EV Charging Cost and Time Calculator
Calculate EV charging cost and time from battery size, charge level, charger power, and your electricity rate. Compare home and public charging prices.
Vehicle and charge
kWh
%
%
%
%
Charging equipment power
kW
kW
kW
kW
kW
Enter average DC power at the battery for this charge range to estimate time. Leave it blank to see only an ideal lower bound from peak ratings.
Electricity prices
USD/kWh
USD/kWh
USD/kWh
USD
Optional driving cost
Compare electricity cost over a distance using battery use or an EPA label value.
Charge energy and time
Energy stored in battery
36 kWh
Home energy from the grid
40 kWh
Public energy billed at connector
37.89 kWh
AC charging time estimate
6 hr 40 min
DC ideal lower bound at peak power
0 hr 18 min
Cost for this charge
Home at peak rate
$12.00
Home at off-peak rate
$8.00
Public energy
$17.05
Public session fee
$1.50
Public total
$18.55
Use this EV charging cost calculator to estimate the cost and time for a battery charge at home or at a public charger. Enter your usable battery size, starting and target charge levels, charger power, charging efficiency, and electricity rates. Compare home peak and off-peak prices with a public per-kWh rate and session fee. The estimates use your inputs; they are not live tariff quotes or vehicle-specific charge-curve predictions.
How to Use EV Charging Cost and Time Calculator
Enter battery size and charge levels
Enter the usable battery capacity in kWh, then set the current and target battery charge percentages. The calculator estimates the energy for that part of the charge, rather than assuming every session starts at 0% or ends at 100%. If your vehicle lists both gross and usable capacity, use the usable figure.
Set charger power to estimate charging time
For an AC charging time estimate, enter the station output and your vehicle’s onboard AC charging limit. The lower power is used. For DC fast charging, enter the average power delivered to the battery over your selected charge range. If you only know the charger and vehicle peak ratings, the calculator shows an ideal lower bound—not a predicted session time.
Compare home and public charging prices
Enter the per-kWh prices from your electricity bill and public charging network. Home peak and off-peak prices are separate whole-session scenarios. Add the public charger’s fixed session fee if it has one. This calculator does not split a session across changing time-of-use rates or fetch live prices.
Check the charging loss assumptions
Home electricity use is calculated from energy stored in the battery and your wall-to-battery efficiency. Public billed energy uses its own connector-to-battery efficiency. Keep these assumptions separate because the home meter and public charger can measure energy at different points.
Calculator Features
Partial-charge energy
Estimate how many kWh a chosen starting and target battery percentage requires.
AC charging time and DC guidance
Estimate AC time using the station and onboard charging limits; distinguish a DC average-power estimate from an ideal peak-power lower bound.
Home versus public charging cost
Compare home peak, home off-peak, and public charging using your own electricity prices and session fee.
Cost per mile or kilometre
Estimate electricity cost over a chosen distance using battery consumption or an EPA label value.
Complete Function List
- Usable battery and start/target state-of-charge inputs
- Separate home and public charging efficiency assumptions
- AC time estimate limited by station and onboard charger power
- DC estimate using average power and peak-power ideal lower bound
- Home peak/off-peak and public charging cost breakdown
- Optional EV electricity cost per mile or kilometre
- Selectable display currency with no exchange-rate conversion
Common Calculations & Examples
Example 1: Home versus public cost for a 20% to 80% charge
Problem: For an example only, use a 60 kWh usable battery, 20% starting charge, 80% target, 90% home charging efficiency, and a 6 kW vehicle onboard limit. Assume home electricity costs $0.20/kWh off-peak and $0.30/kWh at peak. For public charging, use 95% connector-to-battery efficiency, $0.45/kWh, and a $1.50 session fee. These are sample prices, not current local tariffs.
Steps:
- The battery needs 60 × (80 − 20) / 100 = 36 kWh of stored energy.
- At 90% home efficiency, the meter supplies 36 / 0.90 = 40 kWh. At $0.20/kWh off-peak, the energy costs $8; at $0.30/kWh peak, it costs $12.
- At a public charger with 95% efficiency, about 36 / 0.95 = 37.89 kWh is billed. At $0.45/kWh plus the $1.50 session fee, the example total is about $18.55.
- A 7.2 kW AC station is limited by the car’s 6 kW onboard charger, giving an estimated AC time of 40 / 6 = 6 hours 40 minutes.
Explanation: This comparison uses the same battery charge range for each price scenario. It assumes constant AC power and the stated efficiency values; real charging and prices vary. Replace the sample rates with your own bill or charger prices.
Example 2: Estimate home electricity cost per 100 miles
Problem: Suppose your EV uses 30 kWh per 100 miles according to its EPA label and your home electricity rate is $0.20 per kWh.
Steps:
- Multiply 30 kWh by $0.20/kWh to get $6 per 100 miles.
- Divide by 100 to get an estimated 6 cents per mile.
Explanation: EPA label energy consumption already reflects Level 2 charging losses, so this calculation does not apply the home charging efficiency a second time.