EV Charging Time Calculator
Estimate the time required to charge your battery from X% to Y%.
Last Updated: January 2026
Inputs
Results
Est. Charging Time
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Energy Added to Battery
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Effective Charging Power
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Grid Energy Used (est.)
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How it Works
Calculates time by dividing the required energy by the effective charging speed, accounting for efficiency losses.
The Math
Time = Needed kWh / (Power × EfficiencyFactor)
Where Needed kWh is the difference between your Target % and Start % of the total capacity.
Example
Charging a 75 kWh battery from 10% to 80% (70% needs filling, i.e., 52.5 kWh).
Using a 7.2 kW charger with 10% loss:
- Power into battery = 7.2 × 0.9 = 6.48 kW
- Time = 52.5 / 6.48 ≈ 8.1 hours (8h 6m)
Frequently Asked Questions
Yes, especially on DC Fast Chargers. Above 80% SOC, charging speed often drops significantly to
protect the battery. This calculator assumes a constant average speed, which is accurate for
Level 2 (Home) charging but an estimate for DC Fast Charging.
Your car has an onboard charger limit (e.g., 11 kW) for AC charging. Even if you plug into a 22
kW station, you will only draw 11 kW.