Automotive
EV charging cost
Estimate grid energy and charging cost between two battery percentages.
Calculators / Automotive / EV charging time estimate
EV charging time estimate calculator
Estimate charging time using average power, not the peak charger rating.
On this page
Energy added to battery43.2kWh
Time estimate6.67hours
Calculator controls
How to calculate
Estimate charging time using average power, not the peak charger rating.
Hours = usable capacity × (target − starting charge)/100 ÷ (average wall power × efficiency/100).
Worked example
Usable battery capacity (kWh): 72; Starting charge (%): 20; Target charge (%): 80; Average wall charging power (kW): 7.2; Charging efficiency (%): 90.
Energy added to battery: 43.2 kWh; Time estimate: 6.67 hours.
Assumptions and limits
Estimate charging time using average power, not the peak charger rating. Tapering, battery temperature and shared chargers change the average. This is not a guaranteed arrival or departure time.
Results are rounded for display; calculations use unrounded values. Read our calculation methodology.
Understanding the result
Estimate charging time using average power, not the peak charger rating. Tapering, battery temperature and shared chargers change the average. This is not a guaranteed arrival or departure time.
When this tool is useful
Hours = usable capacity × (target − starting charge)/100 ÷ (average wall power × efficiency/100).
Understanding your inputs
| Input | What to enter |
|---|---|
| Usable battery capacity (kWh) | Enter a number of at least 0.001 and no more than 1000000000000. |
| 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. |
| Average wall charging power (kW) | Enter a number of at least 0.001 and no more than 1000000000000. |
| Charging efficiency (%) | Enter a number of at least 0.001 and no more than 100. |
Frequently asked questions
Why can the real charging stop take longer than the estimate?
The input is average usable charging power. A charger may deliver less than its advertised peak as the battery fills or warms, and queueing or payment time is not included.