EV Home Charging Cost Calculator
Example: Usable battery size: 75 kWh · Charge added per session: 60 % · Electricity price: 0.16 $/kWh · Charging sessions per week: 3 per week · Charging efficiency: 88 %
| Cost per charging session | $8 |
| Monthly charging cost | $106 |
| Annual charging cost | $1,276 |
| kWh drawn per session | 51.14 |
Worked example
Adding 60% to a 75-kWh battery puts 45 kWh into the pack. At 88% charging efficiency you actually pull about 51 kWh from the wall. At $0.16 per kWh that is about $8.18 per session. Charging three times a week is roughly $1,277 a year, or about $106 a month. Even at a higher-than-average electricity rate, that is a fraction of what the same driving would cost in gasoline.
Frequently asked questions
Why include charging efficiency?
Some energy is lost as heat in the charger, cables, and battery, so you draw more from the wall than ends up in the pack. Level 2 home charging is commonly around 85 to 90% efficient, so accounting for it makes the cost realistic rather than optimistic.
How do I find my electricity rate?
Check the per-kWh rate on your utility bill. If you are on a time-of-use plan, use your off-peak overnight rate, since most home charging happens at night and can be much cheaper than the peak rate.
Is home charging always cheaper than public charging?
Almost always. Public DC fast charging can cost two to three times your home rate per kWh. This tool models home charging; for public charging, substitute the network per-kWh price to compare.
How does this compare to gas?
To compare, divide your annual charging cost by miles driven and set it against a gas car fuel cost per mile. In most regions home charging comes out well ahead, which a dedicated EV-vs-gas calculator can quantify.