EV Charging Cost Calculator

Five inputs, all easy to find in five minutes:

1. Battery size (kWh). Your EV’s usable battery capacity. The owner’s manual or the model’s EPA window-sticker page on fueleconomy.gov has this. Common values: Tesla Model 3 Long Range 82 kWh, Tesla Model Y Long Range 81 kWh, Chevy Bolt EUV 65 kWh, Nissan Leaf S 40 kWh / Plus 62 kWh, Hyundai Ioniq 5 77 kWh, Ford F-150 Lightning Standard 98 kWh / Extended 131 kWh.
2. Electricity rate ($/kWh). Pull your most recent utility bill and look for the line labeled “price per kWh,” “energy charge,” or “supply rate.” If you’re on a time-of-use plan, use your off-peak rate — smart EV owners schedule overnight charging when rates are lowest. Many utilities now offer special EV-only rate plans worth a phone call to ask about.
3. Charge per session (% of battery). The amount of battery you replenish in a typical plug-in. If you drive 40 miles a day and your car covers 300 per full charge, you’re consuming about 13% per day — but most people plug in every 2–3 days and add 30–50% at a time. The default of 80% works for daily-charger owners; drop it to 50–60% if you charge less frequently with smaller top-ups.
4. Charges per week. Plug-in frequency. A 30-mile-each-way commuter might plug in every weeknight (5×/week). A short-commute driver who works from home may charge 2–3 times per week. Long-haul winter drivers in cold climates may need to plug in nightly.
5. Efficiency (miles per kWh). Real-world driving efficiency, not the EPA sticker number. Most cars display a lifetime average somewhere in the dashboard menus. Typical values: Tesla Model 3 ~4.0 mi/kWh, Chevy Bolt ~3.5, midsize EV SUVs (Model Y, Ioniq 5) ~3.0–3.3, full-size EV trucks ~1.8–2.5. Numbers are 15–30% lower in winter, 5–10% higher in summer.

Results show your cost per charge session, the monthly and annual running totals, your effective cost per mile, and the kWh consumed per session — useful for comparing your draw to what your home electrical panel can handle.

If you’ve been driving electric for a few months, the question shifts from “how much does an EV cost to run?” to “wait, exactly how much of my electric bill is the car?” This calculator answers that. Enter your battery size, your home electricity rate, and how often you plug in, and it returns your cost per charging session, monthly charging bill impact, annual total, and effective cost per mile — the single number that lets you compare apples-to-apples against the gas car you used to drive.

For most U.S. drivers, the math comes out heavily in the EV’s favor. The U.S. average residential electricity rate as of early 2026 is about $0.16 per kWh, and a typical EV gets 3.0–4.0 miles per kWh in real-world driving. That works out to roughly $0.04–$0.05 per mile. A 30-mpg gas car at $3.50/gallon costs about $0.117 per mile — more than double. Over 12,000 miles per year, the EV saves around $850.

The savings shrink (or even disappear) in two scenarios. High-rate states like Hawaii ($0.40+/kWh) and parts of California ($0.30+/kWh) push EV cost-per-mile into the $0.08–$0.13 range, much closer to gas. Heavy reliance on DC fast chargers (Tesla Superchargers, Electrify America, EVgo) typically costs $0.30–$0.55/kWh, sometimes pushing per-mile cost above gas equivalents. The math always works best when you can charge at home overnight on standard residential rates — or, even better, on an EV-specific time-of-use plan that offers off-peak rates as low as $0.05–$0.08/kWh.

This calculator focuses specifically on home Level 1 and Level 2 charging. It does not include public charging, demand charges some utilities apply to EV chargers above certain power levels, or charger installation costs (typically $500–$2,000 for a Level 2 240V circuit). What it does capture is the day-to-day cost of running the vehicle off your wall outlet, which is where 80–90% of EV charging actually happens for the average owner.

One reality the calculator cannot model: seasonal range loss. EVs typically lose 20–40% of their range in below-freezing temperatures because lithium-ion batteries are less efficient when cold and because cabin heating draws meaningful power. If you live somewhere with real winters, expect your monthly charging cost to rise 20–30% from December through February even if your driving habits don’t change. Adjust your charges-per-week slider upward in winter for a more realistic full-year estimate.

Disclaimer: This is an educational estimate. Actual electricity rates vary by season, time of day, utility, and rate plan. Consult your utility bill or a smart-meter dashboard for precise figures, and consider an energy audit before installing a Level 2 charger if you have older home wiring.

Five formulas, all simple multiplication:

• Energy per session: E_s = B × c
• Cost per session: E_s × r
• Monthly cost: Cost per session × n × 4.345 (average weeks per month)
• Annual cost: Cost per session × n × 52
• Cost per mile: r ÷ e

The 4.345 weeks-per-month constant comes from 365.25 ÷ 7 ÷ 12 = 4.348, rounded slightly. Annualizing as ×52 weeks gives a 0.7% understatement compared to a true 365.25-day year — close enough for budgeting purposes.

One nuance the simple formula glosses over: charging losses. Real-world charging is 85–95% efficient depending on the charger, ambient temperature, and battery state of charge. The kWh that comes out of your wall is slightly more than the kWh that actually ends up in your battery. For a quick sanity-check on your monthly bill: if this calculator predicts $90/month and your actual electric bill rises by $100–$105 after switching to EV, that’s charging-loss overhead, not a calculation error.

The calculator also assumes constant electricity rates and constant driving habits across the year. Both vary in reality — electricity rates often shift in summer (higher demand) and EVs use 20–30% more energy per mile in winter. For a more pessimistic annual estimate, multiply the result by 1.10–1.15.

Example 1: Tesla Model 3 in Texas
Battery: 82 kWh | Rate: $0.12/kWh | Charge: 70% per session | 4 charges/week | 4.0 mi/kWh
Energy per session: 82 × 0.70 = 57.4 kWh
Cost per session: 57.4 × $0.12 = $6.89
Monthly cost: $6.89 × 4 × 4.345 = $119.80
Cost per mile: $0.12 ÷ 4.0 = $0.030/mile

Example 2: Ford F-150 Lightning in California
Battery: 131 kWh | Rate: $0.28/kWh | Charge: 60% per session | 3 charges/week | 2.5 mi/kWh
Energy per session: 131 × 0.60 = 78.6 kWh
Cost per session: 78.6 × $0.28 = $22.01
Monthly cost: $22.01 × 3 × 4.345 = $287.05
Cost per mile: $0.28 ÷ 2.5 = $0.112/mile

Example 3: Nissan Leaf in the Midwest
Battery: 40 kWh | Rate: $0.14/kWh | Charge: 90% per session | 5 charges/week | 3.2 mi/kWh
Energy per session: 40 × 0.90 = 36.0 kWh
Cost per session: 36.0 × $0.14 = $5.04
Monthly cost: $5.04 × 5 × 4.345 = $109.49
Cost per mile: $0.14 ÷ 3.2 = $0.044/mile