EV Charging Time and Cost Calculator
Estimate energy, time and electricity cost to move an electric vehicle battery from a starting state of charge to a target percentage at a stated average charging power.
How to use this calculator
- Enter usable battery capacity, starting/target charge levels, average power, charging efficiency and your electricity price.
- Check the labels and units before applying the result to a real task.
- Change one input at a time when comparing scenarios.
Formula and method
Battery energy added = capacity × (target SOC − start SOC); grid energy = added energy ÷ efficiency
- Battery energy added = capacity × (target SOC − start SOC); grid energy = added energy ÷ efficiency
- Charging power varies by vehicle, charger, temperature, battery state and charge curve. Public charging fees can also include time or session charges.
Worked examples
Worked example
A 60 kWh battery charges from 20% to 80% using a 7.2 kW average charger at 90% efficiency.
36 kWh is added to the battery; grid energy is 40 kWh, taking about 5.56 hours and costing 12 at 0.30 per kWh.
36 kWh is added to the battery; grid energy is 40 kWh, taking about 5.56 hours and costing 12 at 0.30 per kWh.
Understanding the result
Estimate energy, time and electricity cost to move an electric vehicle battery from a starting state of charge to a target percentage at a stated average charging power.
Charging power varies by vehicle, charger, temperature, battery state and charge curve. Public charging fees can also include time or session charges.
Important notes
Charging power varies by vehicle, charger, temperature, battery state and charge curve. Public charging fees can also include time or session charges.
Displayed values are rounded for readability; retain appropriate precision when continuing a calculation.
Frequently asked questions
Why is grid energy higher than battery energy added?
Charging losses mean more energy is drawn from the supply than is stored in the battery. The efficiency input estimates that difference.
Will charging from 80% to 100% take the same time?
Often not. Many vehicles reduce charging power at higher states of charge, so a constant average-power estimate can understate the final portion.
Does the cost include public charging fees?
It multiplies estimated grid energy by the entered unit price. Session fees, time-based parking and operator-specific charges are not included.
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Related explanations
Learn the method behind the number or compare the terminology before using the calculator.
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This page provides a calculation tool plus explanatory information so you can understand what the result means and when the underlying method may not fit your situation.