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EV Home Charging Cost Calculator

EV Home Charging Cost Calculator

Estimate home EV charging energy and cost from annual miles, the share charged at home, vehicle efficiency, charging loss, electricity rate, charger power, and fixed utility fees. Add a gasoline comparison and installation cost to estimate savings and simple payback.

22-calculator project library Reviewed 2026-07-25Calculations run privately in your browser

Enter driving, utility, and installation details

Example values are prefilled

Driving and vehicle

Use a recent efficiency value from the vehicle rather than an advertised best case when possible.

Miles driven per year

Total annual EV driving.

Driving energy charged at home

Public and workplace charging are excluded from this calculator.

Vehicle efficiency

kWh/100 mi

Battery energy consumed to travel 100 miles.

Home charging loss allowance

Accounts for conversion and battery-conditioning losses.

Battery capacity

kWh

Used to estimate a 0% to 100% refill cost.

Home electricity and equipment

For time-of-use plans, enter the rate that applies during the hours when the vehicle normally charges.

Electricity rate

$per kWh

Include applicable energy charges and taxes when practical.

Average charging power

A Level 2 unit may deliver less than its nameplate rating because of vehicle or circuit limits.

EV plan or charger fixed fee

$per month

Enter only an added fee caused by EV charging, not the normal household customer charge.

Charger and installation cost

Include equipment, electrical work, permits, and panel upgrades that apply.

Gasoline comparison

The comparison uses the same miles assigned to home charging. It excludes maintenance, insurance, depreciation, and public EV charging.

Gasoline price

$per gal

Use a local price you expect to pay.

Comparison vehicle fuel economy

mpg

Use a comparable gasoline vehicle and realistic combined fuel economy.

All default prices are editable examples. Cost scenarios vary the entered plan; they do not represent bids or guarantees.

How to use this ev home charging calculator

Estimate monthly and annual EV home-charging cost, electricity use, charging time, cost per 100 miles, gasoline savings, and charger installation payback.

Formula

Home-charged miles = annual miles × home charging %. Battery energy = home-charged miles × vehicle kWh per 100 miles ÷ 100. Meter energy = battery energy ÷ (1 − charging loss %). Annual charging cost = meter energy × electricity rate + monthly EV-specific fees × 12.

Worked example

Example: Driving 12,000 miles per year with 90% of the energy charged at home and efficiency of 28 kWh per 100 miles uses 3,024 kWh in the battery. With 10% charging loss, the meter supplies about 3,360 kWh. At $0.18 per kWh, that is about $605 per year before any fixed fee.

Accuracy and limitations

Actual cost depends on weather, speed, terrain, cabin conditioning, battery temperature, charging efficiency, utility rate design, demand charges, taxes, and public charging. Installation work may require permits, load calculations, service upgrades, and a qualified electrician. Savings and payback are simple comparisons, not guarantees.

Frequently asked questions

How do I find my EV's kWh per 100 miles?

Use the recent trip or energy screen in the vehicle or app. A real seasonal average is usually more useful than a brochure figure.

Should I use my utility's average bill rate?

Use the marginal rate that applies when the vehicle charges. On a time-of-use plan, that may be an off-peak, mid-peak, or blended charging rate.

Does the payback include EV tax credits or rebates?

No. Enter the net installation cost only after independently verifying any incentive and eligibility requirements.

Why compare only home-charged miles?

The calculator does not know the price of your workplace or public charging. Restricting the comparison prevents those unmodeled costs from being treated as free.