Example: AC charging
A 75 kWh usable battery charging from 20% to 80% needs 45 kWh in the theoretical battery window. With a 7.2 kW AC charger and no lower vehicle limit entered, the constant-power baseline is 6 hours 15 minutes.
EV Charging Time Calculator
Estimate how long an EV takes to charge from its current battery level to a target charge. Compare AC home charging, Level 1 / Level 2 power, and DC fast charging using battery kWh, charger kW, and an optional vehicle charging limit.
Estimate charging time
Enter the charging window and rated power. Results update automatically.
Baseline estimate, not an exact charging-session prediction: This EV charging time calculator uses a constant-power baseline. It does not model charging losses, battery temperature, battery conditioning, station power sharing, or a vehicle-specific DC charging curve. Use the result to compare charging setups, not as a guaranteed arrival-to-departure time.
Quick answer
How long does it take to charge an EV? Start with the battery energy needed for your charging window: usable battery capacity × (target % − current %) ÷ 100. Divide that energy by the lower of charger power and the vehicle's charging limit when known. A 60 kWh battery going from 20% to 80% needs 36 kWh, so the constant-power baseline is 5 hours at 7.2 kW or about 3 hours 16 minutes at 11 kW. Real charging can take longer.
How the calculation works
1. Energy needed
Battery kWh × SOC change
2. Effective power
min(charger kW, vehicle kW)
3. Baseline time
Energy needed ÷ effective power
If you leave the vehicle limit blank, the baseline assumes the vehicle can accept the charger's full rated power. Level 1 and Level 2 AC charging are still constrained by the vehicle's AC acceptance / onboard charger limit, while DC fast charging is constrained by the vehicle's DC acceptance and a changing charge curve. The calculator does not apply a hidden 90% efficiency factor or a universal DC taper multiplier.
Example: DC fast charging
An 80 kWh usable battery charging from 20% to 80% needs 48 kWh. With a 150 kW charger and a 100 kW vehicle DC limit, the rated-power baseline is about 29 minutes. Real DC charging is variable, so this is not a prediction that the session will finish in exactly 29 minutes.
Level 1, Level 2, and DC fast charging time reference
This table compares a 60 kWh usable battery charging from 20% to 80%, which means 36 kWh must be added to the battery. Times use the same constant-power formula as the calculator and assume no lower vehicle charging limit. DC fast-charging rows are mathematical baselines only because real DC power varies during the session.
| Charging example | Rated power | 20% → 80% baseline |
|---|---|---|
| Level 1 AC | 1.9 kW | 18 hr 57 min |
| Level 2 AC | 7.2 kW | 5 hr |
| Level 2 AC | 7.4 kW | 4 hr 52 min |
| Level 2 AC | 11 kW | 3 hr 16 min |
| DC fast (baseline only) | 50 kW | 43 min |
| DC fast (baseline only) | 150 kW | 14 min |
These are comparison examples, not typical-time promises for a specific EV. The vehicle's own AC or DC limit can reduce effective power, and DC fast charging rarely holds peak power through the full charging window.
US
The calculator uses kWh, kW and battery percentage, so no US-specific unit conversion is required.
CA
The same kWh, kW and state-of-charge calculation applies in Canada. No electricity-price or network assumptions are built into the result.
Accuracy and limitations
- Use usable battery capacity when available; gross or nominal capacity can make the SOC-based estimate rougher.
- The charger's rated power and the vehicle's maximum charging power are ceilings, not guaranteed average power.
- AC charging can take longer because of conversion losses, temperature, battery conditioning and electrical limits.
- DC fast-charging power normally changes throughout the session and often falls at higher states of charge.
- The 80% warning is a planning boundary, not a universal point where every EV begins tapering.
- Level 1, Level 2 and DC fast labels describe charging categories; always enter the actual charger power in kW for the setup you want to compare.
- The calculator does not model vehicle compatibility, charging-network availability, electricity cost, range added or battery aging.
Sources and methodology
- U.S. Department of Energy — Alternative Fuels Data Center for EV charging levels, equipment and factors that affect charging time.
- U.S. Department of Energy — EVSE Infrastructure Training for AC charging equipment and onboard-charger power limits.
- Natural Resources Canada — Electric vehicle charging for Level 1 and Level 2 AC charging, DC fast charging, and factors that influence charging time in Canada.
- Natural Resources Canada — EV Charging Assessment for Canadian charging context and DC fast-charging guidance.
Frequently Asked Questions
How do you calculate EV charging time?
Multiply usable battery capacity by the percentage-point increase in state of charge to estimate battery energy needed, then divide by the lower of charger rated power and the vehicle's maximum charging power when that limit is known. FigureNorth reports a constant-power baseline rather than an exact real-world session time.
How long does it take to charge an EV from 20% to 80%?
It depends on usable battery capacity and effective charging power. For example, a 60 kWh usable battery going from 20% to 80% needs 36 kWh in the battery. At a constant 7.2 kW the baseline is 5 hours; at 11 kW it is about 3 hours 16 minutes. Real charging can take longer.
How long does Level 1 EV charging take?
Level 1 uses 120 V AC in the United States and is the slowest common home-charging option. For a 60 kWh usable battery going from 20% to 80%, a 1.9 kW constant-power baseline is about 18 hours 57 minutes. Vehicle limits, losses and conditions can extend the real session.
How long does Level 2 EV charging take?
Level 2 charging time depends on the charger and the vehicle's AC acceptance limit. Using a 60 kWh usable battery from 20% to 80% as a comparison, the constant-power baseline is 5 hours at 7.2 kW, about 4 hours 52 minutes at 7.4 kW, and about 3 hours 16 minutes at 11 kW.
How long does DC fast charging take?
DC fast charging cannot be predicted accurately from peak kW alone because power usually changes during the session. A 60 kWh usable battery from 20% to 80% needs 36 kWh; the mathematical baseline is about 43 minutes at 50 kW and 14 minutes at 150 kW, but real DC sessions can be substantially longer.
What charger power should I enter in the calculator?
Enter the charger's rated output in kW for the charging setup you want to compare. If you know the vehicle's maximum charging power for the selected AC or DC mode, enter that too; the calculator uses the lower of the charger and vehicle limits.
What is vehicle maximum charging power?
It is the highest charging power your vehicle can accept for the selected charging type. For AC charging, this normally reflects the onboard charger's AC limit. For DC fast charging, it means the vehicle's maximum DC fast-charge acceptance. The AC and DC limits are not interchangeable.
Why does DC fast charging often slow down above 80%?
Charging power often falls at higher states of charge to protect the battery, but 80% is only a useful planning boundary, not a universal taper point. The exact charging curve depends on the vehicle, battery temperature, conditioning and other operating conditions.
Should I use usable or gross battery capacity?
Use usable battery capacity when available because dashboard state of charge generally refers to the battery window the vehicle allows you to use. If you only know gross or nominal capacity, the result is a rougher baseline; FigureNorth does not apply a guessed hidden battery buffer.
Is the EV charging time result an exact prediction?
No. It is an idealized constant-power baseline. FigureNorth does not apply a universal 90% efficiency factor or a made-up DC taper coefficient. Actual time can be longer because of conversion losses, temperature, battery conditioning, site power limits and changing vehicle demand.