ChargeEstimateKit

Sources & Methodology

ChargeEstimateKit uses straightforward calculator formulas with values entered by the user. The calculators are meant for educational and planning estimates, not guaranteed billing, safety, installation, or vehicle-specific results.

Pricing data is entered by the user. The current version does not use a live station price feed and does not include a country, city, or charging-network price database. For cost estimates, use the current price shown by your utility bill, charging app, station screen, or electricity plan.

The reference links below support general charging terminology, charging levels, home and public charging context, and the reality that electricity prices vary by location, provider, fuel costs, infrastructure, demand, taxes, and other local factors. They are background references for user understanding, not live data feeds used by the calculators.

Data policy

ChargeEstimateKit does not use a live price feed, utility tariff database, vehicle specification database, or charging network database. Users should enter the rate shown by a utility bill, charging app, station screen, vehicle dashboard, or electricity plan.

Source scope

Reference links are used for general charging terminology and background. Some references are U.S.-focused, including DOE AFDC and EIA pages. The calculators can still be used internationally because users enter their own rates, units, and efficiency values.

Review schedule

Last reviewed: 2026-06-14. The target review cadence is quarterly or when major reference pages change.

What these calculators do not do

  • They do not provide billing guarantees.
  • They do not check live station prices.
  • They do not select breaker size.
  • They do not approve wiring, permits, installation, load calculations, or code compliance.
  • They do not verify vehicle-specific charging limits.

Core formulas

  • EV Charging Time: energy needed (kWh) = battery capacity (kWh) x (target % - current %) / 100
  • EV Charging Time: charging hours = energy needed (kWh) / (charger power (kW) x efficiency)
  • EV Charging Cost: wall energy (kWh) = energy added (kWh) / efficiency
  • EV Charging Cost: cost = wall energy (kWh) x electricity price per kWh + session fee
  • Home vs Public Cost: cost = energy added / efficiency x price per kWh + fixed fees
  • kWh to Range: range = available energy x vehicle efficiency
  • Charger Power: single-phase kW = volts x amps x power factor / 1000
  • Charger Power: three-phase kW = volts x amps x sqrt(3) x power factor / 1000
  • Battery Charging Time: Wh = volts x Ah
  • Battery Charging Time: Wh = volts x mAh / 1000
  • Battery Charging Time: charging hours = battery Wh / (charger W x efficiency)

Reference links