Calculator
Charging cost calculator
Find out what a single charging session costs, from your battery size, state electricity rate, and how much charge you're adding.
How this is calculated
Energy added equals battery capacity multiplied by the percentage-point gap between your starting and target charge. Cost equals that energy multiplied by the state's electricity rate, with a 2.2x premium applied for DC fast charging to reflect typical public network pricing.
Frequently asked questions
Why does the cost depend on start and target charge?
A charge from 20% to 80% moves 60% of the battery’s capacity, not the full pack. Cost scales with the kWh actually delivered.
Why is DC fast charging more expensive per kWh?
Public fast-charging networks price above residential electricity rates to cover equipment, real estate, and demand charges. We model this as a 2.2x multiplier on the state’s home rate.