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EV Charging Time Calculator

Find how long an EV takes to charge.

How it is calculated

The tool estimates the time to add a given amount of energy: hours = battery / (charger × efficiency / 100), with battery in kWh, charger power in kW and efficiency in percent. The result is shown both as decimal hours and as hours and minutes.

If efficiency is left empty, zero or above 100, the tool uses 90%. Battery and charger power must be greater than zero. The battery figure is the energy you want to add, not necessarily the full pack size: for a 20% to 80% top-up of a 60 kWh pack, enter 36. The tool assumes constant power the whole way, whereas real chargers, especially DC fast ones, slow down as the battery fills.

Worked example

Charge 60 kWh from a 7.4 kW home wallbox at 90% efficiency. Energy drawn through the charger is delivered at 7.4 × 0.90 = 6.66 kW into the battery. Time = 60 / 6.66 = 9.01 h, which is 9 hours and 0.01 × 60 ≈ 1 minute, shown as 9 h 1 m.

Try this example →

Common mistakes

  • Entering the whole pack size when you only need a partial top-up. Charging from 20% to 80% needs only 60% of the capacity.
  • Mixing up kW and kWh. Charger power is kW (a rate), battery size is kWh (an amount).
  • Using the charger's rated maximum when the car's onboard charger is the limit. A car that accepts 7.4 kW on AC will not charge faster on an 11 kW wallbox.
  • Expecting the fast-charger time to match for 80% to 100%. Most cars slow right down near the top, so a constant-power estimate is optimistic there.

About this calculator

This calculator estimates EV charging time as battery capacity in kilowatt-hours divided by charger power in kilowatts, then adjusted for charging efficiency — typically 85–95% because energy is lost as heat during AC-to-DC conversion inside the car's onboard charger (DC fast charging skips that conversion and is more efficient). The three real-world charging tiers behave very differently: Level 1 (120V household outlet, ~1.4 kW) can take over two days for a full charge, Level 2 (240V home or public chargers, ~7–11 kW) typically takes 4–10 hours, and DC fast charging (50–350 kW) can add 80% in 20–40 minutes, though the charging curve tapers sharply above 80% state of charge as the battery management system protects the cells.

EV owners use this to plan overnight home charging or road-trip fast-charging stops, apartment dwellers use it to judge whether a shared Level 2 charger is fast enough for their commute, and fleet managers use it to schedule depot charging around vehicle duty cycles. Enter your battery's kWh capacity and your charger's kW rating to get a realistic charging estimate.

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