EV Charging Cost Per Mile
Calculate the cost per mile to charge an electric vehicle from efficiency and electricity price.
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What this tool does
This calculator computes the cost per mile to charge an electric vehicle using the simple division formula: cost per mile = electricity price per kWh ÷ vehicle efficiency in miles per kWh. Inputs are EV efficiency (mi/kWh) and electricity price per kWh; the output is cost per mile. The tool also displays cost per 100 miles and per 1,000 miles.
How EV Charging Cost Per Mile works
This tool divides the electricity price per kilowatt-hour by the vehicle's stated efficiency to produce a cost per mile. If a car travels 3.5 miles on one kWh and electricity costs 0.28 per kWh, each mile costs 0.08. The calculator extends this to 100-mile and 1,000-mile totals for trip planning.
The formula
Cost per mile = Price per kWh ÷ Efficiency (mi/kWh)
Every variable is user-supplied; no embedded regional tariffs or vehicle database lookups are involved.
Where this method is most accurate
The result reflects charging cost only—metered electricity delivered to the vehicle. Real-world efficiency varies with speed, temperature, terrain, cabin heating, and battery age. Manufacturer-quoted mi/kWh figures are often derived from standardized test cycles (WLTP, EPA, or NEDC); highway driving at higher speeds typically yields lower efficiency than the rated value. Public rapid-charging tariffs can exceed home rates by a factor of two or more.
What this tool does not do
It does not include:
- Standing charges or subscription fees for public charging networks
- Battery degradation over time
- Charging losses (AC-to-DC conversion inefficiency, typically 10–15 %)
- Comparisons to gasoline or diesel per-mile costs
Disclaimer
This calculator is an educational mathematics tool. It does not constitute vehicle purchasing advice, financial recommendation, or a guarantee of real-world running costs. Electricity prices and vehicle efficiency vary; users remain responsible for verifying tariffs and consulting manufacturer specifications.
Questions
- Why does my real-world cost differ from the calculator?
- Efficiency varies with speed, weather, tire pressure, and driving style. Highway journeys at higher speeds often consume 20–30 % more energy per mile than test-cycle figures. Cold weather reduces battery performance and increases cabin-heating demand.
- Should I use my rated efficiency or my trip-computer average?
- Trip-computer data reflects actual driving; manufacturer ratings are test-cycle results. For budget planning, the trip average is more representative of personal use patterns.
- Does the calculator include charging losses?
- No. The tool assumes the price per kWh is what the meter records. AC charging through an on-board charger typically incurs 10–15 % conversion loss; if tariff billing is post-meter, that loss is already in the price you enter.
- How do public rapid-charger costs compare?
- Public DC fast-charging tariffs commonly range from significantly higher than home electricity rates—often double or triple residential pricing. Subscription plans may offer lower per-kWh pricing in exchange for a monthly fee.
- Can I compare this result to gasoline cost per mile?
- Yes, by calculating fuel cost per mile separately (fuel price per liter ÷ liters-per-mile efficiency, or fuel price per gallon ÷ miles per gallon). This tool performs only the EV half of that comparison; no internal-combustion engine data is embedded.
Sources & Methodology
Cost per mile = electricity price per kWh ÷ vehicle efficiency in miles per kWh. This is a direct unit-conversion division with no coefficients. The method assumes the stated efficiency (from WLTP, EPA, NEDC, or on-board computer logs) is representative of the driving conditions in question. Secondary results multiply the per-mile cost by 100 and 1,000.