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Gas vs EV Savings Calculator

See how much you'd save by going electric.

How it is calculated

The tool prices a year of driving twice. Gas: gas cost = miles ÷ mpg × gas price per gallon. Electric: EV cost = miles × kWh per mile × price per kWh. Savings are the difference: savings = gas cost − EV cost. Note that the EV efficiency is entered as kWh used per mile (for example 0.3), not as miles per kWh and not per 100 miles, and distance is in miles with fuel in US gallons. Money is in dollars and rounded to cents. MPG must be above zero, and miles, gas price, kWh per mile and electricity price cannot be negative; otherwise no result is shown. If the EV turns out more expensive to run than the gas car, for example with very costly public charging, the savings appear as a negative number. Only fuel and electricity are compared; insurance, maintenance, purchase price and charger installation are not part of the result.

Worked example

Take 12000 miles a year, a gas car at 28 mpg with gas at $3.50 a gallon, and an EV using 0.3 kWh per mile with electricity at $0.15 per kWh. Gas: 12000 ÷ 28 = 428.57 gallons, times $3.50 = $1,500.00. EV: 12000 × 0.3 = 3600 kWh, times $0.15 = $540.00. Savings: 1500 − 540 = $960.00 a year, which is about $80 a month in fuel alone.

Try this example →

Common mistakes

  • Typing the EV's miles per kWh (such as 3.3) into the kWh per mile field. That would make the electricity cost about eleven times too high; use its inverse, 0.3.
  • Entering kWh per 100 miles (30) instead of kWh per mile (0.3), which inflates EV cost a hundredfold.
  • Entering kilometres or litres. The tool expects miles, miles per gallon and a price per gallon, so convert first.
  • Using the home electricity rate when much of the charging is at public fast chargers that cost more per kWh.
  • Reading the result as total savings. It ignores the EV's higher price, insurance and maintenance, so it is not a full payback calculation.

About this calculator

Comparing a gas car to an EV comes down to two very different cost-per-mile formulas: gas cost = (annual miles ÷ MPG) × price per gallon, while EV cost = annual miles × kWh per mile × price per kWh. Because electricity is typically far cheaper per mile of range than gasoline — often by a factor of three or four — the annual fuel savings from switching can be substantial even before accounting for an EV’s lower maintenance costs (no oil changes, fewer moving parts, and regenerative braking that extends brake pad life).

Car shoppers run this comparison to see how quickly fuel savings alone might offset an EV’s typically higher purchase price, and the answer depends heavily on driving habits — someone who drives 25,000 miles a year and does mostly around-town driving (where EVs are especially efficient thanks to regenerative braking) sees a much bigger gap than someone who drives rarely. Utility companies and EV advocacy groups also publish versions of this calculation to help households estimate the real-world payback period of switching.

Efficiency must be in kWh per mile, so a kWh-per-100-miles figure needs dividing by 100 first.

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