How do I calculate EV cost per mile?

Divide your electricity price by your efficiency: dollars per kWh divided by miles per kWh. For example, $0.17/kWh at 3.5 mi/kWh is about 4.9 cents per mile. Use the price you actually pay and your car's real mi/kWh for an accurate figure.

Is it cheaper to charge an EV at home or at a public station?

Home is much cheaper. The US average home rate is about $0.17/kWh, while public DC fast-charging averages roughly $0.48/kWh, close to three times as much. That means the same EV can cost about 4.9 cents per mile at home but around 13.7 cents per mile on a fast-charger.

Does a bigger battery make an EV cheaper to drive per mile?

No. Battery size affects how far you can go between charges, not the cost of each mile. Cost per mile depends only on your electricity price and your efficiency (mi/kWh), so a more efficient car is cheaper to run even with a smaller battery.

Is an EV always cheaper per mile than a gas car?

Not always. Home-charged, most EVs beat even a 40-mpg gas car. But an inefficient EV relying on public fast-charging can cost more per mile than a 20-mpg truck on gas. Your charging mix and efficiency decide the outcome, so it's worth running your own numbers.

EV Charging Cost Per Mile, Explained

Your EV cost per mile is one short division: the price you pay per kilowatt-hour divided by how many miles the car goes on a kWh. That's it. If you charge at home for about $0.17/kWh and your EV does 3.5 mi/kWh, you're spending roughly $0.17 ÷ 3.5 = about 4.9 cents per mile. Fill in your own two numbers and you have a real answer instead of a guess.

The formula, and why it's the right one

Cost per mile for any vehicle is the same idea: price per unit of energy divided by how far that unit takes you. For gas, that's dollars per gallon divided by miles per gallon. For an EV, it's dollars per kWh divided by miles per kWh (mi/kWh). The higher your mi/kWh, the cheaper every mile gets, exactly the way higher mpg makes a gas car cheaper to drive.

Two numbers do all the work: your electricity price and your efficiency. Everything else (battery size, range on a full charge, how big the car is) matters for convenience and up-front cost, but not directly for the cost of a single mile. That surprises people, so it's worth sitting with. A bigger battery lets you drive farther between plug-ins; it does not make each mile cheaper. If you want a deeper look at that second number, see EV efficiency explained.

Worked examples at home (~$0.17/kWh)

Most EV driving happens on home charging, so start there. Using the US average of about $0.17/kWh, here's what different efficiencies cost per mile:

4.0 mi/kWh (very efficient): $0.17 ÷ 4.0 = about 4.2 cents/mile
3.5 mi/kWh (typical good): $0.17 ÷ 3.5 = about 4.9 cents/mile
3.0 mi/kWh (average): $0.17 ÷ 3.0 = about 5.7 cents/mile
2.0 mi/kWh (big truck/SUV, cold weather): $0.17 ÷ 2.0 = about 8.5 cents/mile

Notice the spread. The efficient car costs roughly half as much per mile as the thirsty one, on the exact same electricity. That gap is the whole reason efficiency matters more than battery size for your running cost. Your local electricity rate shifts every row up or down, so plug your own $/kWh in; our fuller walkthrough of how much it costs to charge an EV covers reading that number off your bill.

Public DC fast-charging changes the math (~$0.48/kWh)

Now run the same cars at a public fast-charger, where the US average is roughly $0.48/kWh, close to three times the home rate:

4.0 mi/kWh: $0.48 ÷ 4.0 = about 12.0 cents/mile
3.5 mi/kWh: $0.48 ÷ 3.5 = about 13.7 cents/mile
3.0 mi/kWh: $0.48 ÷ 3.0 = about 16.0 cents/mile
2.0 mi/kWh: $0.48 ÷ 2.0 = about 24.0 cents/mile

This is the honest caveat nobody's ad-choked calculator wants to show you: leaning on public DC fast-charging narrows, and can erase, the savings that make an EV cheap to run. An efficient EV that costs about 4.2 cents/mile at home costs closer to 12 cents/mile on the road. If you can't charge at home and you'd rely mostly on public chargers, the running-cost case for an EV gets much weaker, so be realistic about your charging mix before you decide.

How that compares to gas (~$3.30/gal)

Put gas on the same cents-per-mile scale, at the US average of about $3.30/gal:

20 mpg (large SUV/truck): $3.30 ÷ 20 = about 16.5 cents/mile
30 mpg (typical car): $3.30 ÷ 30 = about 11.0 cents/mile
40 mpg (efficient/hybrid): $3.30 ÷ 40 = about 8.2 cents/mile

Line them up and the pattern is clear. Home-charged at 3.5 mi/kWh (~4.9 cents/mile), an EV runs cheaper than even a 40-mpg gas car. But an EV pushed to 2 mi/kWh on public fast-charging (~24 cents/mile) is more expensive per mile than a 20-mpg truck on gas. The car type matters, and so does where you charge. There's also a maintenance edge worth naming: EVs tend to save roughly $0.03/mile on upkeep (no oil changes, less brake wear), which quietly widens the home-charging gap.

Turning cents into real dollars

Cents per mile feels abstract until you multiply by your mileage. A typical driver covers about 12,000 miles a year. At ~4.9 cents/mile that's roughly $590 in "fuel"; at ~11 cents/mile for a 30-mpg gas car it's about $1,320, a difference of around $730 a year for the same driver. Your real numbers depend on your rate, your efficiency, and your charging mix, which is exactly why it pays to run your own case rather than trust a round-number headline. One more note on the sticker side: the federal $7,500 EV tax credit ended September 30, 2025, so don't factor it in, though some state or utility incentives may still exist where you live and are worth checking.

The fastest way to see your own answer is to plug your electricity price, efficiency, and mileage into the gas-vs-EV calculator. If you want concrete cars to compare, we've run the same math on the Tesla Model 3 and the Chevy Bolt so you can see how efficiency plays out on real vehicles.