When to use this calculator
Battery energy and billed grid energy differ when charging is less than 100% efficient.
Explore the electric vehicle energy calculators for other questions in this topic. For a related calculation, use the EV Journey Energy Calculator: Estimate electricity used over a trip at a chosen consumption rate.
PUTTING IT INTO PRACTICE
EV Cost Per Kilometre: a worked example
The values below are an illustrative example, not a recommendation. Replace them with measurements or assumptions that match your question.
| Input | Example value |
|---|---|
| Battery consumption (kWh/100 km) | 18 |
| Grid price per kWh | 0.3 |
| Charging efficiency (%) | 90 |
| Result | 0.06 per km |
- Check the input labels and enter the example values above.
- Apply the relationship: Cost per km = consumption × price/(100 × efficiency/100).
- The result is 0.06 per km, rounded for display.
How to interpret your result
Session fees, standing charges and non-energy vehicle costs are excluded.
Usable battery capacity differs from gross rated capacity. Charging losses mean grid energy can exceed energy added to the battery. Constant-power time estimates do not reproduce a full charging curve.
Frequently asked questions
Will a constant-power charging estimate match a real session?
Not necessarily. Actual power can taper or vary with temperature, state of charge, equipment and power sharing.
When is the ev cost per kilometre calculator useful?
Battery energy and billed grid energy differ when charging is less than 100% efficient.
How do I use the ev cost per kilometre calculator?
Enter battery consumption (kwh/100 km), grid price per kwh, charging efficiency (%). The result updates automatically. Use the units shown beside each input; the example values illustrate the method.
Which formula does this calculator use?
Cost per km = consumption × price/(100 × efficiency/100).
What should I check before using the result?
Session fees, standing charges and non-energy vehicle costs are excluded.
How are results rounded?
Scalar numbers display up to six decimal places, with scientific notation for very large or small values. Text, fraction, date and schedule outputs use the format described on the tool. Intermediate calculations use JavaScript floating-point arithmetic. Keep sensible precision for your measurements.
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