EV Charging Time Calculator
Estimate the time required to charge an electric vehicle based on battery size, charger output, and current state of charge.
How to calculate EV charging time
The formula is Time (hours) = (Battery Capacity × Percentage Difference) / (Charger Power × Efficiency).
For example, taking a 60 kWh battery from 20% to 80% (a 60% increase) using an 11 kW charger at 90% efficiency takes approximately 3.64 hours.
Common EV Charging Times (60 kWh Battery, 20% to 80%, 0.9 Eff)
| Charger Power (kW) | Type | Estimated Time |
|---|---|---|
| 3.6 kW | Level 2 AC | 11.1 hours |
| 7.2 kW | Level 2 AC | 5.5 hours |
| 11.0 kW | Level 2 AC | 3.6 hours |
| 22.0 kW | Level 2 AC | 1.8 hours |
| 50.0 kW | DC Fast Charge | 0.8 hours (48 mins) |
Frequently Asked Questions
Why is charging efficiency included?
During AC charging, the onboard charger converts alternating current to direct current, losing some energy as heat. A typical efficiency is around 90%.
Why does charging slow down past 80%?
To protect the battery cells and maintain longevity, the battery management system reduces the charging power significantly as it approaches 100%. This calculator provides a linear estimate that is most accurate for the 10% to 80% range.
Can I use this for DC fast charging?
Yes, but keep in mind that DC fast charging curves are highly non-linear. The average charging power over your session will often be lower than the peak kW rating of the charger.