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EV Home Charging Time Calculator

Enter your battery size, charge levels, and charger specs to estimate home charging time.

How it is calculated

Energy to add is energy (kWh) = battery capacity × (target % − current %) ÷ 100. Charger power is power (kW) = volts × amps × efficiency% ÷ 100 ÷ 1000, where efficiency covers losses between the wall and the battery. Time is energy ÷ power in hours, rounded to the nearest minute and shown as hours and minutes, together with the energy and power to two decimals.

There is no result if the battery size is zero or negative, the current level is negative, the target is not above the current level or exceeds 100%, or the efficiency is 0 or above 100. The tool assumes constant power, so it ignores the slowdown most cars apply near full charge, battery temperature and the car's own onboard charger limit. Use usable battery capacity if you know it.

Worked example

A 60 kWh battery charged from 20% to 80% on a 240 V, 32 A wall box at 90% efficiency. Energy: 60 × (80 − 20) ÷ 100 = 36.00 kWh. Power: 240 × 32 × 0.90 ÷ 1000 = 6.91 kW (6.912 unrounded). Time: 36 ÷ 6.912 = 5.208 hours; the 0.208 of an hour is 12.5 minutes, which rounds up to 13. The result is 5h 13m.

Try this example →

Common mistakes

  • Entering the target as 100% and expecting it to be accurate; cars slow the last 10-20% of charging, so the real time is longer than the tool's constant-power estimate.
  • Using the wall socket's or breaker's rating for amperage when the charger or the car's onboard charger delivers less; the slower component sets the rate.
  • Entering 100 as efficiency, which ignores charging losses; a figure around 85-92% is more realistic for the charger-to-battery path. Values above 100 are rejected.
  • Putting the energy needed (kWh) in the battery field instead of the full pack size, so the percentages are applied twice.
  • Mixing up current and target charge, for example 80 and 20; the target must be above the current level or nothing is shown.

About this calculator

Charging time for an electric vehicle at home depends on how much energy needs to be added and how fast the charger can deliver it. The energy needed is roughly battery capacity (kWh) × (target % − current %), and the charging power is voltage × amperage × efficiency — a typical Level 2 home charger runs at 240V and 32A, delivering around 7.2 kW before losses.

This calculator divides the energy you need to add by your charger's real-world power output to estimate total charging time in hours. It's useful for EV owners planning overnight charging, deciding whether a 32A or 40A home charger is worth the upgrade, or estimating how a public Level 2 station compares with charging at home.

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Comments (1)

  • Editorial team

    The kWh figure shown is the energy that goes into the battery, not what the meter counts. Because charger losses are already in the power figure, you can estimate the energy drawn from the wall by dividing the shown kWh by the efficiency as a decimal. In the 36 kWh example at 90 percent, that is 40 kWh to pay for. Enter your local supply voltage too, for example 230 where that is standard. What charger rating does your home circuit allow?

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