EV Charging Cost Calculator
Compare what it actually costs to charge an electric vehicle at home against an equivalent gas vehicle, using your own electricity rate and driving.
From the window sticker or your own tracked average.
Wall-to-battery loss — 85-90% is typical for AC home charging.
Comparison gas vehicle
The comparison people actually want: cents per mile, not sticker price
EV cost-of-ownership conversations tend to focus on the vehicle’s purchase price, but the recurring cost that compounds every single mile driven is the “fuel” cost — electricity for an EV, gasoline for a comparable conventional vehicle — and that comparison is where EVs most consistently show a real, ongoing savings. This calculator converts your actual driving, vehicle efficiency and local electricity rate into an annual charging cost and a cost-per-mile figure, set directly against an equivalent gas vehicle’s cost at your local gas price, so the comparison uses your actual numbers rather than a generic national average.
Why charging efficiency isn’t just a rounding error
A meaningful share of the electricity your home draws to charge an EV doesn’t end up as usable energy in the battery — some is lost as heat during the conversion from AC household power to the DC the battery stores, typically putting home charging efficiency somewhere around 85-90% for standard Level 1 or Level 2 charging. Skipping this adjustment and simply dividing miles by the vehicle’s rated efficiency understates real cost by that same 10-15% margin, which adds up over a full year of charging. Different charging equipment and conditions shift this figure somewhat, but building it into the calculation, as this tool does, gets meaningfully closer to what actually shows up on the electric bill than ignoring it entirely.
Home charging versus public fast charging: a real cost gap
The comparison this calculator runs assumes home charging, which is both the most common way EV owners actually charge and, for most households, meaningfully cheaper per kWh than public DC fast charging. Fast chargers carry their own cost structure — expensive high-power hardware, real estate, and a premium for charging speed and convenience — that gets reflected in a per-kWh or per-minute rate often well above typical residential electricity prices. For most owners, home charging overnight covers the large majority of actual charging needs, with public fast charging reserved for road trips or households without home charging access; if your usage leans heavily on public fast charging, your real-world cost will run higher than this calculator’s home-rate-based estimate.
Time-of-use rates: a lever worth checking
Many electric utilities offer, or in some regions require, time-of-use rate plans that charge significantly less for electricity during off-peak hours — typically overnight — specifically to spread out demand and encourage flexible loads like EV charging into low-demand windows. If your utility offers this and your EV or charging equipment supports scheduled charging, switching to a time-of-use plan and charging overnight can meaningfully lower the effective electricity rate this calculator uses, without any change in driving behavior. It’s worth checking with your utility specifically, since not every provider offers this and the savings structure varies.
What determines whether an EV actually saves money on fuel
The gap between EV and gas cost per mile depends on the ratio between local electricity and gas prices as much as it depends on either vehicle’s raw efficiency — a region with cheap electricity and expensive gas shows a large EV advantage, while a region with expensive electricity and cheap gas narrows or can even reverse that gap. Run this calculator with your actual local rates rather than assuming a fixed national savings figure, since the underlying economics genuinely differ by region. See the fuel economy calculator for the gas-vehicle side of a broader vehicle comparison, and the energy cost calculator for placing EV charging cost inside your overall household utility budget.
How this is calculated
kWh per year = miles ÷ efficiency (mi/kWh) ÷ charging efficiency Annual charging cost = kWh per year × electricity rate
Frequently asked questions
- How much does it cost to charge an EV at home?
- It depends on your electricity rate and the vehicle's efficiency, but a common estimate is 3-4 miles per kWh, so a vehicle driven 12,000 miles a year at a $0.16/kWh rate lands around a few hundred dollars annually — meaningfully less than an equivalent gas vehicle's fuel cost in most parts of the country, though the exact gap depends heavily on local electricity and gas prices.
- Why does charging efficiency matter?
- Not all electricity drawn from the wall makes it into the battery as usable energy — some is lost as heat during the AC-to-DC conversion process, typically putting home Level 1/2 charging around 85-90% efficient. Ignoring this loss understates actual charging cost by a meaningful margin, which is why this calculator applies it explicitly rather than assuming perfect efficiency.
- Is charging at a public DC fast charger more expensive than at home?
- Usually yes, often substantially — public fast chargers typically charge a per-kWh or per-minute rate well above typical residential electricity rates, reflecting the cost of the high-power hardware and the convenience of fast charging. Home charging overnight is the cheapest way to charge for most EV owners; public fast charging is best reserved for road trips or when home charging isn't available.
- Does EV charging cost vary by time of day?
- For households on a time-of-use electricity rate plan, yes — many utilities charge significantly less for electricity during off-peak overnight hours specifically to encourage EV charging and other flexible loads during low-demand periods. Check whether your utility offers a time-of-use or EV-specific rate plan, since scheduling charging overnight can meaningfully lower the effective rate used in this calculator.