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EV Charging Time Calculator

-estimated charging time
-energy needed

Estimate how long it will take to charge your electric car from one state of charge to another. Enter your battery size in kilowatt hours, the power of the charger in kilowatts, and the start and target charge levels, and this calculator returns the approximate charging time. It includes a charging efficiency factor because real charging is a little slower than the raw math suggests, and you can adjust it to match your setup. Charging power varies hugely, from a slow home outlet at around 1.4 kW to a fast public charger at 150 kW or more, and this tool makes the difference obvious. Keep in mind that fast chargers taper their speed above 80 percent to protect the battery, so real sessions to a full charge take longer than a flat estimate. All math runs locally in your browser.

How to use EV Charging Time Calculator

  1. Enter the battery size and the charge percentage you need.
  2. Enter the charger power in kilowatts.
  3. Read the estimated charging time.

Frequently asked questions

How is charging time estimated?

It divides the energy needed, from the battery size and target charge, by the charger power in kilowatts to estimate the time.

Why is real charging often slower near full?

Charging slows as the battery fills to protect the cells, so times to reach 100 percent are longer than a simple estimate suggests.

Does charger power change the time a lot?

Yes. A higher kilowatt charger delivers energy faster, so charging time drops as charger power rises.

What is EV Charging Time Calculator?

Estimate how long it will take to charge your electric car from one state of charge to another. Enter your battery size in kilowatt hours, the power of the charger in kilowatts, and the start and target charge levels, and this calculator returns the approximate charging time.

Is EV Charging Time Calculator free to use?

Yes. EV Charging Time Calculator is completely free, with no sign-up and no usage limits.

Does EV Charging Time Calculator work in a web browser?

Yes. EV Charging Time Calculator runs in any modern web browser. There is nothing to download or install.

Is my data private with EV Charging Time Calculator?

Yes. EV Charging Time Calculator runs entirely on your device in your browser, so nothing you enter is uploaded to a server.