Tesla Charging Calculator

WORKED EXAMPLE

Example: an AC charging session

For an illustrative 75 kWh usable battery, going from 20% to 80% adds 45 kWh. At 90% energy efficiency, that requires 50 metered kWh. With 7.2 kW effective AC input and an example rate of $0.16/kWh, the estimate is about 6 hours 57 minutes and $8.00, with no session fee. These are custom assumptions, not specifications for a Tesla model.

WORKED EXAMPLE

Example: a one-hour stop

Using those same AC assumptions for one hour adds 6.48 kWh, reaching 28.64% charge. Metered energy is 7.2 kWh, costing $1.15 after rounding. A separate DC scenario averaging 90 kW into the battery would add the full 45 kWh in 30 minutes; its energy-billing assumption affects cost, not that battery-side time calculation.

Enter your vehicle’s usable capacity and AC limit

This is a custom estimator with no claimed official battery-capacity presets. Tesla explains that onboard AC capability varies by vehicle; check the vehicle display or documentation. Effective AC power is the lowest known limit among the configured charging equipment, vehicle, and supply. A station’s advertised maximum alone cannot establish delivered power.

Average DC power is not a peak rating

DC charging bypasses the onboard AC conversion stage. Use an average battery-side power for the intended charge interval, not a Supercharger’s peak rating. Tesla notes that charging rate changes with charge level, temperature, battery, and vehicle configuration. A constant-average estimate does not simulate those changes.

Metering, losses, and fees

The energy-efficiency input represents battery energy gained divided by the energy billed at your chosen meter boundary. AC timing uses input power; DC timing already uses battery-side power, so losses are not applied to that time again. Enter the applicable rate yourself. This estimate covers energy and the entered session fee, not variable parking, congestion, or per-minute charges.

A shorter stop has a smaller energy bill

The stop estimate ends when your time runs out or the target charge is reached, whichever comes first. It charges for the predicted energy actually delivered during that stop and applies a session fee once if charging occurs. If the target is already reached, no charging or session fee is needed.