How to use this calculator
Replace the example values with your own measurements or specifications. Keep the units shown beside each label. Results update as you type; reset restores the example.
Use energy measured at the wall so charging losses are included once. A negative savings figure means electricity costs more in your scenario. Purchase price, depreciation, insurance, repairs, charger installation, and incentives are excluded.
The formula
A worked example
For 12,000 miles, a 30 mpg car at $3.50/gallon costs $1,400 in gas. An EV using 30 wall kWh/100 miles at $0.16/kWh costs $576. The energy-only difference is $824.
Common questions
Is this total cost of ownership?
No. It compares energy spending only. Other ownership costs can change the overall comparison.
What if I charge at home and in public?
Use an energy-weighted average rate, or calculate each portion separately and add the costs.
Sources & calculation method
Related guidance: U.S. Department of Energy: EV charging. Accessed September 9, 2026. The equation above describes this tool’s model; the reference provides practical context and does not endorse this site.
Prepared with AI assistance. Formula examples and input validation have automated checks. This page has not received an independent automotive professional review. Read our review standards.