EV Charging Time Calculator

The tool finds the energy to add as battery capacity times the gap between start and target percent, then divides by charger power times efficiency. For a 60 kWh car going 20 to 80 percent at 7.4 kW and 0.9 efficiency, that is 36 kWh divided by about 6.66 kW, which is roughly 5 hours 24 minutes.

Above roughly 80 percent most EVs taper the rate to protect the cells, so the last stretch takes longer than the math suggests. This tool assumes a steady rate, so very high targets read a little optimistic.

A standard home outlet is about 1.4 to 2.3 kW, a home wall box 7 to 22 kW, and DC fast chargers 50 kW and up. Use the lower of the charger's rating and the car's onboard AC limit, since the car will not accept more than it is built for.

Some energy is lost as heat in the cable, charger and battery, so a little more is drawn from the wall than the pack actually gains. The default of 0.9 reflects typical AC charging losses, and lowering it lengthens the estimate.

Use the usable capacity, which sits slightly below the total pack size because carmakers hold back a buffer. The tool only charges the gap between your start and target percentages, so the usable number gives the truest time.

Both fit the same formula, you just enter the relevant power. AC charging through a wall box is limited by the car's onboard charger, often 7 to 22 kW, while DC fast charging bypasses it and can be 50 kW or far higher, so it finishes much sooner.

Yes. Set the start to 0 and the target to 100, as long as the target stays above the start. Remember that real charging tapers near full, so an empty to full estimate on a fast charger will read shorter than reality.

Yes. Cold batteries charge slower, especially on DC fast chargers, so real winter times can run longer than this steady rate estimate. Preconditioning the battery before a fast charge helps close that gap.

No. The estimate runs locally in your browser, so nothing about your car or charger is uploaded or stored.