EV Charging Cost Calculator
Created by: Sophia Bennett. Last updated:
Compare annual home and public charging energy costs using your rates, distance, charging mix and consumption measurement basis.
Compare charging energy costs
Estimate annual energy charges using your driving distance, consumption, electricity rates and home/public charging mix. Example rates are editable assumptions, not current market prices.
Formula
Wall energy = distance × energy consumed per distance, divided by charging efficiency only for battery-side data. Mixed annual cost = wall energy × (home share × home rate + public share × public rate). Monthly cost is annual cost divided by 12.
Example
10,000 miles at 300 Wh/mile measured at the wall uses 3,000 kWh. With rates of 0.12 and 0.30 per kWh and 80% home charging, annual cost is 468 in the chosen currency.
Scope and limitations
Home charging is not always cheaper. Negative home savings mean the home rate is higher. Percentage savings are unavailable if public cost is zero. Currency selection labels entered rates; it does not convert exchange rates.
Use a weighted average rate if your tariff varies by time. Installation, fixed subscriptions, per-session fees, parking and taxes outside the entered rates are excluded. Charging mix is a share of purchased electricity, not a share of charging sessions.
Sources and measurement guidance
- EPA Automotive Trends Report, Appendix E: electricity consumption at the wall includes charging losses.
- EPA eGRID summary data: regional electricity emissions factors. Match the reporting year and CO2 or CO2e measure.
- US Department of Energy: electric vehicle charging.