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Electric vehicles measure efficiency the way gas cars measure fuel economy, just with different units: instead of miles per gallon (MPG), an EV's efficiency is expressed in miles per kilowatt-hour (miles/kWh), and instead of paying per gallon at a pump, you're paying per kilowatt-hour of electricity — whether that's at home, at a workplace charger, or at a public fast-charging station. The underlying trip-cost math is otherwise identical to a gas car's: how much "fuel" (in this case, electricity) does the distance require, and what does that fuel cost at the price you'll actually pay. The electricity-price side of this calculation deserves particular attention for EV owners, since it varies far more than gas prices do depending on where you charge — home electricity is typically the cheapest option, workplace or destination charging is often free or subsidized, and public DC fast-charging on a road trip is frequently priced several times higher per kWh than home electricity, sometimes closer to (or even above) the cost of gas per mile. This tool calculates the electricity cost of an EV trip from the trip distance, your vehicle's efficiency in miles per kWh, and the electricity price per kWh you'll actually pay.
How it works
The calculation mirrors the gas-trip-cost calculation with electricity units substituted in. First, kilowatt-hours needed = trip distance ÷ vehicle efficiency (miles per kWh) — this tells you how much energy the trip will consume from the battery. Second, total cost = kWh needed × price per kWh. Because the relationship is linear, doubling the distance doubles the cost (all else equal), and a more efficient vehicle (higher miles/kWh) proportionally reduces the kWh needed and therefore the total cost.
- Enter trip distance (miles).
- Enter efficiency (miles per kWh).
- Enter electricity price ($/kWh).
- Click Calculate to see your results.
Examples
A 300-mile EV trip on home charging
At 3.5 miles/kWh efficiency and $0.15/kWh (a typical home electricity rate), a 300-mile trip needs about 85.7 kWh (300 ÷ 3.5), costing about $12.86 (85.7 × 0.15).
The same trip relying on public fast charging
At the same 3.5 miles/kWh efficiency but a public fast-charging rate of $0.43/kWh, the same 300-mile trip still needs 85.7 kWh, but now costs about $36.85 — nearly three times as much as charging at home, illustrating why charging location matters so much for EV trip budgeting.
A shorter trip in a highly efficient EV
At 4.5 miles/kWh efficiency and $0.16/kWh, a 120-mile trip needs about 26.7 kWh, costing about $4.27.
Who should use it
- Budgeting an EV road trip's charging cost.
- Comparing EV vs. gas trip costs directly.
- Comparing the cost difference between home charging and public fast charging for the same trip.
Industry applications
- Personal travel budgeting
- EV fleet management
Advantages
- Direct EV parallel to the familiar gas-cost calculation.
- Works with any efficiency and electricity rate.
- Useful for comparing home vs. public charging costs.
Limitations
- Doesn't account for charging losses or temperature effects on real-world efficiency.
Common mistakes to avoid
- Using a home electricity rate when planning a trip that relies on public fast chargers, which usually charge more per kWh.
- Using the EPA-rated efficiency figure without adjusting for real-world factors like cold weather or highway speeds, which typically reduce efficiency.
- Forgetting that charging losses (energy lost as heat during charging) mean the electricity you pay for is slightly more than what the battery actually stores.
Best practices
- Use your vehicle's real-world observed efficiency (from your own driving) rather than the EPA-rated figure for the most accurate cost estimate.
- For a road trip relying on public charging, check the specific network's pricing along your route rather than assuming a flat rate.
- Budget a bit extra for cold-weather trips, since heating and battery conditioning can meaningfully reduce real-world efficiency.
Tips
- Compare directly against the Gas Trip Cost Calculator for the same route to see the real cost difference between an EV and a gas vehicle.
- Check a charging network's app for real-time pricing before a long trip, since public rates can vary by location and time of day.