Automotive
EV range estimate
Estimate EV driving distance while retaining a battery reserve.
Calculators / Automotive / EV charging cost
EV charging cost calculator
Estimate grid energy and charging cost between two battery percentages.
On this page
Energy added to battery45kWh
Energy drawn from grid50kWh
Estimated charging cost10
Calculator controls
How to calculate
Estimate grid energy and charging cost between two battery percentages.
Battery energy = usable capacity × charge increase; grid energy = battery energy ÷ (1 − loss rate); cost = grid energy × tariff.
Worked example
Usable battery capacity (kWh): 75; Starting charge (%): 20; Target charge (%): 80; Charging loss (%): 10; Electricity price per kWh: 0.2.
Energy added to battery: 45 kWh; Energy drawn from grid: 50 kWh; Estimated charging cost: 10 .
Assumptions and limits
Uses a constant loss percentage and energy tariff. Charging overhead, temperature, battery conditioning, idle fees and time-of-use pricing can change the actual cost.
Results are rounded for display; calculations use unrounded values. Read our calculation methodology.
Understanding the result
Energy delivered to the battery is lower than energy drawn from the grid when charging losses occur. The cost therefore uses grid energy, not only stored energy.
When this tool is useful
Estimate the electricity cost of a home or public charging session.
Understanding your inputs
| Input | What to enter |
|---|---|
| Usable battery capacity (kWh) | Enter a number of at least 0.01 and no more than 1000. |
| Starting charge (%) | Enter a number of at least 0 and no more than 100. |
| Target charge (%) | Enter a number of at least 0 and no more than 100. |
| Charging loss (%) | Enter a number of at least 0 and no more than 50. |
| Electricity price per kWh | Enter a number of at least 0 and no more than 1000. |
Frequently asked questions
Should I enter usable or gross battery capacity?
Use usable capacity when available because the displayed state of charge normally refers to the usable operating window.
Does this include charging-station fees?
Only if they are represented by the per-kWh price. Add connection, parking or idle fees separately.