Public Charging Station Cost Comparison Calculator

ANA›Life Services Authority›National Calculator Authority›Public Charging Station Cost Comparison Calculator

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Public Charging Station Cost Comparison Calculator

Compare the total cost of charging your electric vehicle at Level 2 public stations, DC Fast Chargers (DCFC), and home charging to find the most economical option.

### Vehicle & Charging Needs

Battery Capacity (kWh)

Total usable battery capacity of your EV

Charge From (% SoC)

State of charge before charging session

Charge To (% SoC)

Target state of charge after session

Public Charging Sessions per Month

How many times per month you use public chargers

### Level 2 Public Charging (AC)

Level 2 Rate ($/kWh)

Per-kWh rate at Level 2 stations (e.g. ChargePoint, Blink)

Level 2 Session Fee ($)

Flat fee charged per session (if any)

Level 2 Idle/Parking Fee ($/hr)

Hourly fee charged after charging completes

Level 2 Charger Power (kW)

Typical Level 2 output power (6.6–19.2 kW)

Idle Hours After Charging (hrs)

Hours vehicle sits plugged in after full charge

### DC Fast Charging (DCFC)

DCFC Rate ($/kWh or $/min)

Per-kWh rate (Tesla Supercharger ~$0.25–$0.50, Electrify America ~$0.43–$0.48)

DCFC Billing Method

Per kWh Per Minute

How the DCFC network bills you

DCFC Session Fee ($)

Flat fee per DCFC session (if any)

DCFC Average Power (kW)

Average charge rate during session (accounting for taper)

Network Membership Fee ($/month)

Monthly subscription fee for discounted rates (e.g. EA Pass+)

### Home Charging (Baseline)

Home Electricity Rate ($/kWh)

Your utility rate (US avg ~$0.16/kWh)

Charger Efficiency (%)

AC-to-DC conversion efficiency (typically 85–95%)

Calculate Costs

function pubCalc() { // --- Inputs --- var batterySize = parseFloat(document.getElementById('pub-battery-size').value); var chargeFrom = parseFloat(document.getElementById('pub-charge-from').value); var chargeTo = parseFloat(document.getElementById('pub-charge-to').value); var sessionsPerMonth= parseFloat(document.getElementById('pub-sessions-per-month').value);

var l2Rate = parseFloat(document.getElementById('pub-l2-rate').value); var l2SessionFee = parseFloat(document.getElementById('pub-l2-session-fee').value); var l2IdleFee = parseFloat(document.getElementById('pub-l2-idle-fee').value); var l2Power = parseFloat(document.getElementById('pub-l2-power').value); var l2IdleHours = parseFloat(document.getElementById('pub-l2-idle-hours').value);

var dcfcRate = parseFloat(document.getElementById('pub-dcfc-rate').value); var dcfcBilling = document.getElementById('pub-dcfc-billing').value; var dcfcSessionFee = parseFloat(document.getElementById('pub-dcfc-session-fee').value); var dcfcPower = parseFloat(document.getElementById('pub-dcfc-power').value); var membershipFee = parseFloat(document.getElementById('pub-membership-fee').value);

var homeRate = parseFloat(document.getElementById('pub-home-rate').value); var efficiency = parseFloat(document.getElementById('pub-charger-efficiency').value) / 100;

// --- Validation --- var errors = []; if (isNaN(batterySize) || batterySize = 100) errors.push("Charge From must be between 0 and 99%."); if (isNaN(chargeTo) || chargeTo 100) errors.push("Charge To must be between 1 and 100%."); if (chargeTo 1) errors.push("Charger efficiency must be between 1 and 100%.");

if (errors.length > 0) { document.getElementById('pub-result').innerHTML = 'Please fix the following:' + errors.map(function(e){ return ''; }).join('') + ''; return; }

// --- Core Calculations --- // Energy needed per session (kWh delivered to battery) var socDelta = (chargeTo - chargeFrom) / 100; var energyPerSession = batterySize * socDelta; // kWh (battery) // Energy drawn from grid (accounts for efficiency losses) var gridEnergyPerSession = energyPerSession / efficiency; // kWh (grid)

// --- Level 2 Cost per Session --- var l2ChargingTime = energyPerSession / l2Power; // hours var l2EnergyCost = gridEnergyPerSession * l2Rate; var l2IdleCost = l2IdleFee * l2IdleHours; var l2CostPerSession = l2EnergyCost + l2SessionFee + l2IdleCost; var l2MonthlyCost = l2CostPerSession * sessionsPerMonth; var l2AnnualCost = l2MonthlyCost * 12; var l2CostPer100km = (l2CostPerSession / energyPerSession) * 20; // assuming ~5 mi/kWh → 20 kWh/100km

// --- DCFC Cost per Session --- var dcfcChargingTime = energyPerSession / dcfcPower; // hours var dcfcChargingMins = dcfcChargingTime * 60; // minutes var dcfcEnergyCost; if (dcfcBilling === 'kwh') { dcfcEnergyCost = gridEnergyPerSession * dcfcRate; } else { // Per-minute billing dcfcEnergyCost = dcfcChargingMins * dcfcRate; } var dcfcCostPerSession = dcfcEnergyCost + dcfcSessionFee; var dcfcMonthlyCost = (dcfcCostPerSession * sessionsPerMonth) + membershipFee; var dcfcAnnualCost = dcfcMonthlyCost * 12; var dcfcEffectiveRate = dcfcCostPerSession / gridEnergyPerSession; // $/kWh effective

// --- Home Charging Cost per Session --- var homeCostPerSession = gridEnergyPerSession * homeRate; var homeMonthlyCost = homeCostPerSession * sessionsPerMonth; var homeAnnualCost = homeMonthlyCost * 12;

// --- Savings vs Home --- var l2VsHomeSavingsMonthly = homeMonthlyCost - l2MonthlyCost; var dcfcVsHomeSavingsMonthly = homeMonthlyCost - dcfcMonthlyCost; var l2VsHomeSavingsAnnual = homeAnnualCost - l2AnnualCost; var dcfcVsHomeSavingsAnnual = homeAnnualCost - dcfcAnnualCost;

// --- Effective $/kWh --- var l2EffectiveRate = l2CostPerSession / gridEnergyPerSession; var homeEffectiveRate = homeRate;

// --- Cost per mile (assuming 3.5 mi/kWh efficiency) --- var milesPerKwh = 3.5; var l2CostPerMile = l2EffectiveRate / milesPerKwh; var dcfcCostPerMile = dcfcEffectiveRate / milesPerKwh; var homeCostPerMile = homeEffectiveRate / milesPerKwh;

// --- Charging Time --- var l2TimeHrs = Math.floor(l2ChargingTime); var l2TimeMins = Math.round((l2ChargingTime - l2TimeHrs) * 60); var dcfcTimeMins = Math.round(dcfcChargingMins);

// --- Best Option --- var costs = [ { name: 'Home Charging', monthly: homeMonthlyCost }, { name: 'Level 2 Public', monthly: l2MonthlyCost }, { name: 'DC Fast Charging', monthly: dcfcMonthlyCost } ]; costs.sort(function(a,b){ return a.monthly - b.monthly; }); var bestOption = costs[0].name;

function fmt(n, d) { return '$' + n.toFixed(d !== undefined ? d : 2); } function fmtSaving(n) { if (n > 0) return 'Save ' + fmt(n) + '/mo'; if (n Extra ' + fmt(Math.abs(n)) + '/mo'; return 'Same cost'; }

document.getElementById('pub-result').innerHTML = '### ⚡ Charging Cost Comparison Results ' +

'' + '🔍 Session Details: ' + 'Charging ' + chargeFrom + '% → ' + chargeTo + '%  |  ' + 'Energy needed: ' + energyPerSession.toFixed(1) + ' kWh (battery) / ' + '' + gridEnergyPerSession.toFixed(1) + ' kWh (grid, ' + (efficiency*100).toFixed(0) + '% efficiency)' + '' +

'' + '' + 'Metric' + '🏠 Home' + '⚡ Level 2' + '💃 DCFC' + '' +

'Cost per Session' + '' + fmt(homeCostPerSession) + '' + '' + fmt(l2CostPerSession) + '' + '' + fmt(dcfcCostPerSession) + '' +

'Effective Rate ($/kWh)' + '' + fmt(homeEffectiveRate, 3) + '' + '' + fmt(l2EffectiveRate, 3) + '' + '' + fmt(dcfcEffectiveRate, 3) + '' +

'Cost per Mile (3.5 mi/kWh)' + '' + fmt(homeCostPerMile, 3) + '' + '' + fmt(l2CostPerMile, 3) + '' + '' + fmt(dcfcCostPerMile, 3) + '' +

'Monthly Cost (' + sessionsPerMonth + ' sessions)' + '' + fmt(homeMonthlyCost) + '' + '' + fmt(l2MonthlyCost) + '' + '' + fmt(dcfcMonthlyCost) + (membershipFee > 0 ? 'incl. ' + fmt(membershipFee) + '/mo membership' : '') + '' +

'Annual Cost' + '' + fmt(homeAnnualCost) + '' + '' + fmt(l2AnnualCost) + '' + '' + fmt(dcfcAnnualCost) + '' +

'vs. Home (Monthly)' + '—' + '' + fmtSaving(l2VsHomeSavingsMonthly) + '' + '' + fmtSaving(dcfcVsHomeSavingsMonthly) + '' +

'Charging Time' + '' + l2TimeHrs + 'h ' + l2TimeMins + 'm (L2 home)' + '' + l2TimeHrs + 'h ' + l2TimeMins + 'm' + '~' + dcfcTimeMins + ' min' +

'' +

'' + '🏆 Most Economical Option: ' + bestOption + '' + 'Annual savings vs. most expensive: ' + fmt(Math.abs(costs[2].monthly - costs[0].monthly) * 12) + '/year' + '' +

'' + '💡 Tip: DCFC is fastest (' + dcfcTimeMins + ' min) but costs ' + fmt(Math.abs(dcfcCostPerSession - homeCostPerSession)) + ' more per session than home charging. ' + 'Over a year (' + sessionsPerMonth + ' sessions/mo), that's ' + fmt(Math.abs(dcfcAnnualCost - homeAnnualCost)) + ' extra annually.' + ''; }

#### Formulas Used

Energy per Session (battery): Ebattery = Battery Capacity × (SoCto − SoCfrom) / 100

Grid Energy (accounting for losses): Egrid = Ebattery / η    where η = charger efficiency (decimal)

Level 2 Cost per Session: CL2 = (Egrid × RateL2) + Session Fee + (Idle Fee × Idle Hours)

DCFC Cost per Session (per-kWh billing): CDCFC = (Egrid × RateDCFC) + Session Fee

DCFC Cost per Session (per-minute billing): CDCFC = (Ebattery / PowerDCFC × 60 min) × Rate$/min + Session Fee

Charging Time (Level 2): TL2 = Ebattery / PowerL2   (hours)

Monthly Cost: Monthly = Costper session × Sessions/Month + Membership Fee

Effective $/kWh: Effective Rate = Total Session Cost / Egrid

Cost per Mile: Cost/Mile = Effective Rate / Vehicle Efficiency (mi/kWh)

#### Assumptions & References

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References

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