EV charging time calculator

Estimate charging time from battery capacity, starting and target charge levels and effective power. Compare scenarios with clear assumptions.

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Set your data

Usable battery capacity (kWh)

Initial charge (%)

Final charge (%)

Losses on grid energy (%)

Effective average input power (kW)

Enter charging requirements, losses and actual average input power. Example: 60 kWh battery from 20% to 80%, 10% losses, average 7.4 kW = about 5.41 hours.

Result

Your result will appear here.

From the grid to the battery

Change the charge target to compare energy stored in the battery with energy drawn from the grid. The estimate assumes constant power.

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How to use the tool

Estimates below 0.005 hours are displayed in seconds.
Enter charging requirements, losses and actual average input power.
Example: 60 kWh battery from 20% to 80%, 10% losses, average 7.4 kW = about 5.41 hours.
Change the charge target to compare energy stored in the battery with energy drawn from the grid. The estimate assumes constant power.
Drag the controls in the figure, or focus them and use the arrow keys. The form updates immediately. Use the form fields for values outside the figure’s scale.
The result updates as you edit the fields or the figure. You can copy it immediately.

Method and principles

Formula

t = \frac{E}{P}

Theoretical estimate with constant average input power and losses. Use actual average grid power; charger peak power is not the average.

Practical example

Input

Usable battery capacity (kWh): 60
Initial charge (%): 20
Final charge (%): 80
Losses on grid energy (%): 10
Effective average input power (kW): 7.4

Result

5.41 h

Limits and checks

Limits and checks
Parameter	Value
Usable battery capacity (kWh)	≥ 0.01; ≤ 1000000000
Initial charge (%)	≥ 0; ≤ 100
Final charge (%)	≥ 0; ≤ 100
Losses on grid energy (%)	≥ 0; ≤ 80
Effective average input power (kW)	≥ 0.01; ≤ 1000000000

PRACTICAL GUIDES

What does a charge cost? Work from battery level to billed energy

A battery percentage is not a direct measurement of the energy you pay for. A useful estimate separates stored energy, input energy and the service’s billing basis.

Follow the steps

EV charging time calculator

Set your data

Result

How to use the tool

Method and principles

Formula

Practical example

Limits and checks

What does a charge cost? Work from battery level to billed energy

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