Calculator collection
EV charging calculators
What it costs to charge an electric car or a Tesla at home or at a fast charger.
New to the topic? Read How Much Does It Cost to Charge an Electric Car?.
FAQ
Frequently asked questions
How do I calculate the cost to charge an electric car?
Multiply the battery kWh you add by your price per kWh, then divide by charging efficiency (about 0.9 for Level 2). Adding 45 kWh at 18.2¢ per kWh and 90% efficiency costs about $9.10.
Is it cheaper to charge an EV at home?
Usually yes. Home electricity averages about 18¢ per kWh in the US, while public DC fast chargers commonly charge 40 to 60¢ per kWh or more. Time-of-use rates can make overnight home charging cheaper still.
What is charging efficiency?
Some energy is lost as heat in the charger, cables and battery, so you buy more kWh from the wall than reach the battery. Level 2 home charging is typically 85–95% efficient; Level 1 is often lower.
How much does an EV cost per mile?
Divide your price per kWh by the car’s miles per kWh and by charging efficiency. At 18.2¢ per kWh, 3.5 miles per kWh and 90% efficiency, that is about 5.8¢ per mile.
Can I charge my EV from solar panels?
Yes. Solar panels can charge an EV directly during the day or offset the charging through net metering. Each kWh a home array produces can add roughly 3 to 4 miles of range to a typical EV.
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