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EV Supercharging Cost Calculator

EV Supercharging Cost Calculator

Estimate the cost of an EV Supercharging or other DC fast-charging session from battery capacity, starting and ending charge, charging loss, station billing method, rate, session fees, and congestion or idle fees.

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Enter fast-charging session details

Example values are prefilled

Battery and charge session

Battery capacity is the usable or displayed capacity you want to model. The state-of-charge difference determines energy added to the battery.

Battery capacity

kWh

Use the usable battery capacity when available.

Starting charge

Battery state of charge when the session begins.

Ending charge

Target battery state of charge.

Charging loss allowance

Accounts for energy used by battery conditioning, conversion, and station-to-battery losses.

Vehicle efficiency

kWh/100 mi

Use your recent vehicle average for a better miles-added estimate.

Average charging power

Average power over the full session, not the advertised peak.

Station pricing

Rates vary by station, time, vehicle, membership, and network. Replace every example with the amount displayed before you plug in.

Billing method

Choose the method shown by the station.

Station price per kWh

$per kWh

Used when billing is based on energy.

Station price per minute

$per min

Used when billing is based on time.

Session or connection fee

Enter zero when the station has no fixed fee.

Congestion or idle-fee minutes

min

Only include minutes that are expected to incur a fee.

Congestion or idle fee

$per min

Use the fee displayed by the network; enter zero when none applies.

Fast-charging sessions per month

sessions

Used to estimate monthly and annual spending.

All default prices are editable examples. Cost scenarios vary the entered plan; they do not represent bids or guarantees.

How to use this ev supercharging calculator

Estimate an EV Supercharging or DC fast-charging session cost, energy delivered, charge time, miles added, monthly spending, and congestion or idle fees.

Formula

Battery energy added = battery capacity × (ending charge % − starting charge %). Billed energy = battery energy added ÷ (1 − charging loss %). Per-kWh cost uses billed energy × station rate; per-minute cost uses estimated session minutes × minute rate. Fixed and congestion fees are then added.

Worked example

Example: A 75 kWh battery charged from 20% to 80% adds 45 kWh to the battery. With an 8% loss allowance, the station supplies about 48.9 kWh. At $0.42 per kWh and no added fees, the estimated session cost is about $20.54.

Accuracy and limitations

This is a planning estimate, not a live station quote. Charging curves, battery temperature, station power sharing, taxes, memberships, dynamic rates, congestion thresholds, and idle-fee rules can change the actual cost. Supercharger is a Tesla trademark; this independent calculator is not affiliated with or endorsed by Tesla.

Frequently asked questions

Does this show the current price at a Tesla Supercharger?

No. Station prices can vary by location and time. Enter the rate shown in the vehicle or charging app immediately before the session.

Why is billed energy higher than energy added to the battery?

Some energy is used by charging electronics, cable and battery conditioning, and heat management. The editable loss allowance accounts for that difference.

Why can a per-minute estimate be inaccurate?

Charging power is not constant. It normally tapers as the battery fills, so the actual session duration depends on the vehicle, starting charge, temperature, and station conditions.

What are congestion or idle fees?

Some networks charge an additional per-minute fee after a threshold or after charging is complete. Enter only the minutes and rate that apply to the station you plan to use.