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EV vs Petrol Cost Calculator

Work out ev vs petrol cost instantly with clear inputs, formula shown and shareable results.

About EV vs Petrol Cost Calculator

EV energy cost is consumption times electricity price, and the comparison hinges entirely on the tariff: home overnight rates can be a fifth of public rapid charging prices. At 17 kWh/100km and a 28p tariff the EV costs about 4.76 per 100 km against 11.50 for petrol.

Formula

EV versus petrol

EV cost per 100 km = kWh/100km x electricity price; compare with fuel cost per 100 km

Worked example

With the default values below, EV vs Petrol Cost Calculator returns Annual saving with the EV of $1,011.00. Change any input above and every figure here is recalculated in your browser.

Inputs used

Annual distance
15,000 km
EV consumption
17 kWh/100km
Electricity price
0.28
Petrol cost per 100 km
11.5

Results

Annual saving with the EV
$1,011.00
EV annual energy cost
$714.00
Petrol annual fuel cost
$1,725.00
EV cost per 100 km
$4.76

Step by step

  1. 1Values used
  2. 2EV versus petrol
  3. 3Annual saving with the EV= 1,011.00
  4. 4EV annual energy cost= 714.00
  5. 5Petrol annual fuel cost= 1,725.00
  6. 6EV cost per 100 km= 4.76

Assumptions and limits

  • The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation or tax into account.
  • Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

Does rapid charging change the answer?

Substantially. At 70-80p per kWh a rapid charger costs more per kilometre than petrol in an efficient car, so home charging is what makes the economics work.

What about total cost of ownership?

Add higher purchase price and insurance against lower servicing and tax. Over five years the balance depends heavily on annual mileage.

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