Comprehensive Guide
Learn more in our Personal Finance Guide.
How it works
An EV-versus-gas calculator answers the question sticker prices obscure: when does the cheaper-to-run car pay for being more expensive to buy? It compares each car's full running cost - energy plus routine maintenance - across your actual mileage. The gas side divides miles by MPG and multiplies by the pump price; the EV side divides the same miles by efficiency in miles per kWh and multiplies by your electricity rate, then layers on maintenance, where electric drivetrains genuinely win: no oil changes, fewer brake jobs thanks to regenerative braking, no exhaust or transmission service. At typical inputs - 12,000 miles, a 30-MPG gas car at $3.45, an EV at 3.5 miles per kWh charging at 16 cents - the gas car runs about $2,580 a year against roughly $1,270, saving around $1,310 annually. The calculator then sets those savings against the purchase-price premium net of incentives to find break-even: a $10,000 premium takes about 7.6 years here, which is why the honest answer swings on home-charging access, local rates and how long you keep cars. Run your own numbers before joining either camp - public fast charging is seldom cheap, and expensive home electricity erases much of the advantage.Formula
Break-even years = (EV price - incentives - gas car price) / annual operating savings
Tips
- Charge at home if at all possible - DC fast charging can double or triple the per-kWh cost.
- Verify incentive eligibility yourself; income caps and model lists change regularly.
- Cold weather cuts EV range 20-30% - size the battery for your worst season.
- Insure both candidates before deciding; EV policies often price higher.
- The longer you keep the car, the better the EV math looks - break-even is a floor, not a finish line.
Frequently asked questions
Are EVs cheaper than gas cars overall?
Usually cheaper to run, often dearer to buy - so the answer depends on how many years of operating savings the premium must repay. At average US energy prices an EV saves $1,000-$1,500 a year at 12,000 miles; whether that beats the price gap is exactly what the break-even line above computes.
How long does it take an EV to break even?
Anywhere from immediately (cheap used EV, big rebate) to never (high local electricity rates, cheap gas, small mileage). With a $10,000 premium and $1,300 of annual savings, expect around 7-8 years. Drive more miles and the clock speeds up proportionally.
How much does it cost to charge an EV at home?
Miles divided by efficiency, times your utility rate. Twelve thousand miles at 3.5 miles per kWh needs about 3,430 kWh - roughly $550 a year at 16 cents per kWh, or about $46 a month added to the electric bill.
Do electric cars really save on maintenance?
Yes, meaningfully but modestly: no oil changes, spark plugs or transmission service, and regenerative braking stretches brake life for years. Industry estimates put EV upkeep around 40% below comparable gas cars - real money, though tires and software subscriptions can claw some back.
Is public fast charging expensive?
Often 2-3 times residential rates per kWh, which can push the energy cost near gasoline parity. Occasional road-trip use barely dents the math; relying on fast chargers as your main supply changes it substantially. Home charging is the assumption this comparison stands on.