Cost Calculator AI
Cars & VehiclesEfficiency & MPGe

EV Range Cost Calculator

Calculate your electric vehicle’s driving cost per mile and per 100 miles of range, calculate road trip costs, and compare against gas car equivalent MPGe.

Calculation Results

EV Range & MPGe Efficiency Formula

Cost per 100 Miles = kWh per 100 Miles × Electricity Rate ($/kWh) | MPGe = (100 / kWh per 100 Miles) × 33.7
  • MPGe Constant: The US EPA defines 1 gallon of gasoline as containing the energy equivalent of 33.7 kilowatt-hours (kWh).
  • Cost per Mile = Cost per 100 Miles / 100.
  • 300-Mile Trip Cost = Cost per Mile × 300.

Step-by-Step Worked Example

Scenario: Calculating cost for a 300-mile road trip in an EV rated at 28 kWh/100mi with electricity at $0.16/kWh

Calculation Steps:

  1. Cost per 100 Miles = 28 kWh × $0.16 = $4.48
  2. Cost per Mile = $4.48 / 100 = $0.0448 (4.48¢ / mile)
  3. Cost for 300-Mile Trip = 300 × $0.0448 = $13.44
  4. Comparison Gas Car (300 miles) = (300 / 28) × $3.50 = $37.50
  5. Net Savings on 300-Mile Trip = $37.50 − $13.44 = $24.06
  6. Equivalent MPGe = (100 / 28) × 33.7 = 120 MPGe
Result: Driving 100 miles costs $4.48 (120 MPGe). A 300-mile road trip costs $13.44, saving $24.06 over a gas car.

How to Use This Calculator

  1. 1Enter your EV efficiency in kWh per 100 miles OR miles per kWh.
  2. 2Specify your average electricity rate ($/kWh).
  3. 3Optionally adjust the comparison gas car MPG and fuel price.
  4. 4Review cost per mile, 300-mile trip cost, and EPA MPGe equivalent.

Assumptions & Limitations

  • High-speed highway cruising (>75 mph) reduces EV range efficiency by approximately 15% to 20% due to aerodynamic drag.

Frequently Asked Questions

What is MPGe and how does it work?

MPGe (Miles Per Gallon equivalent) is the EPA metric comparing electric car energy efficiency to gasoline. Since one gallon of gas contains 33.7 kWh of thermal energy, an electric car that travels 120 miles on 33.7 kWh is rated at 120 MPGe.

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