EV Charging Cost Calculator (Maryland Electricity Rates)

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EV Charging Cost Calculator (Maryland Electricity Rates)

Estimate how much it costs to charge your electric vehicle at home using Maryland's average residential electricity rates.

Battery Capacity (kWh)

Total usable battery capacity of your EV (e.g., Tesla Model 3 Long Range = 75 kWh)

Current State of Charge (%)

Your battery's current charge level before charging

Target State of Charge (%)

Your desired charge level after charging

Charger Efficiency (%)

Typical Level 2 charger efficiency is 85–90%; Level 1 is ~80%

Electricity Rate (¢/kWh)

Maryland average residential rate ≈ 14.37 ¢/kWh (EIA, 2024). Check your bill for your exact rate.

Charges Per Month

How many times per month you perform this charge session

Calculate

function evCalc() { var resultDiv = document.getElementById('ev-result');

var batteryCapacity = parseFloat(document.getElementById('ev-battery-capacity').value); var currentCharge = parseFloat(document.getElementById('ev-current-charge').value); var targetCharge = parseFloat(document.getElementById('ev-target-charge').value); var chargerEfficiency = parseFloat(document.getElementById('ev-charger-efficiency').value); var electricityRate = parseFloat(document.getElementById('ev-electricity-rate').value); var chargesPerMonth = parseFloat(document.getElementById('ev-charges-per-month').value);

// --- Validation --- var errors = [];

if (isNaN(batteryCapacity) || batteryCapacity 200) { errors.push("Battery capacity must be between 1 and 200 kWh."); } if (isNaN(currentCharge) || currentCharge 100) { errors.push("Current state of charge must be between 0% and 100%."); } if (isNaN(targetCharge) || targetCharge 100) { errors.push("Target state of charge must be between 0% and 100%."); } if (!isNaN(currentCharge) && !isNaN(targetCharge) && targetCharge 100) { errors.push("Charger efficiency must be between 50% and 100%."); } if (isNaN(electricityRate) || electricityRate 100) { errors.push("Electricity rate must be between 1 and 100 ¢/kWh."); } if (isNaN(chargesPerMonth) || chargesPerMonth 365) { errors.push("Charges per month must be between 1 and 365."); }

if (errors.length > 0) { resultDiv.style.display = 'block'; resultDiv.innerHTML = 'Please fix the following:' + errors.map(function(e){ return ''; }).join('') + ''; return; }

// --- Core Formulas --- // 1. Energy needed by the battery (kWh) var chargeDelta = (targetCharge - currentCharge) / 100; var energyToBattery = batteryCapacity * chargeDelta;

// 2. Energy drawn from the grid (kWh) — accounts for charger losses var efficiencyDecimal = chargerEfficiency / 100; var energyFromGrid = energyToBattery / efficiencyDecimal;

// 3. Cost per session ($) var ratePerKwh = electricityRate / 100; // convert cents to dollars var costPerSession = energyFromGrid * ratePerKwh;

// 4. Monthly cost ($) var monthlyCost = costPerSession * chargesPerMonth;

// 5. Annual cost ($) var annualCost = monthlyCost * 12;

// 6. Cost per mile (assumes EPA average EV efficiency ~3.5 miles/kWh) var epaEfficiency = 3.5; // miles per kWh (battery) var milesPerSession = energyToBattery * epaEfficiency; var costPerMile = (milesPerSession > 0) ? (costPerSession / milesPerSession) : 0;

// --- Output --- resultDiv.style.display = 'block'; resultDiv.innerHTML = '### ⚡ Charging Cost Results ' + '' + 'Energy Added to Battery' + energyToBattery.toFixed(2) + ' kWh' + 'Energy Drawn from Grid' + energyFromGrid.toFixed(2) + ' kWh' + 'Cost Per Charge Session$' + costPerSession.toFixed(2) + '' + 'Monthly Charging Cost (' + chargesPerMonth.toFixed(0) + ' sessions)$' + monthlyCost.toFixed(2) + '' + 'Annual Charging Cost$' + annualCost.toFixed(2) + '' + 'Estimated Miles Per Session' + milesPerSession.toFixed(1) + ' miles' + 'Effective Cost Per Mile$' + costPerMile.toFixed(4) + ' / mile' + ''; }

#### Formulas Used

1. Energy Added to Battery (kWh): Energy to Battery = Battery Capacity × (Target SoC% − Current SoC%) / 100

2. Energy Drawn from Grid (kWh): Energy from Grid = Energy to Battery ÷ (Charger Efficiency / 100)

3. Cost Per Session ($): Cost = Energy from Grid × (Electricity Rate ¢/kWh ÷ 100)

4. Monthly Cost ($): Monthly Cost = Cost Per Session × Charges Per Month

5. Annual Cost ($): Annual Cost = Monthly Cost × 12

6. Cost Per Mile ($): Miles Per Session = Energy to Battery × EPA Efficiency (3.5 mi/kWh) Cost Per Mile = Cost Per Session ÷ Miles Per Session

#### Assumptions & References

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