Skip to content
ENExplore Calculators

Home EV Charging Time

Free Home EV Charging Time calculator with clear step-by-step results.

About Home EV Charging Time

Charging time is the energy the battery needs divided by charger output, but the grid has to supply more than the battery receives because of conversion and thermal losses. Applying charging efficiency to the grid side is what makes both the time and the cost figures come out right.

Formulas

Energy needed

Battery kWh = usable capacity x (target SOC - start SOC) / 100

Charging time

Hours = battery kWh / charging efficiency / charger kW

Worked example

With the default values below, Home EV Charging Time returns Charging time of 5.77. Change any input above and every figure here is recalculated in your browser.

Inputs used

Usable battery capacityminimum 1 kWh
64 kWh
Starting state of chargeaccepts 0–100 %
20 %
Target state of chargeaccepts 0–100 %
80 %
Charger outputminimum 0.5 kW
7.4 kW
Charging efficiencyaccepts 50–100 %
90 %
Off-peak tariffminimum 0 $/kWh
0.11 $/kWh

Results

Charging time
5.77 h
Charging time in minutes
346 min
Energy drawn from the grid
42.67 kWh
Cost of the charge
$4.69

Step by step

  1. 1Values used
  2. 2Energy needed
  3. 3Charging time
  4. 4Charging time= 5.77 h
  5. 5Charging time in minutes= 346 min
  6. 6Energy drawn from the grid= 42.67 kWh
  7. 7Cost of the charge= $4.69

Assumptions and limits

  • The result is derived only from the 6 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax or compounding frequency into account.
  • Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

Why charge to only 80%?

AC charging tapers above roughly 80% on many vehicles, and staying below it reduces calendar ageing of the cells. Charge to 100% when you need the full range.

Does a 7.4 kW charger really deliver 7.4 kW?

Only if the vehicle's onboard charger can accept it. Many models are limited to 3.6 or 7.4 kW single phase regardless of what the wallbox can supply.

Related Calculators

Home EV Charging Time – Calculate Charging time | Calcrivo