EV Charging Time Calculator
"How long does it take to charge an electric car?" is the first question every EV owner — and every driver thinking about installing a home charger — asks. The answer is simple maths: how much energy the battery needs, divided by how fast the charger delivers it. Enter your battery size, where the charge is now, where you want it to be, and your charger's power. This free calculator gives you the time and the energy added, for everything from a 7.4 kW home wallbox to a 150 kW DC fast charger.
EV charging time calculator FAQs
Why does charging slow down after 80%?
To protect the battery, every EV tapers its charging speed as it fills — the last 20% can take as long as the previous 60%. That is why road-trip stops usually charge to about 80%, and why this calculator's estimate is most accurate for charges that stay below that point.
How long does a 7.4 kW home charger take to charge an EV?
For most drivers, easily. At 7.4 kW you add roughly 25–30 miles of range per hour, so an overnight charge covers several days of typical driving. Bigger batteries or very high daily mileage are the main reasons to look at 11 kW or 22 kW — and those need a suitable electrical supply, which is why a proper home installation survey matters.
Why is my car charging slower than the charger's kW rating?
The car and the charger negotiate, and the lower limit wins. A car that accepts at most 50 kW DC will never draw 150 kW, whatever the charger offers. Cold batteries, high starting charge and shared power at busy stations also reduce the real speed below the headline number.
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