EV Charging Time Calculator
Estimate charging time from battery size, state of charge, average charger power and energy losses.
Currency selection changes the unit label, not an exchange rate. Enter every price in the selected currency.
How to choose the inputs
Enter average power supplied to the charging process, before the stated loss. Do not combine power already measured as stored battery energy per hour with a second loss adjustment. The percentage means a share of incoming energy: 10% losses require division by 0.90, not multiplication by 1.10.
Formula and measurement boundary
Three worked scenarios
These are fixed hypothetical examples, not live tariffs or verified product data. They use EUR and kilometres where applicable and do not change with the form settings. Only the table input changes.
Unchanged inputs
- Usable battery capacity: 60 kWh
- Start charge: 20 %
- Target charge: 80 %
- Charging losses: 10 %
| Average charging power | Estimated result |
|---|---|
| 3.6 kW | 11 h 7 min |
| 7.2 kW | 5 h 33 min |
| 11 kW | 3 h 38 min |
Each example adds 36 kWh to the battery and requires 40 kWh at the input. Halving average power doubles the calculated time. Displayed times are rounded to the nearest minute.
What this result does not establish
- A charger peak rating is not an average charging curve.
- The model does not simulate temperature, tapering, preconditioning or shared charger power.
- Use a measured session average for a comparable charge interval whenever possible.
Use sustained power for a schedule; peak power is only a ceiling
The following are additional hypothetical decision examples. Separately discussed fees, reserve allowances or running costs are not automatically added to the form result.
A hypothetical 60 kWh usable pack charged from 20% to 80% needs 36 kWh stored. With 11 kW input and 90% efficiency, the constant-power estimate is 36 ÷ 9.9 = 3.64 hours. Entering a 22 kW wallbox rating for a car that accepts only 11 kW would halve the estimate incorrectly. Check the vehicle AC limit, supply limit and any load-management setting before choosing power.
For DC charging, a 150 kW advertised peak does not mean the full session sustains 150 kW. Charging curves, battery temperature and shared charger power affect the average. Use session energy divided by session time when estimating a repeat journey under similar conditions. Do not transfer one warm-battery session to an unconditioned winter arrival without a separate scenario.
A deadline needs more than the calculated energy-transfer time. Include connection time, charger availability and any charging schedule restrictions. Compare the estimate with two or three logged sessions and use the slowest comparable session as a planning check. The calculator cannot predict a charging curve or a queue.
Sources and their scope
- EIA: measuring electricity — Power and energy units only; not equipment performance.
These reference pages were accessed on 21 September 2026. The equations and examples are the site’s own model; these sources do not certify its defaults or results.
Frequently asked questions
Does this predict a DC charging curve?
No. One average power value represents the whole session.
Why does the time differ from a manufacturer claim?
The starting charge, target, average power and loss assumptions may differ. Match all of them before comparing.
Read the model and verification limits