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Free EV Charging Cost Calculator

Calculate the cost of charging your electric vehicle and compare it with gasoline costs. See how much you can save per month, per year, and over 5 years by driving electric.

EV Charging Cost & Savings Estimator

$0.00
Cost for This Charging Session
Energy Needed0 kWh
Charging Time0 hrs
Monthly EV Cost$0
Monthly Gas Equivalent$0
Monthly Savings$0
Annual Savings$0
5-Year Projected Savings$0

How to Use the EV Charging Calculator

Start by entering your EV's battery capacity in kWh (typically 40-100 kWh for most electric cars) and your miles per kWh efficiency (most EVs average 3-4 miles per kWh). Enter your current charge percentage and target charge percentage to calculate how much energy you need to add.

Enter your electricity rate in $/kWh (the US average is about $0.14/kWh) and select your charging speed. For the gas comparison, enter your gas car's MPG, your local gas price, and your monthly miles driven.

Click "Calculate" to see the cost for a single charging session, plus your monthly and annual savings compared to gasoline. The 5-year projection shows the long-term financial benefit of owning an EV.

EV Charging Cost Formula

The calculation follows these formulas:

Energy Needed = Capacity × (Target − Current) / 100
Charging Time = Energy Needed / Charger Speed
Session Cost = Energy Needed × Electricity Rate
Monthly EV Cost = (Monthly Miles / Efficiency) × Rate
Monthly Gas Cost = (Monthly Miles / MPG) × Gas Price
Monthly Savings = Gas Cost − EV Cost

Charging speeds: Level 1 = 1.4 kW (standard household outlet), Level 2 = 7.2 kW (home wall charger), Level 3 DC Fast = 50 kW (public fast charger). Actual charging speeds may vary based on your vehicle's maximum acceptance rate and battery temperature.

Frequently Asked Questions

Yes, in almost all cases. The average cost to drive an EV is about 4-5 cents per mile, compared to 10-12 cents per mile for a gasoline car. Even with recent electricity rate increases, EV charging remains significantly cheaper than gasoline. The savings are largest if you charge at home, especially during off-peak hours when electricity rates are lowest.
Charging time depends on the battery size, charger power, and current charge level. Level 1 adds about 3-5 miles of range per hour. Level 2 adds 20-30 miles per hour and can fully charge most EVs overnight. Level 3 DC fast chargers can add 150-200 miles of range in about 30 minutes.
Most modern EVs achieve between 3.0 and 4.5 miles per kWh in mixed driving. Smaller EVs like the Tesla Model 3 can achieve 4.0-4.5 miles/kWh, while larger EVs like SUVs and trucks typically get 2.5-3.5 miles/kWh.
The average driver saves $800-$1,500 per year on fuel costs by switching from a gas car to an EV. At current average rates, driving 12,000 miles per year in an EV costs about $480 in electricity versus $1,400 in gas for a 30 MPG car.