EV Cheap Charger Trip ROI Calculator
Driving out of your way to a cheaper charger can save money on electricity — but only if the energy used getting there costs less than the savings from the lower rate. This calculator finds the true net savings and the maximum round-trip distance where the trip still makes financial sense.
How Break-Even Distance Is Calculated
Savings per charge = charge amount × (home rate − cheap rate). Travel cost = round-trip miles ÷ efficiency × cheap rate. Break-even distance is where those two are equal. If the charger is within that distance, the trip saves money; if it's farther, it costs more than you save.
When Does a Cheap Charger Trip Pay Off?
The bigger the rate difference and the higher your charge amount, the more valuable the trip. A $0.07/kWh rate difference on a 50 kWh charge saves $3.50. If the round-trip energy cost is under $3.50, the trip is worthwhile — regardless of charger brand or speed.
Frequently Asked Questions
When the cheap charger rate equals or exceeds your home rate, or when the round-trip distance is beyond the break-even point.
No — only the rate per kWh matters for cost. Faster chargers save time but charge the same total energy at the same rate.
This calculator covers electricity cost only. For a complete analysis, factor in your time value — 30 minutes of driving time is real cost even if the electricity is "free."