🚀 EV Charging Speed Calculator – Range Added per Hour

Range added per hour = charging power × car efficiency. A car using 3.5 miles per kWh on a 7 kW charger adds roughly 22 miles per hour after about 10% charging losses.

The power actually used is the lower of the charger's power and the car's own limit: many EVs accept 7–11 kW on AC, so a 22 kW charger is no faster for them. On DC fast chargers, the calculator uses an average of about 70% of the peak power, which is typical when charging from about 10% to 80%.

Cold batteries, a busy charging site that shares power between cars, or charging above 80% all make real-world charging slower.

How many miles per hour does a Level 2 charger add?

Usually about 20–40 miles per hour, depending on the charger (7–11.5 kW) and the car's efficiency. A Level 1 household outlet adds only around 3–5 miles per hour.

Why doesn't a 22 kW charger charge my car faster?

Most EVs can only accept 7–11 kW on AC. The car's onboard charger is the limit, so a more powerful AC charger makes no difference.

How much range does a DC fast charger add in 10 minutes?

Depending on the car and charger, often around 40–100 miles (65–160 km) when the battery starts low. Fast-charging cars on 250–350 kW chargers can add even more.