EV Charging Cost Calculator

Calculate EV charging time and cost at Level 1, Level 2, and DC fast charging. Compare electricity cost per charge and annual fuel savings vs gasoline.

Estimating real-world driving range instead?

This page calculates charging time and electricity cost. For range after temperature, speed, and climate adjustments, use the EV Range Calculator →

EV Battery Capacity (kWh)

Current Charge Level (%)

Target Charge Level (%)

Electricity Rate ($/kWh)

Charger Type

EV Efficiency (miles/kWh)

Gas Car MPG (for comparison)

Gas Price ($/gallon)

What is EV Charging Cost?

EV charging cost is the electricity expense to replenish your battery: Cost = kWh Needed × Rate ($/kWh). Charging time depends on charger power (Level 1 ~1.4 kW, Level 2 ~7–11 kW, DC fast 50–350 kW) and how much energy you add. Home off-peak rates often cut cost 30–50% vs peak.

Use this page when budgeting EV running costs, comparing home vs public charging prices, or quantifying annual savings vs a gas car at your local fuel and electricity rates. Enter battery size, state of charge, charger type, and $/kWh.

If the question is how far you can drive on a charge — after temperature, speed, climate control, and highway vs city mix — use the EV Range Calculator. Range planning and charging cost are related but answer different trip-planning questions.

How the EV Charging Cost Calculator Works

Formula, assumptions, and calculation steps for this solar & energy tool.

Formula Used

Cost = (Battery Capacity kWh / Charger Efficiency) x Electricity Rate per kWh

Methodology

Divides battery capacity by charging efficiency to find true energy drawn from the grid, then multiplies by the electricity rate.

Calculation Steps

Enter wattage, usage time, tariff, battery, or panel assumptions.
Convert power and time into energy units such as kWh.
Apply cost, savings, or sizing formulas.
Show monthly, annual, or per-charge estimates.

Assumptions and Limits

Weather, shading, tariffs, and equipment losses affect real results.
Utility net-metering rules vary by location.
Use installer or utility data for final sizing.

Frequently Asked Questions

What is the difference between Level 1, Level 2, and DC Fast Charging?

Level 1 (1.4 kW) uses a standard 120V household outlet and adds 3–5 miles per hour. Level 2 (7.2 kW typical) uses a 240V outlet or dedicated EVSE and adds 20–30 miles per hour. DC Fast Charging (50–350 kW) uses direct current and can charge to 80% in 20–40 minutes. Most home charging is Level 2; DC fast chargers are at public stations.

How much does it cost to fully charge an EV at home?

For a 75 kWh battery from 20% to 80% (60% charge = 45 kWh) at $0.13/kWh: 45 × $0.13 = $5.85. A full charge (0–100%) would cost about $9.75. Compare this to filling a 12-gallon gas tank at $3.50 = $42. The equivalent range for that gas would cost roughly 4× more.

Does charging to 100% damage an EV battery?

Regularly charging to 100% can accelerate battery degradation for some lithium-ion chemistries. Most manufacturers recommend keeping the daily charge level between 20–80% for longevity, with 100% charges reserved for long trips. Some EVs (Tesla LFP batteries) are designed to charge to 100% regularly without issue.

How does EV fuel cost compare to gasoline?

At average US rates ($0.13/kWh for electricity, $3.50/gallon for gas), an EV costs about 3–4 cents per mile vs 10–12 cents per mile for a 30 MPG gas car. Over 15,000 miles per year, that is roughly $450–600 in electricity vs $1,500–1,800 in gas — annual savings of $900–1,200 on fuel alone.

Real-World Applications

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Home Charging Cost

Calculate the monthly electricity cost of charging an EV overnight on a Level 2 EVSE at your local utility rate.

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EV vs Gas Comparison

Compare annual fuel cost for an EV vs an equivalent gasoline vehicle at current electricity and petrol prices.

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Road Trip Cost Planning

Estimate total charging cost for a long-distance journey using DC fast chargers at commercial rates along the route.

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TOU Rate Optimisation

Model the savings from shifting EV charging to off-peak hours under a time-of-use electricity tariff.

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Fleet Electrification Analysis

Calculate annual fuel savings of converting a commercial or delivery fleet from diesel to electric vehicles.

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Solar PV Self-Consumption

Estimate how much of EV charging can be covered by rooftop solar production during peak generation hours.

Common Mistakes

Using rated efficiency instead of real-world efficiency

EPA-rated efficiency (e.g. 4 mi/kWh) is measured under controlled conditions — real-world efficiency at highway speeds or in cold weather is typically 15–30% lower.

Ignoring charging losses

Home AC charging is 85–90% efficient — roughly 10–15% of electricity drawn from the wall is lost as heat in the charger and battery before it reaches the battery.

Comparing gas cost to public DC fast charging

DC fast charging at $0.35–$0.50/kWh can approach or exceed gasoline fuel costs at some electricity-equivalent prices. The EV advantage is clearest with home charging.

Not accounting for battery degradation

Li-ion batteries lose roughly 2–3% capacity per year — after 5 years, a 300-mile car may have only ~270 miles of range, affecting energy cost per mile calculations.

Forgetting destination charging costs

Some hotels and workplaces offer free charging; others charge a premium. A full charging cost model should account for where charging actually occurs.

EV Charger Level Comparison

Level	Power	Miles / Hour	Typical Use
Level 1 (120V)	1.4 kW	3–5 mi/hr	Emergency / overnight top-up
Level 2 (240V)	7.2–22 kW	20–35 mi/hr	Home & workplace charging
Level 2 (22 kW)	22 kW	~35 mi/hr	Commercial destination chargers
DC Fast (50 kW)	50 kW	~120 mi/hr	Public fast charging
DC Fast (150 kW)	150 kW	~350 mi/hr	Highway fast charging
Ultra-Fast (350 kW)	350 kW	~900 mi/hr	Compatible vehicles only (Ioniq 5/6, Porsche Taycan)

References

U.S. Department of Energy. Alternative Fuels Data Center — EV Charging. DOE, 2024.
U.S. Energy Information Administration. Electric Vehicle Charging Infrastructure. EIA, 2024.
SAE International. SAE J1772 — Electric Vehicle Conductive Charge Coupler. SAE, 2023.
Tesla Inc. Supercharger Network Pricing. Tesla, 2024.
Lutsey, Nic. Electric Vehicle Charging Infrastructure. International Council on Clean Transportation, 2023.