1
Auto & Vehicle
EV Charging Cost Calculator — Cost to Charge an Electric Car
What it really costs to charge an EV at home vs. a public DC fast charger
The biggest reason people switch to an electric car is the running cost — and the question every new EV owner asks is the same: how much does it cost to charge? This EV charging cost calculator answers it in one step. You enter your battery size in kilowatt-hours (kWh), the charge level you're starting from and charging up to, and your electricity rate in cents per kWh, and it returns the dollar cost of that charge, the energy pulled from the wall, the range you'll add, and your cost per mile. It even prices the same charge at a home rate versus a public DC fast-charging rate so you can see the gap.
The math is nothing like a gas pump — EVs are billed in kilowatt-hours, not gallons:
Energy into the battery = battery kWh × (target% − start%) ÷ 100
Energy from the wall = energy into the battery ÷ charging efficiency
Cost to charge = energy from the wall × your rate per kWh
That middle step — dividing by efficiency — is the part most online estimates skip, and it's why your power bill is higher than a naïve calculation suggests. Charging is not 100% efficient. Energy is lost as heat in the cable, the onboard charger and the battery itself. At home on a Level 2 charger you lose roughly 10% (about 90% efficient); on a slow Level 1 outlet the loss is larger. This calculator builds that loss in by default.
A worked example: a 75 kWh battery charging from 0% to 80% puts 75 × 0.80 = 60 kWh into the pack. Divide by 90% efficiency and you actually pull about 66.7 kWh from the wall. At a U.S. home rate of $0.16/kWh, that charge costs roughly $10.67. If the car travels 3.5 miles per kWh, those 60 kWh add about 210 miles of range — about $0.05 per mile, less than half the cost of a 30-MPG gas car at $3.50/gallon.
Where you charge matters most: home power averages about 16¢/kWh, but public DC fast chargers often run 40–60¢/kWh — three to four times more. Time-of-use rate plans and cold weather move the number too, which is why this calculator shows home, peak and fast-charging prices side by side. It owns the electric side of driving costs — the EV companion to a fuel cost calculator for gas trips and a gas mileage calculator for MPG. The figures here are an estimate for planning, not financial advice; your real cost depends on charging losses, weather, your utility's rate plan and any per-minute fees at public chargers.
📖 See also: How to Calculate Your Car Payment
Calculator
Fill in the fields and click "Calculate" for instant results.
📰 Formula
• Energy into battery (kWh) = battery kWh × (target% − start%) ÷ 100 • Energy from the wall (kWh) = energy into battery ÷ charging efficiency (≈ 0.90 for ~10% loss) • Cost to charge = energy from the wall × rate per kWh • Range added (miles) = energy into battery × miles per kWh • Cost per mile = cost to charge ÷ range added
📰 Formula
• Energy into battery (kWh) = battery kWh × (target% − start%) ÷ 100 • Energy from the wall (kWh) = energy into battery ÷ charging efficiency (≈ 0.90 for ~10% loss) • Cost to charge = energy from the wall × rate per kWh • Range added (miles) = energy into battery × miles per kWh • Cost per mile = cost to charge ÷ range added
🧪 Worked examples
2
Example 2
3
Example 3
4
Example 4
⚠️ Common mistakes
- Ignoring charging losses — your wall draw is about 10% higher than the energy that reaches the battery, so the bill is higher than battery kWh × rate.
- Entering the rate in dollars instead of cents per kWh (use 16 for 16¢, not 0.16).
- Using the home rate to price a public DC fast charge, which often costs three to four times more per kWh.
- Confusing battery size with charge added — a 0→80% charge is 80% of the pack, not the whole battery.
- Forgetting that cold weather lowers both efficiency and range, so a winter charge buys fewer miles.
💡 Tips
- Charge to about 80% for daily driving — it's faster, cheaper per mile and easier on the battery; save 100% for road trips.
- Find your real rate on your electric bill (price per kWh); if you have a time-of-use plan, use the off-peak overnight number.
- Home charging at ~16¢/kWh is usually less than half the cost per mile of gas — lean on it and treat DC fast charging as a road-trip tool.
- Cost per mile (cost ÷ range added) is the cleanest way to compare your EV against a gas car's cents-per-mile.
- On a DC fast charger, stopping around 80% is often cheaper overall because charging slows sharply above that point.
Embed this calculator on your site
Copy the code below and paste it into the HTML of your site or blog.
<iframe src="https://www.calcnimbus.com/embed/ev-charging-cost-calculator" width="100%" height="500" frameborder="0" style="border:1px solid #eee;border-radius:12px"></iframe>
❓ Frequently asked questions
How much does it cost to charge an electric car at home?
Multiply the energy you add by your rate, allowing for ~10% charging loss. A 75 kWh battery charged 0→80% puts 60 kWh in the pack and pulls about 66.7 kWh from the wall; at the U.S. home average of 16¢/kWh that's roughly $10.67.
How do I calculate the cost to charge my EV?
Cost = battery kWh × (target% − start%) ÷ 100 ÷ charging efficiency × rate per kWh. The divide-by-efficiency step (about 0.90) accounts for energy lost as heat during charging, which raises the bill above battery size × rate.
What is the cost per mile to drive an electric car?
Divide the cost to charge by the range it adds. 60 kWh at 3.5 miles per kWh adds about 210 miles; if that charge cost $10.67, that's about $0.05 per mile — roughly half the cost of a 30-MPG gas car at $3.50 a gallon.
Why is my charging bill higher than battery size times my rate?
Because charging isn't 100% efficient. Energy is lost as heat in the cable, onboard charger and battery — about 10% on a home Level 2 charger and more on a slow Level 1 outlet. You pay for the energy from the wall, not just what reaches the battery.
How much more does public DC fast charging cost than home charging?
Usually three to four times more. Home power averages about 16¢/kWh, while public DC fast chargers commonly run 40–60¢/kWh, and some bill per minute. Charge at home when you can and treat fast charging as a road-trip convenience.
Should I charge my EV to 80% or 100%?
For daily driving, 80% is the sweet spot — it charges faster, costs less per session and reduces battery wear. Charge to 100% before a long trip when you need the full range. Many EVs let you set a default charge limit at 80%.
How much does it cost to fully charge a Tesla?
Depends on the battery and your rate. A 75 kWh Model 3 Long Range from 0→100% pulls about 83 kWh from the wall after losses; at 16¢/kWh that's roughly $13.30 at home, or about $40 at a 48¢/kWh Supercharger. Enter your exact battery and rate above for your number.
Does charging cost change with a time-of-use electricity plan?
Yes, a lot. Time-of-use plans charge a low overnight rate and a high peak rate. Charging at 2 a.m. instead of during the evening peak can cut your cost roughly in half. Use your off-peak rate in the calculator if you charge overnight.
Why does cold weather make EV charging more expensive per mile?
Cold lowers both charging efficiency and driving range — the battery accepts charge more slowly and loses heat, and the car uses energy to warm the cabin and pack. The same kWh buys fewer miles in winter, raising your effective cost per mile.