Free Online Calculators
Battery capacity + charge power → charge time & costs
Find out exactly how long it takes to charge your EV and what it will cost you in electricity. Enter your battery capacity, current charge level, and charger power output. The calculator uses the simple formula: charge time = remaining kWh ÷ charger power (kW).
Charging time depends on two main factors: how much energy your battery needs and how fast your charger can deliver it. The basic formula is simple — divide the energy needed (in kWh) by the charger's power output (in kW) to get hours. For example, charging a 60 kWh battery from 20% to 80% means filling 36 kWh. On a standard 7.4 kW wallbox, that takes roughly 4.9 hours. On a 50 kW DC fast charger, the same session takes under an hour.
Real-world charging is a bit messier. Onboard charger limits, battery temperature, and the tapering effect near full charge all reduce actual speed. That's why this EV charging time calculator factors in your usable battery capacity, current state of charge, target charge level, and charger type — giving you a practical estimate rather than a textbook answer.
A regular household outlet (Level 1, around 1.4–2.3 kW) is the slowest option. Adding 36 kWh at 1.4 kW takes over 25 hours — fine for overnight top-ups on a short commute, but not practical for a larger EV or a quick turnaround. Most EV owners only rely on this as a backup.
A home wallbox or Level 2 charger (7–22 kW) is the sweet spot for daily use. A 22 kW three-phase wallbox can fully charge a 77 kWh battery from empty in about 3.5 hours, though most home installations are capped at 7.4 kW, bringing that time to around 10–11 hours overnight. DC fast chargers (50–350 kW) are built for highway stops — a 150 kW charger can add 100 km of range in roughly 10–15 minutes on a compatible vehicle.
Knowing your charger's actual output — not just its label — matters a lot. A 22 kW wallbox means nothing if your car's onboard AC charger maxes out at 11 kW. Always use the lower of the two values when estimating electric car charging time. This calculator handles that automatically when you enter your vehicle's maximum AC charging rate.
Beyond time, cost and range added are the two numbers most drivers care about. If your local electricity rate is $0.25 per kWh and you're adding 36 kWh, expect to pay around $9 for that session. Compare that to an equivalent petrol cost of $20–30 for the same range, and the savings become clear fast.
Range added depends on your vehicle's efficiency. A car consuming 18 kWh per 100 km gains about 200 km of range from 36 kWh. A less efficient SUV at 25 kWh/100 km gains closer to 144 km from the same charge. You can explore all these scenarios instantly at simple-calculator.online without needing to run the math yourself.
Divide the energy you need to add (kWh) by your charger's output (kW). For a 7.4 kW wallbox adding 40 kWh, that's roughly 5.4 hours. Always use the lower of your charger's power and your car's maximum AC acceptance rate.
Yes. Most EVs slow down charging speed above 80% to protect the battery. The last 20% can take nearly as long as the first 80%, which is why many drivers stop at 80% for daily use.
A 7.4 kW wallbox might take 8–10 hours for a full charge, while a 100 kW DC fast charger can do the same in under an hour. Fast chargers are ideal for road trips; wallboxes suit overnight home charging.