EV Charging Cost Calculator

Enter your numbers below. The defaults use typical US values (about 17¢ per kWh at home and $3.30 per gallon of gas) — change them to match your utility bill and your car.

Battery size (kWh) Charge from (%) Charge to (%) Electricity price ($ per kWh) Efficiency (miles per kWh) Miles you drive per month Gas car to compare (MPG) Gas price ($ per gallon)

How the calculation works

1. Energy added = battery size × (charge to % − charge from %).
2. Energy from the grid is about 10% higher than what goes into the battery, because home (Level 2) charging loses some energy as heat.
3. Cost per charge = grid energy × your electricity price.
4. Cost per mile = electricity price ÷ 0.9 ÷ your car's efficiency in miles per kWh.

Typical values

Item	Typical US range
Home electricity	12¢–35¢ per kWh (varies a lot by state)
DC fast charging	40¢–60¢ per kWh
EV efficiency	2.5–4.5 miles per kWh
Battery size	50–100 kWh for most cars

Your exact rate is on your utility bill — look for the price per kWh including delivery charges. If your utility offers a time-of-use plan, charging overnight can cut the cost significantly.

FAQ

Is it cheaper to charge at home or at a fast charger? Home charging is almost always cheaper — often a third of the price of DC fast charging per kWh.

Why charge to 80% instead of 100%? Many manufacturers recommend 80% for daily use to reduce battery wear. Charging to 100% occasionally for long trips is fine.

Results are estimates for information only.