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EV Charging Cost Calculator

Estimate the cost to charge an EV from battery size, charge percent, charger loss, and source-dated rate and efficiency presets.

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Inputs

kWh
%
%

Your values stay on this device.

Results

Charging Session Cost
Energy from Wall58.33
Battery Energy Added52.5
Cost per Mile$0.05
Estimated Miles Added199.5

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Assumptions

  • Preset electricity prices and EV efficiencies are checked-in planning snapshots and can become stale.
  • Custom electricity price and vehicle efficiency remain editable because utility and charger rates vary.
  • Charging loss is modeled as a simple percentage.

Sensitivity preview

Battery Capacity -10%: Charging Session Cost $9.61

Battery Capacity Current: Charging Session Cost $9.61

Battery Capacity +10%: Charging Session Cost $9.61

Formula: Battery kWh added = battery kWh * (end percent - start percent). Wall kWh = battery kWh added / (1 - charging loss). Cost = wall kWh * price per kWh.

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About this EV Charging Cost Calculator

EV charging cost depends on how much battery energy you add, your electricity rate, vehicle efficiency, and charging losses. This calculator estimates session cost and cost per mile from checked-in presets or custom values.

Who this calculator is for

  • EV owners estimating home or public charging cost.
  • Car shoppers comparing electricity cost with gasoline.
  • Drivers planning commute or road-trip charging budgets.

When to use it

  • Estimate cost to charge from one battery percentage to another.
  • Compare utility rates, time-of-use rates, or public charger rates.
  • Estimate cost per mile from expected driving efficiency.

How to use this calculator

  1. Enter battery capacity and starting/ending state of charge.
  2. Choose an electricity rate preset or enter your own price per kWh.
  3. Choose an EV efficiency preset or enter miles per kWh manually.
  4. Adjust charging loss if needed.
  5. Review session cost, energy from the wall, and cost per mile.

Key assumptions

  • Preset electricity prices and EV efficiencies are checked-in planning snapshots and can become stale.
  • Custom electricity price and vehicle efficiency remain editable because utility and charger rates vary.
  • Charging loss is modeled as a simple percentage.
  • Calculations run locally and are for planning only.

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.

EV model battery and efficiency planning presets
Effective date
2026-05-06
Last reviewed
2026-05-06

Battery capacity, usable capacity, rated range, and real efficiency vary by trim, model year, temperature, software, tires, speed, and battery condition.

Public vehicle-efficiency references and manufacturer specifications summarized as rounded planning presets.

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 added = Battery capacity x (End percent - Start percent). Wall kWh = Battery kWh added / (1 - charging loss). Cost = Wall kWh x electricity price.
Battery kWh added = battery kWh * (end percent - start percent). Wall kWh = battery kWh added / (1 - charging loss). Cost = wall kWh * price per kWh.

Inputs explained

Battery capacity

Usable or nominal EV battery size in kWh.

State of charge

Starting and ending battery percentages for the session.

Electricity rate preset

A source-dated residential average rate preset. Choose custom for your utility, tariff, or charger price.

EV efficiency preset

A rounded planning efficiency preset. Choose custom for your vehicle trip data.

Charging loss

Energy lost as heat or charger overhead between the wall and battery.

Understanding your results

The session cost is an estimate before taxes, idle fees, demand fees, membership discounts, or utility minimums.

Example scenarios

Home charging session

Adding 52.5 kWh to a 75 kWh battery at $0.16/kWh with 10% loss costs about $9.33.

Key Features

  • Instant Calculation
  • Private & Secure
  • Mobile Optimized

Tips & Best Practices

  • Use your off-peak utility rate for home charging.
  • Use public charger posted rates for road-trip estimates.
  • Use actual trip efficiency from your car when available.

Frequently Asked Questions

Why is wall energy higher than battery energy?
Chargers and batteries are not perfectly efficient. Some energy is lost as heat and overhead, so wall kWh is higher than battery kWh added.
Does this include public charging idle fees?
No. Add idle fees, session fees, taxes, or membership discounts separately if they apply.
Are charging details stored?
No. The calculator runs locally in your browser.