How the calculation works
Battery energy = miles × kWh/100 miles ÷ 100. Metered energy = battery energy ÷ (charging efficiency/100). Energy cost = metered kWh × cents/kWh ÷ 100. This excludes demand, public charging fees, parking, hardware and installation.
Use inputs you can defend
Read the units and use a consistent billing period. Defaults are examples; replace them with values relevant to your decision. If a cost is unknown, the result cannot establish that it is zero. Keep excluded charges in a separate budget and compare the same service scope before judging two alternatives. You can print this page for your own records without creating a website inquiry.
Calculate metered electricity, not just battery energy
Multiply monthly miles by the vehicle’s kWh per 100 miles and divide by 100. Divide that result by charging efficiency as a decimal to estimate metered energy. Multiply by the applicable price per kWh. Public charging can add session, idle, parking or other charges, so a home-rate calculation should not be presented as an all-network charging budget.
Check the business demand effect
A charger adds power while it operates. Several chargers running together can coincide with the site’s existing peak. Managed charging may change when that load occurs, subject to vehicle readiness and operational constraints. Use interval data and the tariff to evaluate billed demand. The energy calculation alone does not capture demand charges, service upgrades, network fees or maintenance.
Verify current program and tax timing
Use the exact utility program and current IRS guidance before assigning an incentive to a charger project. The IRS currently states Section 30C qualifying property must be placed in service before July 1, 2026 and meet applicable requirements, including location rules. Do not assume an old credit applies to a new installation. Distinguish a tax benefit from a utility rebate and confirm eligibility with appropriate professional help.
Keep the inputs private
These calculations run on this page using your browser. They do not save values to local storage, attach figures to a review request or send them to a server. If you choose to ask a question, the review link may select only the inquiry type. Closing or refreshing the page discards your edits. The print button opens your browser’s print dialog.
Sources & further checks
Primary references checked for this guide on October 15, 2026. Follow the source for current tariffs, eligibility and program terms; rates here are not live offers.