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  5. EV Savings Calculator: Gas vs Electric Cost & Payback

EV Savings Calculator

Gas vs Electric Cost & Payback

Inputs

Driving Profile

Unit System

km
years

Gas Vehicle

L / 100 km
$/ L
$/ yr
kg/unit

Electric Vehicle

kWh / 100 km
$/ kWh
$/ yr
kg/kWh

Purchase Comparison

$

Quick Read

EV operating costs are lower with the current assumptions.

Results

Annual Savings

$1,958

Monthly Savings: +$163 · Payback Period: 4.1 yr

Monthly Impact

+$163

Annual result divided into monthly cash flow.

Payback Period

4.1 yr

Years needed to recover the EV purchase premium.

Emissions Avoided

2.00 t CO2

Annual tailpipe-to-grid CO2 difference.

Net After Premium

+$1,788

5 yr ownership window

Annual Cost Comparison

$2,813
$855
Gas Annual Cost
EV Annual Cost

Annual Emissions Comparison

2.95 t CO2
0.94 t CO2
Gas Emissions
EV Emissions
Fuel Cost
$1,913
Charging Cost
$405
Gas Maintenance Annual
$900
EV Maintenance Annual
$450
Net Annual Savings
+$1,958
Ownership Savings
+$9,788
Net After Premium
+$1,788
Payback Period
4.1 yr
Gas Cost
$18.75 / 100 km
EV Cost
$5.70 / 100 km
Fuel Used
1,275.0 L
Electricity Used
2,700 kWh
Emissions Avoided
2.00 t CO2
Savings Rate
69.6%
EV Savings Desk

Compare the whole operating picture, not just fuel

A useful EV comparison separates annual energy cost, maintenance, ownership horizon, purchase premium, and grid emissions. The U.S. DOE/EPA FuelEconomy.gov EV guide is a solid reference for efficiency and EV basics, while this calculator turns those assumptions into annual savings and long-term net after any EV price premium.

"If the EV wins annually but not over your ownership window, the purchase premium is probably the constraint, not charging cost."

Normalize efficiency

Use real-world MPG or L/100km for the gas car and observed kWh/100km or miles/kWh for the EV whenever possible.

Model your charging mix

Home charging, public fast charging, and time-of-use plans can produce very different electricity costs.

Stress-test payback

Try higher electricity rates, lower annual mileage, and a larger EV premium before treating savings as locked in.

Frequently Asked Questions

  • It compares a gas vehicle and an electric vehicle using your annual distance, fuel efficiency, fuel price, EV efficiency, electricity rate, maintenance, ownership years, EV purchase premium, and optional emissions factors. For official EV background, see the U.S. DOE/EPA FuelEconomy.gov EV guide.
  • Fuel savings alone can overstate the result. Adding annual maintenance for both vehicles shows a more realistic running-cost comparison and can materially change payback.
  • The premium is the extra amount paid for the EV versus the comparable gas vehicle. Payback estimates how many years of annual savings are needed to recover that extra upfront cost.
  • Yes. Metric uses kilometers, liters per 100 km, and kWh per 100 km. Imperial uses miles, MPG, and miles per kWh.
  • No. CO2 output depends on fuel type, real-world driving, charging losses, and your electricity grid. The inputs are editable so you can model local assumptions instead of relying on one default.

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