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In many cases, charging an electric car costs less than fueling a gasoline car, especially when the vehicle is charged at home and electricity rates are moderate. But the comparison depends on more than the price displayed at a charger or gas pump. Vehicle efficiency, local energy prices, charging habits, and public charging fees all affect the result. A per-mile calculation provides a practical way to compare costs and estimate what an electric car could save in everyday driving.

Electricity Versus Gas: The Basic Cost Comparison

Electric cars use electricity measured in kilowatt-hours (kWh), while gasoline vehicles use fuel measured in gallons. To compare them fairly, calculate the cost to travel the same distance—not simply the cost of one kWh versus one gallon.

A useful estimate is the cost per 100 miles. For an electric car, multiply its electricity use in kWh per 100 miles by the price per kWh. For a gasoline car, divide 100 miles by its miles-per-gallon rating, then multiply the gallons used by the local price of gas.

For example, consider an electric car that uses 30 kWh per 100 miles and a gasoline car that gets 30 miles per gallon. If electricity costs 16 cents per kWh and gasoline costs $3.50 per gallon:

• Electric car: 30 kWh × $0.16 = $4.80 per 100 miles.
• Gasoline car: 100 ÷ 30 = 3.33 gallons; 3.33 × $3.50 = about $11.67 per 100 miles.

Under those assumptions, the electric car costs about $6.87 less per 100 miles for energy. The exact difference changes with local prices and the efficiency of the vehicles being compared.

How to Calculate Charging Costs

An electric car’s energy use is commonly listed in kWh per 100 miles. A lower figure means the car needs less electricity to travel that distance. The U.S. Environmental Protection Agency (EPA) publishes vehicle efficiency information, including energy consumption and estimated annual fuel costs, in its fuel economy database.

To estimate the cost of a full charge, multiply the battery capacity in kWh by the electricity rate. A 60-kWh battery charged at 16 cents per kWh would cost $9.60 in a simplified calculation. In practice, drivers may not charge from empty to full, and charging losses can mean the electricity drawn from the outlet exceeds the energy stored in the battery.

For a more realistic estimate, use the vehicle’s measured or EPA-rated electricity consumption and the rate on the utility bill. Residential electricity bills may include delivery charges, time-of-use pricing, taxes, or other fees. The marginal cost of charging can therefore differ from a headline supply rate. A smart meter, utility account, or charging app may help identify the applicable price.

Home Charging Often Offers the Lowest Cost

Home charging is usually the least expensive and most convenient option for drivers who can charge where they park. The U.S. Department of Energy’s Alternative Fuels Data Center explains that charging costs vary by location and charging level. Residential rates are often lower than public fast-charging prices, though local electricity prices vary widely.

Drivers with time-of-use electricity plans may pay less during designated off-peak hours, often overnight. The savings depend on the utility’s schedule and rates, so it is worth checking the plan before setting a charging timer. Some utilities offer special electric-vehicle rates or rebates for home charging equipment, but availability and eligibility differ by service area.

Installing a Level 2 home charger can add an upfront expense. The total depends on the charger, electrical-panel capacity, wiring distance, permits, and local labor rates. Some households can use a standard household outlet for slower Level 1 charging, while others need Level 2 charging to replenish more energy in a limited time. Installation costs should be considered when evaluating total ownership expenses, rather than treated as part of every charging session.

Public Charging Can Change the Math

Public charging prices range from free or relatively inexpensive destination charging to higher-priced DC fast charging. Prices may be listed per kWh, per minute, or as a session fee, depending on the network and location. Some stations also charge idle fees if a vehicle remains connected after charging ends. The charging app or station screen should be checked before a session begins.

Fast charging is useful for road trips and quick stops, but it is not always the cheapest way to power a car. Rates can be higher than residential electricity prices, and charging speed may slow as a battery approaches full. A driver who relies heavily on costly fast charging may see a smaller energy-cost advantage than someone who charges mainly at home.

Some apartments, workplaces, hotels, and shopping centers provide charging. Workplace or destination charging can reduce the need for home installation, although access, pricing, and availability vary. Free charging can lower a driver’s out-of-pocket energy costs, but it should not be assumed to remain free or to be available whenever needed.

What Determines the Cost of Charging an Electric Car?

Vehicle Efficiency

Electric cars differ in energy use. A smaller, more aerodynamic model may travel farther on each kWh than a larger vehicle with a heavier body, all-wheel drive, or less efficient tires. EPA ratings provide a consistent starting point, but real-world results can vary with speed, temperature, terrain, cargo, and driving style.

Electricity Rates and Charging Time

Electricity prices vary by state, utility, and rate plan. A driver paying 10 cents per kWh will generally spend less than one paying 30 cents per kWh for the same energy. Time-of-use rates can make the time of charging financially important, while peak demand or special fees may affect some commercial charging sites.

Weather and Driving Conditions

Cold weather can reduce battery efficiency because the vehicle may use energy to warm the cabin and battery. Heat, high speeds, hills, stop-and-go traffic, and frequent use of climate controls can also affect consumption. Gasoline vehicles’ efficiency changes with conditions too, so a fair comparison uses realistic driving patterns for both vehicles.

Charging Losses

Not all electricity drawn from a home outlet or charging station reaches the battery. Some energy is lost during charging and conversion. Estimates based only on battery capacity can therefore understate the amount billed. For an accurate household estimate, compare the charger’s reported energy use or the utility meter’s usage with the vehicle’s mileage over time.

Example Costs at Different Energy Prices

The table below compares a hypothetical electric car using 30 kWh per 100 miles with a hypothetical gasoline car averaging 30 mpg. It is an illustration, not a forecast of current prices. Actual rates and vehicle efficiency differ by region and model.

This comparison shows why the answer is location-specific. At high electricity prices, an inefficient electric vehicle charged mostly at expensive public stations may cost as much as—or more than—a fuel-efficient gasoline car for energy. A highly efficient electric car or a driver with low-cost home charging can have a substantial advantage.

Annual Energy Savings: A Worked Example

Suppose a driver travels 12,000 miles annually. At the example rates above, the electric car costs $4.80 per 100 miles, or about $576 per year for energy. The gasoline car costs about $11.67 per 100 miles, or roughly $1,400 per year for fuel. The estimated difference is about $824 annually.

That estimate assumes the cars achieve the stated efficiency in real use and that all electric charging is billed at 16 cents per kWh. It excludes charging losses, public charging premiums, taxes, and changes in energy prices. If the electric car is charged at a higher average rate, or the gasoline car is more efficient than 30 mpg, the savings shrink. If gas prices rise or home charging rates are lower, they may grow.

Energy Costs Are Not the Same as Total Ownership Costs

Cheaper energy does not automatically mean a lower overall cost to own an electric car. Purchase price, financing, insurance, depreciation, registration, maintenance, and home-charger installation can influence the total. Federal, state, and local incentives may change the purchase calculation, but programs and eligibility rules can change; buyers should verify current details through official government sources.

Electric cars generally have fewer routine powertrain service needs because they do not require engine oil changes and have fewer conventional engine components. However, tires, brakes, suspension, cabin filters, and other items still need attention. Tire wear can depend on vehicle weight, torque, tires, and driving habits. Battery repairs are uncommon for many owners but may be costly outside warranty coverage. Maintenance savings should be evaluated using model-specific information rather than assumed to be identical for every vehicle.

For a full comparison, calculate both annual energy costs and expected ownership expenses over the period the vehicle will be kept. The EPA’s fuel economy tools and the Department of Energy’s Alternative Fuels Data Center provide useful starting points for vehicle efficiency and charging information.

How to Find the Break-Even Point

A simple break-even check compares the cost per mile for each vehicle. The electric car’s cost per mile is its kWh per mile multiplied by the electricity price. The gasoline car’s cost per mile is the price per gallon divided by miles per gallon. If charging is split between home and public stations, use a weighted average electricity price based on how much energy comes from each source.

1. Find each vehicle’s efficiency rating from the EPA or the manufacturer’s specifications.
2. Check the actual residential electricity rate, including relevant charges and time-of-use periods.
3. Review public charger prices along common routes and account for likely charging frequency.
4. Use local gas prices and the expected fuel economy of the gasoline vehicle.
5. Multiply each cost per mile by expected annual mileage to estimate yearly energy expenses.

For example, if an electric car costs 5 cents per mile to charge and a gasoline car costs 12 cents per mile to fuel, the energy-cost difference is 7 cents per mile. At 12,000 miles annually, that equals an estimated $840 in annual savings before other ownership costs.

So, Is It Cheaper to Charge an Electric Car Than to Buy Gas?

Often, yes—particularly when charging at home at a moderate or low electricity rate. Electric cars can cost much less per mile to power than comparable gasoline vehicles under common price assumptions. The advantage is less certain for drivers who depend on expensive public fast charging, live where electricity is costly, or compare an inefficient electric vehicle with a very fuel-efficient gas car.

The most reliable answer comes from local numbers: the specific vehicles’ efficiency, the driver’s utility rate, public charging costs, and annual mileage. A short per-100-mile calculation can reveal whether charging is likely to save money, while a broader ownership-cost comparison shows whether the vehicle is affordable overall.

Sources for Checking Current Costs

• U.S. Department of Energy and EPA FuelEconomy.gov — vehicle efficiency ratings, fuel-cost estimates, and model comparisons.
• U.S. Department of Energy Alternative Fuels Data Center — electric-vehicle charging basics and infrastructure information.
• U.S. Energy Information Administration — electricity data and information about U.S. energy prices.
• U.S. Energy Information Administration — gasoline and diesel price data.