across your kilowatt-hours in that division, which inflates the average — and the car adds no fixed charges, so the average overstates the car. Meanwhile, under an inclining-block tariff the car's consumption arrives on top of everything else and is billed at the highest tier you reach, which the average understates.The number you want is the price of the next kilowatt-hour under your specific tariff. It is on the rate schedule, which every US utility publishes. Ten minutes with that document beats any calculator.

An EV typically adds somewhere in the region of 250 to 400 kilowatt-hours a month to a household using perhaps 700 to 1,100. That is a large enough increase to move a household across a tier threshold it has never crossed before.In the usual inclining-block arrangement each tier's price applies only to the kilowatt-hours inside that tier, so the effect is that the car's own consumption is priced at your top tier rather than at your comfortable baseline rate. The rest of the bill is untouched. That still means the car's cost per mile can be meaningfully above what your bill average suggests.Check how your tiers are structured, because the wording varies and so does the consequence. If you cross into a higher tier every month once the car arrives, a time-of-use or separately metered EV rate may be worth looking at — but only after you have run the whole-bill comparison, because a whole-house time-of-use rate reprices your afternoons as well as your nights.

Monthly figures feel small enough to ignore. The annual figure is the one that belongs next to the installation cost when you are deciding whether the charger pays for itself.The table below takes 12,000 miles a year at 3.3 miles per kilowatt-hour, adds ten percent for charging losses, and prices the resulting 4,000 kilowatt-hours at the meter.

The installation. A Level 2 charger on an attached garage wall close to the panel commonly runs $800 to $3,000 installed nationally, and there is no federal credit to net against it: Section 30C terminated for property placed in service after June 30, 2026. Whatever your utility offers is the entire incentive layer now.Any change to your fixed charges if switching rates involves a second meter. And demand charges, which appear on a small number of residential tariffs and are billed on your highest short-interval draw rather than on energy.None of that changes the per-mile arithmetic. It changes the payback arithmetic, which is a different page.