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Free calculator to compare gasoline dollars (MPG × $/gal × miles) to home charging dollars (kWh/mi × miles, adjusted for charger efficiency, × $/kWh). Ideal for understanding fuel-only operating cost before purchase decisions—pair with a full TCO tool for price and maintenance.
Last updated: April 18, 2026
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Use the same mileage total you would put on each vehicle for a fair comparison.
0.90 ≈ 10% loss; wall kWh = vehicle kWh ÷ efficiency.
Gasoline (annual)
$1,500
428.57 gal · $125.00/mo
EV home charging (annual)
$560
4,000 wall kWh · $46.67/mo
Annual savings (gas minus EV home)
$940
EV energy cost is about 62.7% less than gas (energy only).
Cost per 100 miles — gas: $12.50
Cost per 100 miles — EV (home): $4.67
Vehicle kWh/yr: 3,600 kWh (before charger losses)
Planning note
Electric rate
Match your EV schedule
Enter the blended rate that reflects when you actually charge.
Screening
Tune kWh/mi and MPG
Use comparable driving cycles when possible.
Lever
12k–15k+ mi/yr
Annual totals scale linearly with miles in this model.
Efficiency
Typical 85–95%
Lower efficiency increases your utility bill for the same miles.
Next step
Gas vs electric TCO
Pair this fuel screen with purchase and maintenance assumptions.
Bill impact
Retail $/kWh baseline
If you self-consume solar, your marginal rate can differ—adjust $/kWh accordingly.
Approximate annual gas cost vs home charging cost for the same 12,000 miles:
Gas annual
$1,500
EV home annual
$560
Difference (gas − EV)
$940
Gasoline cost uses annual miles divided by MPG to get gallons, then multiplies by dollars per gallon. Home charging cost multiplies annual miles by kWh per mile to get vehicle kWh, converts to wall kWh by dividing by charging efficiency, then multiplies by your retail electricity price. The difference is an annual fuel-energy savings snapshot—not a lease or finance recommendation.
gas_cost = (miles / MPG) × $/galvehicle_kWh = miles × kWh/miwall_kWh = vehicle_kWh / charging_efficiencyev_cost = wall_kWh × $/kWhPer 100 miles: divide each annual cost by miles and multiply by 100.
Home charging uses your utility retail rate for delivered energy
For purchase and maintenance, open the gas vs electric total cost of ownership calculator.
Get a custom calculator for your platformIf your actual kWh/mi or electric rate differs, results move quickly—this example only illustrates the math structure.
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