What you'll pay to charge depends on your local electricity rate and your car's battery size

The amount of electricity your electric car uses is measured in kilowatt-hours (kWh). Most EVs need between 15 and 25 kWh to add 100 miles of range, though this varies by the car's efficiency and the size of its battery. To estimate your charging cost, multiply the kWh your car needs by your local electricity rate — which you can find on your monthly power bill or your utility company's website.

A typical full charge on a mid-size EV like a Tesla Model 3 or Chevy Bolt uses about 50 to 65 kWh. If your electricity costs $0.14 per kWh (the U.S. average, though rates vary widely by region), a full charge costs roughly $7 to $9. In states with higher rates like California or Massachusetts, the same charge might cost $12 to $15. In states with lower rates like Louisiana or Oklahoma, it could be $5 to $7.

Key Takeaways

  • Most electric cars use 15 to 25 kWh per 100 miles of range, so a full charge typically costs $5 to $15 depending on your local electricity rate.
  • Your electricity bill shows your per-kilowatt-hour rate; multiply that by your car's battery size to find your actual charging cost.
  • Charging at home during off-peak hours (usually late evening or early morning) costs less than charging during peak demand times.
  • Public fast chargers cost more per kWh than home charging and often charge by the minute rather than by the amount of electricity used.
  • Larger batteries and less efficient cars use more electricity; comparing EPA efficiency ratings helps you understand what different models will cost to run.

How to find your electricity rate and calculate charging cost

Your utility bill shows your rate in cents per kilowatt-hour, usually labeled as "per kWh" or "electricity rate." Look for this number on your bill or call your utility company's customer service line — they can tell you the rate over the phone in seconds. Some utilities also post rates on their website under "rates" or "pricing."

Once you have the rate, check your car's battery size in the owner's manual or the manufacturer's website. It will be listed in kWh — for example, a Tesla Model 3 Standard Range has a 54 kWh usable battery, while a Chevy Equinox EV has a 85 kWh battery. Multiply the battery size by your electricity rate to get the cost of a full charge from empty to full.

Keep in mind that charging from 0 to 100 percent is rare in real life. Most owners charge when the battery drops to 20 or 30 percent and stop at 80 percent to preserve battery health. A charge from 20 to 80 percent uses about 60 percent of the battery's total capacity, so adjust your math accordingly if you want to know what you actually spend per week or month.

Why charging at home costs less than public chargers

Home charging uses your residential electricity rate, which is almost always cheaper than public charging networks. Public fast chargers (DC fast chargers) cost more per kWh and often add a session fee or charge by the minute instead of by the amount of electricity delivered. A DC fast charge that costs $10 to $15 at a public station might cost $3 to $5 at home.

Level 2 chargers at workplaces, shopping centers, or apartment buildings fall in the middle. Some are free, some charge a flat fee per session, and some charge per kWh. If you have access to free or low-cost Level 2 charging during the day, your overall electricity costs drop significantly because you use less home charging.

Time of use also matters. Many utilities offer lower rates during off-peak hours — typically 9 p.m. to 6 a.m. or midnight to 5 a.m. If your utility offers this rate and your car can be programmed to charge during those hours, you can cut your charging cost by 20 to 40 percent compared to charging during peak hours.

How car efficiency affects electricity use

Not all electric cars use electricity at the same rate. The EPA rates EV efficiency in miles per kilowatt-hour (miles/kWh) or kilowatt-hours per 100 miles (kWh/100 mi). A more efficient car uses fewer kWh to travel the same distance, which means lower electricity costs.

For example, a Tesla Model 3 Standard Range is rated at about 24 miles per kWh, while a Hummer EV is rated at about 12 miles per kWh. To drive 300 miles, the Model 3 needs about 12.5 kWh, while the Hummer needs about 25 kWh. At $0.14 per kWh, that's a difference of about $1.75 for the same distance. Over a year of typical driving, efficiency differences add up.

Driving conditions also affect real-world efficiency. Cold weather, highway driving, and aggressive acceleration all reduce range and increase electricity use. City driving, mild weather, and steady speeds improve efficiency. Your actual cost per mile will vary from the EPA estimate, but the EPA rating gives you a reliable way to compare different models.

Comparing the cost of charging versus gasoline

Electric cars cost less to fuel than gasoline cars in most of the United States. At $0.14 per kWh, charging an efficient EV costs roughly $0.04 to $0.06 per mile. A gasoline car averaging 25 miles per gallon costs about $0.10 to $0.15 per mile when gas is $3 to $4 per gallon. The savings are larger in states with cheaper electricity and smaller in states with expensive electricity or cheap gas.

This comparison assumes you charge at home. Public fast charging narrows or eliminates the savings, so if you rely on public chargers for most of your driving, the cost advantage shrinks. However, most EV owners charge at home overnight and use public chargers only for long trips, so home charging costs dominate their total fuel expense.

What affects your total electricity bill when you own an EV

Adding an EV to your home increases your monthly electricity use, but the amount depends on how much you drive and how efficient your car is. An EV driven 12,000 miles per year (the U.S. average) uses roughly 500 to 800 kWh per year for charging, depending on efficiency. At $0.14 per kWh, that adds about $70 to $110 per year to your electricity bill.

Some utilities charge higher rates for high-volume users or have demand charges that increase your bill if you charge during peak hours. If your utility has time-of-use rates, you can reduce this impact by charging during off-peak hours. A few utilities offer special EV rates that are lower than standard residential rates, so it's worth asking your utility whether they have one.

If you install a Level 2 home charger, there may be an upfront cost ($500 to $2,000 depending on your electrical setup), but no ongoing fees beyond the electricity itself. Some states and utilities offer rebates for charger installation, which can offset part of the cost.

Frequently Asked Questions

How much does it cost to charge an electric car overnight at home?

A full overnight charge on a typical EV costs $5 to $15, depending on your local electricity rate and your car's battery size. If you charge from 20 to 80 percent (the typical range), the cost is roughly $3 to $10. Check your electricity bill for your per-kWh rate and multiply it by your car's battery capacity to get your exact cost.

Is it cheaper to charge at home or at a public charger?

Home charging is almost always cheaper. Public DC fast chargers typically cost $0.25 to $0.50 per kWh plus session fees, while home charging costs $0.10 to $0.20 per kWh depending on your utility rate. Level 2 public chargers are cheaper than DC fast chargers but still usually cost more than home charging.

Does charging an electric car increase my electricity bill a lot?

For typical driving (12,000 miles per year), charging adds $70 to $150 per year to your electricity bill in most states. This is much less than the cost of gasoline for the same distance. If you drive more or have expensive electricity, the increase will be higher.

Why do some cars use more electricity than others?

Larger cars, heavier cars, and less aerodynamic designs use more electricity per mile. The EPA efficiency rating (miles per kWh) tells you how much electricity a specific model needs. Driving conditions like cold weather, highway speeds, and aggressive acceleration also increase electricity use.

Can I save money by charging during certain times of day?

Yes, if your utility offers time-of-use rates. Off-peak hours (usually late evening or early morning) cost 20 to 40 percent less than peak hours. If your car can be programmed to charge during off-peak times, you can reduce your charging cost significantly. Check your utility bill or website to see if this rate is available in your area.