How the EV charging time calculator works
Charging time is the energy you need to add divided by how fast the charger delivers it. Enter your battery size, the charge window, and your charger power in kilowatts, and the calculator works out the hours and minutes — adjusted for charging efficiency, since not all the wall power reaches the battery.
Charger levels and typical speeds
- Level 1 — a standard household outlet, about 1.4 kW. Fine overnight for a plug-in hybrid, slow for a full EV (days for a big pack).
- Level 2 — a 240-volt home or public unit, typically 7 to 11 kW. The everyday sweet spot; a full charge overnight.
- DC fast charging — public rapid chargers from 50 kW to 350 kW. Minutes, not hours, but used mainly for trips.
Why fast charging slows down after 80%
DC fast chargers hold a high rate only while the battery is fairly empty, then taper sharply to protect the cells. That is why going from 10% to 80% is quick but the last 20% can take as long as the first 60%. For trip planning, charge to 80% and move on. This calculator gives the average linear estimate; real fast-charge sessions front-load the speed.
Charging time and cost together
Time tells you how long to wait; cost tells you what the session adds to your bill. Pair this with the EV Charging Cost Calculator to see both for the same charge window.
Frequently asked questions
Does the calculator account for the 80% taper?
No — it gives a steady-rate estimate, which is accurate for Level 1 and Level 2 charging. For DC fast charging, expect the real time past 80% to run longer than shown.
What charger power should I enter?
Use your charger or vehicle onboard charger rating, whichever is lower — the car can only accept as fast as its onboard charger allows on AC.
Why is my real charge slower than the estimate?
Cold batteries, a nearly full pack, and a vehicle onboard charger limit lower than the station rating all slow things down.