Work out the cost to charge an EV at home per charge, per mile and per month from battery size, efficiency and electricity rate.
Estimate only — costs use the electricity rate and efficiency you enter, with no live pricing data.
About this tool
EV Home Charging Cost Calculator is a free, in-browser tool that shows what it really costs to charge an electric car at home. It reports the energy drawn from the wall for a charge, the cost of that charge, the cost per mile and an estimated monthly cost.
The energy pulled from the outlet is battery kWh × (endPct − startPct) ÷ 100 ÷ chargingEfficiency, because AC-to-battery losses mean you pay for more kWh than land in the pack; charge cost is that energy × your electricity rate. Cost per mile is rate ÷ (milesPerKWh × efficiency), and monthly cost is your monthly miles × cost per mile. Distinct from an EV charging time calculator, this tool answers the money question, not the how-long question.
Use it to budget home charging or compare it against gasoline: enter your battery size, the charge window you top up between, your car's efficiency in miles per kWh and your electricity rate. All figures are computed locally in your browser and nothing is uploaded.
Frequently asked questions
Why divide by charging efficiency?
Charging is not lossless: some energy is lost as heat in the cable, onboard charger and battery. At about 85–92% efficiency you draw roughly 8–18% more kWh from the wall than reach the battery, and you pay for all of it — so the cost uses the wall figure.
What should I enter for the charge window?
The start and end state of charge you normally top up between — for example 20% to 80%, the everyday range many owners use to protect battery life. The tool charges only for that difference, not a full 0–100% fill.
How do I find miles per kWh?
It is your car's driving efficiency: miles driven divided by kWh used, shown on the dashboard or window sticker (often 3–4 mi/kWh). If your car reports Wh per mile, divide 1000 by that number (250 Wh/mi = 4 mi/kWh).
Are these costs exact?
They are estimates based on the rate and efficiency you enter, with no live utility pricing. Time-of-use rates, temperature and driving style all shift real costs, so treat the output as a close planning figure. Everything runs in your browser.