SolarToolsHow This Tool Works
The EV Charging Cost Calculator tells you exactly how much you'd save by switching from a petrol, diesel, or hybrid vehicle to an electric one. It compares cost-per-mile between electricity and liquid fuel, projects annual and five-year savings, and accounts for the real-world efficiency of EVs — which varies wildly depending on driving style, weather, and whether you charge at home or at public DC fast chargers.
The headline number is annual savings, but the more useful figures are the per-mile costs. A typical EV charged at home at $0.16/kWh and getting 3.5 mi/kWh costs about $0.046/mile in fuel. A 30-mpg petrol car at $3.50/gallon costs $0.117/mile. That 2.5× difference is the entire economic case for EVs, and it holds across most of the world — even in countries with expensive electricity, liquid fuel is usually more expensive per mile.
The calculator also surfaces two often-ignored costs. First, public DC fast charging is typically 3–4× more expensive than home charging, so drivers who can't charge at home see much smaller savings. Second, cold weather cuts EV efficiency by 20–35%, which matters in winter-heavy climates. Use the annual miles field honestly — if you only drive 6,000 miles/year, the savings shrink proportionally.
For the full picture including purchase price, depreciation, and maintenance, pair this tool with the Electricity Bill Estimator to see how the extra home charging load affects your electricity costs.
- Enter your EV's battery capacity in kWh. Check the manufacturer spec. Common values: Chevy Bolt 60, Tesla Model 3 LR 75, Hyundai Ioniq 5 77, Ford F-150 Lightning 98.
- Be honest about efficiency. EPA-rated efficiency is optimistic. Real-world: 2.5–3.0 for trucks and SUVs, 3.5–4.0 for sedans, 4.0–5.0 for efficient small EVs. Winter drops this 20–35%.
- Use your home electricity rate. Public DCFC at $0.40–0.60/kWh wipes out most of the savings. If you can't charge at home, your economics are very different.
- Set fuel price to your local pump price. US avg ~$3.50, UK ~£6/gallon equiv, SA ~R22/liter.
- Set comparison MPG to a realistic vehicle. Comparing a Model 3 to a 20-mpg truck is unfair; comparing to a 50-mpg Prius is the honest test.
The 5-year savings number is the one to circle. Most people keep cars 6–8 years; 5 years is conservative. The savings usually exceed any price premium the EV carries over the equivalent petrol car.
When to Use This Calculator
The per-mile math, exactly
For an EV: cost_per_mile = electricity_rate / efficiency_in_mi_per_kWh. At $0.16/kWh and 3.5 mi/kWh, that's $0.046/mile. For petrol: cost_per_mile = fuel_price / mpg. At $3.50/gallon and 30 mpg, that's $0.117/mile. The savings per mile is $0.071. Over 13,000 miles/year, that's $923/year. Over 5 years, $4,615. That's the math — there's nothing hidden.
Why home charging is everything
Public DC fast charging in the US typically runs $0.40–0.60/kWh. At $0.50/kWh, the EV costs $0.143/mile — more than the 30-mpg petrol car at $3.50/gallon. Drivers who rely on public charging do not save money versus petrol. The economic case for EVs is fundamentally a home-charging case. If you rent, can't install a charger, or live in an apartment without dedicated parking, the math changes completely.
Time-of-use makes it better
Many utilities offer EV time-of-use plans with overnight rates of $0.08–0.12/kWh, versus $0.20–0.35 peak. Charging 11pm–6am cuts charging costs by 40–60%. If you can enroll in such a plan, enter that overnight rate in the calculator — the savings compound. See the Time-of-Use Optimizer to design a full overnight load-shifting strategy.
Winter efficiency loss
Cold weather affects EVs in three ways: battery chemistry is less efficient at low temperatures, cabin heating draws 3–5 kW from the same battery, and tire rolling resistance increases. Real-world data shows 25–35% efficiency loss at 0°C (32°F) versus 20°C (68°F). If you live in a cold climate, drop your efficiency input by 30% in the calculator to get a realistic annual average.
Hidden savings: maintenance
EVs have no oil changes, no spark plugs, no transmission fluid, regenerative braking extends pad life to 100k+ miles, and there's no exhaust system to rust. Independent studies (Consumer Reports, AAA) put EV maintenance costs at roughly half those of petrol vehicles — about $0.06/mile vs $0.10/mile. Over 13k miles/year that's another $520/year not counted in this calculator. Add it in your head.
Frequently Asked Questions
For a 75 kWh battery at $0.16/kWh, a full charge costs $12. For a typical 30-mile daily commute using about 9 kWh, that's $1.40/day. Compare that to a 30-mpg petrol car at $3.50/gallon: same commute costs $3.50/day.
Usually not. At $0.40–0.60/kWh, a 3.5 mi/kWh EV costs $0.11–0.17/mile — comparable to or more expensive than a 30-mpg petrol car at $3.50/gallon. The savings case for EVs is fundamentally a home-charging case.
For 13,000 miles/year at 3.5 mi/kWh and $0.16/kWh, expect about $594/year or $50/month. This is far less than the $1,500+ you'd spend on petrol for the same distance.
Yes, if your utility offers one and you can charge overnight. TOU EV plans often drop overnight rates to $0.08–0.12/kWh, saving 30–50% versus flat rates. The Time-of-Use Optimizer tool helps design the full strategy.
Yes, but less. Winter efficiency drops 25–35%, so annual savings drop proportionally. In very cold regions the savings can be 40–50% lower than the calculator's default assumes — still positive, just less dramatic.
Further Reading
Deep-dive articles and guides related to this calculator.
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