EV Charging Cost Calculator

Frequently Asked Questions

How does EV charging cost compare to gasoline?

At $0.16/kWh, charging a 75 kWh EV from empty costs about $12. A comparable gas car at 30 MPG with a 12-gallon tank at $3.50/gallon costs $42 - roughly a 3x cost advantage for home electricity.

Why is charger efficiency less than 100%?

AC-to-DC conversion, battery management electronics, and thermal management all consume energy. Modern Level 2 chargers achieve about 90% efficiency in moderate temperatures; cold weather can reduce this.

What is the best charge level to stop at daily?

Most manufacturers recommend keeping the battery between 20% and 80% for daily use. Reserve 100% charges for long trips and use them the same day to minimize time at full charge.

Can I use a regular 120V outlet?

Yes, Level 1 charging works on any standard outlet. It is slow but fine for vehicles with small batteries or short daily drives. A 40-mile commute can be recovered overnight on Level 1.

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Estimates for informational purposes only.

Important Disclaimer: Estimates for informational purposes only.

This calculator provides estimates for informational purposes only. Results are based on assumptions and may not reflect actual outcomes. Consult qualified professionals in relevant fields before making important decisions based on these results.

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How It Works

The calculation has three parts: Energy added (kWh) = battery capacity × (target% − current%) ÷ 100. Energy drawn from the grid (kWh) = energy added ÷ charger efficiency (chargers and the car's battery management system waste some energy as heat). Cost ($) = energy drawn × electricity rate.

Charging time is estimated by dividing the energy needed by the charger's power output in kilowatts. DC fast chargers typically taper speed as the battery approaches 80% to protect battery longevity, so actual high-SOC charging takes longer than this linear estimate.

Level 1, Level 2, and DC Fast Charging

Level 1 (120V AC, ~1.4 kW): Standard household outlet. Adds roughly 3-5 miles of range per hour. Practical only for plug-in hybrids or drivers who rarely exceed 30-40 miles per day. A full charge for an 82 kWh battery takes about 60 hours.

Level 2 (240V AC, 3.3-19.2 kW): Requires a dedicated 240V circuit. Home Level 2 chargers typically deliver 7.2 kW, adding 20-30 miles per hour. A full charge for a 75 kWh battery takes about 8-10 hours - ideal for overnight charging.

DC Fast Charging (50-350 kW): Bypasses the car's onboard charger and pushes high-voltage DC directly to the battery. Most EVs can charge from 10% to 80% in 20-45 minutes. Charging above 80% slows dramatically by design to protect the battery pack.

Tips for Cheap Off-Peak Charging

Time-of-use (TOU) rates can drop to $0.05-0.08/kWh overnight - 50-70% cheaper than peak rates.

Schedule charging in your car's app to plug in immediately but delay actual charging until off-peak hours begin.

Keep your battery in the 20-80% range regularly to maximize longevity and ensure DC fast charging stays at maximum speed when you need public chargers.

If you have home solar, charging midday during peak production can make your effective fuel cost nearly zero.

Compare home charging cost to public DC fast charging rates - commercial fast charging at $0.35-0.60/kWh can approach or exceed gas costs per mile.

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