Charging an electric car at home can cost as little as 2–5 cents per mile. That’s not marketing copy — it’s what most EV owners actually pay.
But if you’re considering a used electric car and you’re not sure what your electricity bill will look like, the numbers floating around online can feel confusing. Some sites give you best-case scenarios. Others bury the real costs in footnotes. This guide gives you both the headline figures and the honest detail — so you can calculate what you’ll actually pay based on where you live and how much you drive.
What Does It Really Cost to Charge an Electric Car at Home?
Let’s start with the numbers most people are searching for.
In the US, the average home charging cost sits at roughly $0.03–$0.05 per mile, based on a national average electricity rate of around $0.16 per kWh. For a typical EV with a 60 kWh battery, a full home charge costs somewhere between $8 and $12.
In the UK, a full charge on a standard home tariff costs roughly £4–£15, depending on your car’s battery size and your energy rate. If you’re on an off-peak or overnight tariff, that figure drops to around £3–£6 per charge.
Most EV owners spend $35–$60 per month on home charging in the US, and £30–£80 per month in the UK — depending on how far they drive. Annually, UK drivers typically pay £200–£800 in home charging costs.
That’s the quick summary. The sections below explain how those numbers are calculated and how yours might differ.
Average Home Charging Cost: Per Mile, Per Charge, Per Month
The cleanest way to understand EV running costs is to break them into three layers.
Cost per mile is the most useful metric for day-to-day comparison with petrol. In the US, most EVs cost 2–5 cents per mile to charge at home. For reference, a petrol car averaging 30 mpg costs around 11–15 cents per mile at current fuel prices. That’s a significant gap.
Cost per full charge depends entirely on two things: your battery size and your electricity rate. A smaller EV like a Nissan Leaf (40 kWh battery) costs around $6.40 to fully charge at $0.16/kWh. A Tesla Model 3 Long Range (82 kWh battery) costs closer to $13.10 for a full charge at the same rate.
Monthly and yearly costs depend on how much you drive. The average American drives about 1,000–1,200 miles per month. At 3–4 cents per mile, that’s $30–$50/month — or $360–$600/year.
| Metric | US Estimate | UK Estimate |
|---|---|---|
| Cost per mile | $0.03–$0.05 | £0.04–£0.08 |
| Full charge (60 kWh) | ~$9.60 | ~£9–£16 |
| Monthly cost | ~$35–$60 | ~£30–£80 |
| Annual cost | ~$420–$720 | ~£200–£800 |
Based on the US avg $0.16/kWh and the UK avg ~25p/kWh on the standard tariff.
How to Calculate Your Exact Charging Cost
The formula is simple:
Charging cost = Battery size (kWh) × Electricity rate (per kWh)
So if your car has a 60 kWh battery and you pay $0.14/kWh, a full charge costs:
60 × $0.14 = $8.40
For cost per mile, divide the full charge cost by your car’s real-world range:
$8.40 ÷ 250 miles = $0.034 per mile
One thing most articles skip: charging efficiency. Not all the electricity drawn from the wall actually makes it into your battery. Level 1 and Level 2 home chargers typically have an efficiency of 85–90%, which means you’ll use slightly more electricity than the battery’s stated capacity. A 60 kWh charge may actually draw 65–68 kWh from the grid. Factor that into your real-world cost — it adds around 10–15% to the figure you’d calculate from battery size alone.
Factors That Affect Home Charging Costs
Your actual monthly bill will depend on more than just the rate per kWh.
Electricity Rate
The electricity rate is the biggest variable. US rates range from around $0.10/kWh in states like Louisiana to over $0.30/kWh in California and Hawaii. UK rates vary too — standard tariffs currently sit around 24–28p/kWh, while off-peak EV tariffs can drop to 7–12p/kWh overnight.
Battery Size
Battery size directly sets your cost-per-charge ceiling. A 40 kWh battery always costs less to fill than an 82 kWh battery — even if the per-mile cost ends up similar, because the larger battery car typically has more range.
Driving Habits
Driving habits affect how often you charge, not just how much each session costs. If you drive 600 miles a month, you’ll spend roughly half what someone doing 1,200 miles pays — regardless of the car.
Time of Use
Time of Use is one of the most underused cost controls available. In both the US and UK, some energy tariffs offer significantly lower rates during off-peak hours (typically midnight–6am). Charging overnight on one of these plans can cut your per-kWh rate by 30–60%.
Used EV vs Petrol: How the Costs Compare
This is where the numbers become genuinely compelling.
A petrol car averaging 35 mpg costs around $0.11–$0.14 per mile in the US (based on ~$3.50–$4/gallon). In the UK, a car doing 40 mpg costs around 18–22p per mile at current fuel prices.
Compare that to an EV at $0.03–$0.05/mile in the US or 4–8p/mile in the UK on a standard tariff — and the gap is substantial.
| Vehicle Type | US Cost/Mile | UK Cost/Mile |
|---|---|---|
| Petrol/Diesel (avg) | $0.11–$0.14 | 18–22p |
| EV (standard tariff) | $0.03–$0.05 | 6–8p |
| EV (off-peak tariff) | $0.02–$0.03 | 3–5p |
For someone driving 12,000 miles a year, the annual fuel saving from switching to a used EV ranges from roughly $1,000–$1,400 in the US and £800–£1,200 in the UK. EVs are generally 40–70% cheaper per mile to run than petrol equivalents.
A used EV makes this comparison even more attractive — you’ve reduced the purchase price significantly, so the break-even point on running cost savings arrives much sooner.
Hidden Costs Most Owners Miss
The per-mile cost is low, but there are a few upfront and ongoing expenses worth knowing before you commit.
Home charger installation is the most significant one. While you can use a standard three-pin plug (Level 1 charging), it’s slow — adding only 3–5 miles of range per hour. A dedicated Level 2 home charger is far more practical, and installation in the US typically costs $800–$2,500 for the unit and wiring, though some installations in older homes run higher. In the UK, a home charge point unit and installation costs around £800–£1,200, though government grants have historically offset some of this.
Energy losses are real but small. As noted above, expect to pay for about 10–15% more electricity than your battery’s stated capacity due to conversion losses in the charging process.
Tariff differences matter more than most new EV owners realise. If you sign up to a dedicated EV electricity tariff in the UK (such as Octopus Go or similar), you can charge at 7–12p/kWh overnight rather than 24–28p/kWh on a standard tariff. That’s a difference of up to 60% — and over a year, it can save you £200–£400.
How to Reduce Your Home Charging Cost
There are three practical ways to lower your per-charge cost without much effort.
Charge overnight on an off-peak tariff. In both the US and UK, time-of-use electricity plans charge less during off-peak hours. Setting your car to charge between midnight and 6:am is the single most effective cost-reduction move available to most EV owners.
Get a smart charger. A smart home charger lets you schedule charging times automatically, so your car tops up during cheap-rate hours without you having to think about it. Most modern Level 2 chargers have this built in.
Consider solar panels if you own your home. If you generate solar electricity during the day, you can use it to charge your EV — taking your per-mile fuel cost close to zero during sunny months. The upfront cost of solar is significant, but over 10 years, the combination of reduced electricity bills and near-free EV charging makes it one of the better financial decisions for high-mileage EV drivers who own their property.
Real-World Example: A Used EV Owner’s Monthly Costs
Take a practical scenario: someone in the US buys a used 2020 Nissan Leaf with a 40 kWh battery. They drive about 900 miles per month and pay $0.15/kWh on a standard home tariff.
Their monthly charging cost works out like this:
- 900 miles ÷ 3.5 miles/kWh = ~257 kWh used per month
- 257 kWh × $0.15 = $38.55/month
- At $0.11/kWh off-peak: $28.27/month
Compare that to their previous petrol car, doing 32 mpg at $3.60/gallon:
- 900 miles ÷ 32 mpg = 28.1 gallons
- 28.1 × $3.60 = $101.16/month
The monthly savings: $62–$73, depending on the tariff. Over a year, that’s $740–$876 back in their pocket — just on fuel.
Now factor in that this used Leaf cost them around $12,000–$15,000 rather than $25,000+ for a new EV. The savings from using an electric car here aren’t marginal. They’re material.
Final Verdict: Is Home Charging Actually Cheap?
Yes — with one honest caveat.
The per-mile running cost for a used electric car charged at home is genuinely low. In most parts of the US and UK, you’ll pay 2–8 cents (or pence) per mile, compared to 11–22 cents for a petrol car. Monthly bills of $35–$60 or £30–£80 are realistic for average drivers, and annual costs of £200–£800 in the UK are well-documented.
The caveat is that upfront charger installation adds $800–$2,500 to your first-year costs, and high electricity tariffs in some regions (particularly California and parts of the UK) can narrow the gap. If you’re in a high-rate area and don’t have access to off-peak tariffs, do the maths before assuming you’ll save as much as the headline figures suggest.
But for the majority of used EV buyers — especially those who can charge overnight on a cheaper tariff — the home charging cost electric car equation works strongly in their favour. The real cost, once you run the numbers, is usually much lower than people expect. That’s not a sales pitch. It’s just what the data shows.
Want to see what you’d pay? Use our EV cost calculator to enter your car’s battery size, your electricity rate, and your monthly mileage — and get your personal estimate in under a minute.