Ev Charging Time
Calculator
Results
- Charging time (hours)
- 3.878787
- Charging time (minutes)
- 232.727272
- Energy added to battery (kWh)
- 38.4
- Energy drawn from the grid (kWh)
- 42.666666
Results
| Charging time (hours) | 3.878787 |
| Charging time (minutes) | 232.727272 |
| Energy added to battery (kWh) | 38.4 |
| Energy drawn from the grid (kWh) | 42.666666 |
formula-map diagram
- Charging time (hours)
- 3.878787
- Charging time (minutes)
- 232.727272
- Energy added to battery (kWh)
- 38.4
- Energy drawn from the grid (kWh)
- 42.666666
Formula breakdown
Formula
t = capacity × Δ% ÷ 100 ÷ (charger kW × efficiency)= 3.8787878787879
Note
Simplified model: results use idealised textbook relationships and ignore real-world factors such as driving style, load, temperature, aerodynamic and rolling losses, drivetrain efficiency, tyre and brake condition and road surface. CO2 figures are tailpipe only, based on the standard 2.31 kg CO2 per litre of petrol (2.68 kg per litre of diesel), and exclude fuel production and distribution. Use them as estimates, not as legal, safety or load-rating figures.
More in Automotive and transport
See all →Frequently asked questions
What determines how long it takes to charge an electric vehicle?+
Charging time depends on the battery's total capacity (kWh), how much of that capacity needs to be added (the charge from the starting state of charge to the target), and the charging power available (kW), which is limited by the lower of the charger's output and the vehicle's maximum acceptance rate.
How is charging time calculated?+
A basic estimate is: charging time (hours) = energy needed (kWh) ÷ charging power (kW). For example, adding 40 kWh on a 7 kW home charger takes roughly 40 ÷ 7 ≈ 5.7 hours, assuming a constant charging rate throughout.
Why does charging slow down significantly above 80% state of charge on DC fast chargers?+
To protect battery longevity and manage heat, most EVs taper their charging rate as the battery approaches full, especially above roughly 80%, so the last 20% of a fast charge can take almost as long as the first 80% — this is why fast-charging road trip planning often targets charging only to about 80%, not 100%.
What's a common misconception about charger power ratings and actual charging speed?+
People often assume a 150 kW fast charger will always deliver 150 kW to their vehicle, but the actual rate is capped by whichever is lower — the charger's maximum output or the vehicle's maximum DC charging acceptance rate — and can also be reduced by battery temperature, current state of charge, and charger sharing with another vehicle at some stations.
Why is home AC charging time so much longer than DC fast charging?+
Home charging typically uses alternating current (AC) at much lower power (often 7-11 kW) compared to DC fast chargers (50-350 kW), because higher-power AC charging would require more expensive home electrical infrastructure. The tradeoff is convenience and battery-friendly slow charging overnight versus speed on the road.