EV vs. Gas Savings Calculator

EV vs. Gas Savings Calculator compares what two cars actually cost to run and how long an electric vehicle’s higher purchase price takes to pay back. Enter annual mileage, the petrol car’s MPG and fuel price, the EV’s efficiency in miles per kWh and your electricity rate, plus the price premium and any expected maintenance savings. The tool reports annual running cost for each, cost per mile for each, total annual savings, the payback period on the premium and the ten-year net position. Cost per mile is the figure worth watching — it is the honest apples-to-apples comparison, and it usually shows electricity at a third to a quarter of petrol. Because every input is yours, the result reflects your commute and your local rates rather than a manufacturer’s optimistic national average.

Key Features

• Cost Per Mile for Both

  The only truly comparable running-cost metric, since MPG and miles per kWh are not directly comparable units.

• Payback Period on the Premium

  Divides the price premium by annual savings to give a payback in years and months. This is the number that decides the purchase.

• Maintenance Savings Included

  A separate field for reduced servicing, since EVs skip oil changes, exhaust work and most brake wear thanks to regeneration.

• Ten-Year Net Position

  Total savings over a decade minus the premium, giving a lifetime view rather than a single year.

• Fuel and Energy Volumes

  Shows gallons and kWh consumed annually, useful for sanity-checking against your actual bills.

• No Payback Detection

  When savings are zero or negative, the tool says there is no payback rather than showing a misleading infinite figure.

1. 1

   Enter your annual mileage

   Use your real figure from service records. High mileage shortens EV payback dramatically.

2. 2

   Enter the petrol car’s MPG and fuel price

   Use real-world MPG rather than the official rating, and your local pump price.

3. 3

   Enter EV efficiency and electricity rate

   Typical EVs manage 3 to 4 miles per kWh. Use your off-peak home charging rate if you charge overnight.

4. 4

   Enter the price premium

   The difference in purchase price between the two cars, after any incentives or rebates you qualify for.

5. 5

   Read savings and payback

   Check annual savings, payback period and the ten-year net position.

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