⚡ EV Cost Calculator
Trip Distance
Vehicle Settings
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Enter distance, efficiency, and electricity price to calculate
Enter your trip distance, EV efficiency, and electricity price to calculate charging cost. Also useful for comparing running costs against a gasoline car, with support for multiple segments and round trips.
How to use
- Enter the trip distance. Click "+ Add segment" if you have multiple legs.
- Turn on "Calculate round trip" if needed.
- Enter your EV's efficiency and the electricity price.
- Total distance, energy needed, and electricity cost are calculated automatically.
How the calculation works
An electric vehicle's charging cost is the energy needed multiplied by the price per kWh. The energy needed is distance ÷ efficiency (km/kWh) — the EV equivalent of fuel economy, telling you how far one kWh takes you. So charging cost = distance ÷ efficiency × price per kWh. Multiple legs and round trips work as in the fuel cost calculator, and the result is rounded up to the next whole yen. The price per kWh depends heavily on where you charge. At home it is your electricity tariff; at public rapid chargers it follows the charging network's pricing, which may be per minute or a monthly plan. Enter the rate you actually pay. Charging also loses some energy, so not all the electricity drawn from the charger ends up in the battery.
Worked example
Driving 300 km at 6 km/kWh with electricity at ¥31/kWh 1. Energy needed: 300 ÷ 6 = 50 kWh 2. Charging cost: 50 × 31 = ¥1,550 The same 300 km in a petrol car (15 km/L, ¥170/L) costs ¥3,400, a ¥1,850 difference in energy cost. The total cost of ownership, including the car's price and insurance, needs a separate comparison.
Things to be aware of
- Charging losses are not included, so real costs are slightly higher than calculated.
- Efficiency varies a lot with temperature and heating or cooling use, and tends to be worse in winter.
- Rapid charging may be priced per minute or through a subscription rather than per kWh.
- Amounts are rounded up to the next whole yen.
FAQ
How is this different from the Gas Cost Calculator?
This tool calculates EV charging cost based on efficiency (km/kWh) and electricity price. For a gasoline car, use the Gas Cost Calculator instead.
Can it handle a trip with multiple segments?
Yes — add segments to get the total distance and total cost together.
Can I compare running costs against a gas car?
Yes — calculate the same distance in both the Gas Cost Calculator and this tool to compare fuel cost side by side.
Does the price differ between fast and slow charging?
Since you enter the price per kWh directly, use whichever rate matches the charging plan or provider you actually use.
Where do I find my EV's efficiency (km/kWh)?
Most EVs show it on the dashboard, or you can use the manufacturer's published figure. Real-world efficiency varies with driving conditions, so a figure based on actual driving tends to be more accurate.