EV vs Gas Car Calculator United States

With an electric car you buy kilowatt-hours from the grid instead of gallons at the pump. Whether that saves money depends on how far you drive, how efficient your current car is, and what gas and electricity cost. This EV vs gas calculator shows your gas car’s yearly fuel bill, an electric car’s yearly charging bill, and the difference.

How the EV vs gas calculator works

For the gas car, the calculator divides your annual miles by the car’s miles per gallon to get gallons used, then multiplies by the price per gallon. For the electric car, it divides the same miles by the EV’s miles per kWh to get kilowatt-hours used, then multiplies by your electricity price. The gas total minus the electric total is the annual saving. Both sides use the same mileage, so you are pricing the same distance two ways.

Choosing realistic inputs

The defaults describe a fairly average American driver: 12,000 miles a year, a 25 MPG car, gas at $3.50 a gallon, an EV at 3.5 miles per kWh, and electricity at 15 cents per kWh. Annual mileage has the largest effect: a high-mileage commuter saves far more than an occasional driver. Gas mileage is close behind: replacing a 15 MPG truck saves much more than replacing a 40 MPG hatchback. The two advanced inputs set the EV’s efficiency and your actual electricity rate.

A worked example

A 25 MPG car driven 12,000 miles a year uses 480 gallons, $1,680 at $3.50 a gallon. An EV at 3.5 miles per kWh uses about 3,429 kWh for the same miles, roughly $514 at 15 cents. The annual saving is about $1,166. At 20,000 miles a year the saving grows to nearly $2,000, so heavy drivers recover an EV’s higher purchase price much sooner.

At 6,000 miles a year the saving falls to about $583, half the default. If the EV costs several thousand dollars more, a low-mileage driver may take many years to break even on fuel alone.

Where you charge

The electricity rate moves the EV bill more than any other input, and it varies from driver to driver. A household on an overnight or time-of-use EV plan might pay 10 to 12 cents per kWh. A driver relying on public DC fast chargers can pay 40 to 60 cents per kWh, which narrows or erases the saving. If you split your charging, enter a blended rate weighted toward where you plug in most. The EV advantage is largest for drivers who can charge cheaply at home.

What the calculator includes

The tool covers the cost of energy to drive a given distance, usually the largest and most predictable running-cost difference between the two cars. It does not model purchase price, financing, depreciation, insurance or maintenance, although EVs tend to cost less to maintain: fewer moving parts, no oil changes, and less brake wear thanks to regenerative braking. It also applies no tax credits or rebates. Weigh the annual fuel saving against the price difference and incentives over the years you expect to own the car.

Common mistakes to avoid

Pricing the EV at a home charging rate while planning to rely on expensive public chargers makes the EV look better than it is. Deciding on fuel alone ignores the purchase price gap, incentives and resale value, which can outweigh it either way. And EPA efficiency ratings assume mild weather and gentle driving; cold winters, highway speeds and heavy loads cut real miles per kWh, so a slightly conservative figure gives a more realistic saving.

Assumptions and limitations

The calculator assumes steady prices and efficiency all year. In practice cold weather reduces EV range and adds heating load, highway speeds lower both MPG and miles per kWh, and gas and electricity prices change. It also assumes one electricity rate, so use a blended figure if you split charging between home and public chargers. Revisit the estimate when your prices or driving change.

About This EV vs Gas Calculator

Use this EV vs gas calculator to get an instant estimate based on the figures you enter. Adjust the inputs above to match your situation, or browse all our calculators to plan your next step.