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California EV Charging Cost Calculator

Estimate monthly California EV charging cost from miles, efficiency, rate, loss, and sessions.

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Inputs

mi

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Estimated Monthly Charging Cost

Estimated monthly EV charging cost from entered rates and fees.

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Assumptions

  • Electricity rate is user-entered because California tariffs vary widely.
  • Charging loss is modeled as a simple percentage.
  • Session fees are multiplied by sessions per month and added to energy cost.

Sensitivity preview

Monthly Miles -10%: Estimated Monthly Charging Cost $76.90

Monthly Miles Current: Estimated Monthly Charging Cost $85.45

Monthly Miles +10%: Estimated Monthly Charging Cost $93.99

Formula: If efficiency is mi/kWh, battery kWh = miles / mi per kWh. If efficiency is kWh/100 mi, battery kWh = miles x kWh per 100 mi / 100. Wall kWh = battery kWh / (1 - charging loss). Monthly cost = wall kWh x rate + sessions x session fee.

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About this California EV Charging Cost Calculator

California EV charging costs can vary by home utility plan, time-of-use period, public charger network, session fees, and charging losses. This calculator uses editable inputs so you can model the tariff or charger rate that applies to you.

Who this calculator is for

  • California EV drivers estimating home or public charging budgets.
  • Drivers comparing gas and EV monthly costs.
  • Car shoppers modeling ownership cost with local utility rates.

When to use it

  • Estimate monthly charging spend from miles and electricity rate.
  • Compare off-peak home charging with public charging rates.
  • Add per-session fees for networks that charge session costs.

How to use this calculator

  1. Enter monthly miles driven.
  2. Choose whether your efficiency value is in miles per kWh or kWh per 100 miles.
  3. Enter the electricity or public charging rate you want to model.
  4. Adjust charging loss and session fees if your charger or utility bill includes them.

Key assumptions

  • Electricity rate is user-entered because California tariffs vary widely.
  • Charging loss is modeled as a simple percentage.
  • Session fees are multiplied by sessions per month and added to energy cost.

Dataset sources

EIA retail electricity price data
Effective date
2024
Last reviewed
2026-05-05

State and national average retail rates are planning references, not a utility tariff or time-of-use schedule.

Public U.S. Energy Information Administration data.

EV efficiency planning presets
Effective date
2026-05-05
Last reviewed
2026-05-05

Actual EV efficiency varies with speed, temperature, tires, terrain, battery age, and driving behavior.

Curated planning presets derived from public vehicle-efficiency references and rounded for calculator use.

Accuracy and testing

Review formula sources, default test cases, assumptions, unit handling, rounding rules, and changelog for this calculator.

View accuracy page

How this calculator works

Battery kWh needed is calculated from miles and the selected efficiency unit. Wall kWh = battery kWh / (1 - charging loss). Monthly cost = wall kWh x electricity rate + sessions per month x session fee.
If efficiency is mi/kWh, battery kWh = miles / mi per kWh. If efficiency is kWh/100 mi, battery kWh = miles x kWh per 100 mi / 100. Wall kWh = battery kWh / (1 - charging loss). Monthly cost = wall kWh x rate + sessions x session fee.

Inputs explained

Monthly miles

The EV miles you expect to drive in the month.

Efficiency mode

Choose mi/kWh if your car reports miles per kWh, or kWh/100 mi if it reports energy per 100 miles.

Charging loss

Estimated energy lost between the wall or charger and the battery.

Sessions per month

Number of charging sessions used to model per-session fees.

Understanding your results

The monthly cost is an estimate based on your entered rate and fees. Verify utility tariffs, charger pricing, rebates, and exceptions for actual billing.

Example scenarios

Home charging month

Driving 900 miles at 3.4 mi/kWh, $0.32/kWh, 10% loss, and no session fees estimates about $94.12.

Key Features

  • Supports mi/kWh or kWh/100 mi efficiency inputs.
  • Includes editable charging-loss and session-fee assumptions.
  • Uses user-entered tariffs instead of live utility rates.

Things to Keep in Mind

This calculator is a planning estimate only. It is not utility, tax, DMV, or transportation advice and does not verify official tariffs, time-of-use windows, demand charges, rebates, idle fees, or exceptions.

Tips & Best Practices

  • Use your utility plan rate for the charging window you actually use.
  • Use public charger posted rates for road-trip or apartment-charging scenarios.
  • Check whether taxes, idle fees, demand charges, or rebates apply outside this estimate.

Glossary of Terms

mi/kWh
Miles driven per kilowatt-hour. Higher is more efficient.
kWh/100 mi
Kilowatt-hours used per 100 miles. Lower is more efficient.

Frequently Asked Questions

Does this include California utility time-of-use rates?
Only if you enter the applicable rate. Verify official utility tariffs, charging windows, rebates, and exceptions.
Why include charging loss?
Charging is not perfectly efficient. The loss field estimates extra wall energy needed beyond battery energy.
Is this utility or tax advice?
No. This is a planning estimate only, not DMV, tax, utility, or transportation advice.