Energy
Estimate the cost of charging an electric vehicle at home.
Enter your numbers to see the answer.
EV charging cost calculator guide
EV charging cost is the electricity required to add energy to the battery, adjusted for charging losses, multiplied by the rate that applies to the session. This page gives a clear home-charging estimate: enter battery capacity, the percentage of the battery you are adding, your electricity rate, and charging efficiency. It separates battery energy from grid energy so the result does not quietly assume perfect charging; the grid row is always larger than the battery energy because chargers, cables, and battery conditioning waste some power as heat. Public charging can add session, parking, subscription, or time-based fees, while home bills can include tiers, fixed charges, taxes, or time-of-use rates. Use the calculator for a transparent energy scenario, then compare it with your actual utility bill or charger receipt before treating it as a budget number.
Battery energy added (kWh) = battery capacity × charge added ÷ 100. Grid energy (kWh) = battery energy added ÷ (charging efficiency ÷ 100). Charging cost = grid energy × electricity rate.
Worked example with the defaults: a 75 kWh battery receiving an 80% charge adds 75 × 80 ÷ 100 = 60 kWh to the pack. At 90% charging efficiency the grid has to supply 60 ÷ 0.90 = 66.7 kWh, which the calculator shows as energy from the grid. At $0.16 per kWh the session costs 66.7 × $0.16 = $10.67, the per-charge figure the calculator displays. Charging from 20% to 80% instead is a 60 percentage-point change: 75 × 0.60 = 45 kWh in the battery, 45 ÷ 0.90 = 50 kWh from the wall, and 50 × $0.16 = $8.00.
Battery size is in kWh, charge added and efficiency are percentages, and the rate is currency per kWh. Enter 80 for an 80 percentage-point charge increase and 90 for 90% efficiency; the calculator performs the percentage conversion. Use a rate matching the location and time of charging, since off-peak EV tariffs are often half the daytime price.
The result is the estimated energy cost for one charging session. Multiply by realistic sessions per month for a planning budget, but keep public fees, fixed charges, and different peak/off-peak rates as separate scenarios. Charging time and electrical capacity are different questions; use the related time and charger-sizing tools for those.
Do not enter the dashboard’s finishing percentage as the charge added; the field wants the percentage-point change, so a 20%-to-80% top-up is 60, not 80. Do not assume 100% charging efficiency, because Level 2 home charging typically lands between 85% and 92% and Level 1 is lower. Do not use a monthly bill total as a per-kWh rate; divide the energy charge by the kWh used instead. Check whether a public provider charges for time or connection in addition to energy, and remember that cold-weather preconditioning draws power that never reaches the battery.
Charging rates, vehicle efficiency, weather, battery conditioning, and public-network fees vary. Verify the rate, efficiency assumption, and charger receipt before using the estimate for a purchase or financial decision.
Sources
How it works
Estimate the cost of charging an electric vehicle at home. This tool explains the calculation so you can adjust the assumptions to match your situation.
Worked example
With Battery size = 75 kWh · Charge added = 80 % · Electricity rate = 0.16 $/kWh · Charging efficiency = 90 % → $10.67 / charge (estimated home charging cost). Change an input above and this example updates with your numbers.
Common questions
Adding 80% of a 75 kWh pack puts 60 kWh in the battery. At 90% efficiency and $0.16 per kWh the grid supplies about 66.7 kWh and the session costs about $10.67; a full 0-to-100% charge at the same rate would cost roughly $13.33.
Charging losses occur in the onboard charger, wiring, battery conditioning, and the AC-to-DC conversion. Dividing energy added by efficiency estimates the grid energy drawn; at 90% efficiency every 9 kWh stored needs 10 kWh from the meter.
The base calculation covers energy cost only. Add session, per-minute, parking, subscription, or idle fees separately when the public network charges them, and use the network’s per-kWh price rather than your home rate.
Calculate a representative session, multiply by realistic sessions per month, and run separate rates for home, public, peak, and off-peak charging when they differ. Two $10.67 sessions a week is roughly $92 a month.
No. Battery size is the full capacity in kWh. Charge added is the percentage-point increase in the session, such as 60 for a 20% to 80% charge or 80 for the default scenario, and the calculator multiplies the two together.