What does it actually cost to fill up in your garage? Home charging is usually cheaper than public DC fast charging—but the number depends on kWh from the meter, your $/kWh rate, and when you plug in.
Benefits
- Translates kWh per charge into dollars using your real utility rate.
- Clarifies Level 1 outlet vs. Level 2 wallbox—same math, different session length.
- Shows how off-peak scheduling changes monthly cost without changing miles driven.
How it works
- Note kWh added per session from your EV app, charger, or home energy monitor.
- Apply your electricity rate—off-peak overnight if your tariff has time-of-use blocks.
- Multiply by charges per week or month for a household fuel budget you can compare to gas.
FAQ
How much does it cost to charge an electric car at home?
Cost = kWh × $/kWh. A typical 50 kWh session at $0.15/kWh is about $7.50. Smaller top-ups (15–20 kWh) often run $2–4 at the same rate. Use delivered kWh from the wall for bill accuracy.
Is home charging cheaper than gas?
Often yes at residential rates—especially off-peak. Compare $/kWh × kWh per mile to $/gallon ÷ mpg for your vehicle. Local fuel and electricity prices, plus charging losses, determine the break-even.
Does Level 2 cost more per kWh than Level 1?
The utility rate is the same per kWh; Level 2 delivers energy faster, not at a higher $/kWh. Losses may differ slightly by equipment, but total cost still follows kWh drawn × rate.
Technical specifications
- Cost: session_$ = kWh_delivered × rate_$/kWh.
- kWh source: charger display, OEM app, or submeter preferred over pack SOC delta.
- TOU: run separate calculations for peak and off-peak blocks.
- Related: EV charge-time for hours per session at your charger kW.
Per charge vs. monthly budget
Single-session cost helps you understand one plug-in event. Monthly budgeting multiplies average kWh per night by days charged and your effective rate. Families with two EVs should sum each vehicle's kWh—or use whole-home monitor data during charging windows.
Hidden line items on the bill
Energy charges are only part of the utility bill; fixed customer charges and demand fees (rare on residential) do not scale per kWh. For EV fuel comparisons, focus on marginal energy rate—the cents per kWh for the block when your car charges.