Formula and meaning
The calculator determines vehicle energy for the trip and accounts for charging losses through the efficiency when estimating grid energy.
E₍trip₎ = distance · consumption / 100 · E₍grid₎ = E₍trip₎ / η · Cost = E₍grid₎ · price
E-mobility · cost
EV Charging Cost Calculator
Calculate EV charging cost and cost per 100 km from distance, consumption, electricity price and charging losses.
EVAC/DC
02
Results
K = E · Preis
Set the inputs and run the calculation.
Context
For 200 km, 18 kWh/100 km, €0.35/kWh, and 90% efficiency, charging costs are about €14.00.
Electricity price and efficiency are treated as constant. Standing charges, time-of-use tariffs, public-session fees, and different charging locations are excluded.
Inputs and method
Charging cost per trip
Calculate grid energy and cost from distance, consumption, tariff and efficiency.
Inputs
Distance, vehicle consumption, electricity price and charging efficiency determine grid energy.
Consumption is referenced to driven distance, while tariff applies to grid energy after charging losses. Public start, time or idle fees can dominate a pure kWh comparison.
Calculation
Trip energy = distance·consumption/100; grid energy = trip energy/η; cost = grid energy·price.
Example
200 km at 18 kWh/100 km, €0.35/kWh and 90% gives about €14.
Sources and limits: Energy balance; standing charges, blocking fees and time-of-use tariffs are excluded.
Charging cost per trip in detail
Calculate grid energy and cost from distance, consumption, tariff and efficiency.
What does this quantity describe?
Energy calculators balance quantities over time and separate useful energy, losses and grid import. This matters because power is instantaneous while energy is its time integral.
Formula and variables
Trip energy = distance·consumption/100; grid energy = trip energy/η; cost = grid energy·price.
Choose the inputs correctly
Distance, vehicle consumption, electricity price and charging efficiency determine grid energy. Consumption is referenced to driven distance, while tariff applies to grid energy after charging losses. Public start, time or idle fees can dominate a pure kWh comparison.
How to use the calculator
Enter the distance driven, vehicle consumption in kWh/100 km, the electricity price for the charging point used and the charging efficiency. For public charging, use the actually billed kWh price, not a household electricity tariff.
Worked example
200 km at 18 kWh/100 km, €0.35/kWh and 90% gives about €14.
Understand the result and units
Consumption is referenced to driven distance, while tariff applies to grid energy after charging losses. Public start, time or idle fees can dominate a pure kWh comparison. An annual value describes a scenario, not a guarantee for every day. Efficiency, coincidence, temperature, driving profile and tariff assumptions can change practical results more than rounding.
Distance in kilometres, consumption in kWh/100 km, energy in kWh, price and cost in euros or euros per 100 km.
Typical applications
Comparing charging cost across different tariffs or charging points for the same trip, or projecting annual electricity cost from planned mileage.
Assumptions, limits and common mistakes
Energy balance; standing charges, blocking fees and time-of-use tariffs are excluded.
Common mistake: For public charging, don't use only the energy price if blocking, start or time-based fees also apply – these are not included here and must be added separately. Don't neglect efficiency: grid energy, and therefore cost, is always higher than the pure trip energy.
Frequently asked questions
Which electricity price should I enter?
The price per kWh actually billed at the charging point used – household, employer or public charging tariffs often differ substantially.
Why is grid energy higher than the pure trip energy?
Charging losses from AC/DC conversion and battery management mean more energy must be drawn from the grid than ends up available for driving.
Are standing charges or blocking fees included?
No. The calculator models only the pure energy balance; public surcharges must be added separately for a realistic total comparison.
Dynamic tariff? Find the cheapest charging window with the electricity charging planner →