EV Charging Cost Calculator (Illinois Electricity Rates)

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EV Charging Cost Calculator (Illinois Electricity Rates)

Estimate how much it costs to charge your electric vehicle at home using current Illinois electricity rates. Enter your vehicle's battery size, current charge level, and target charge level to get an accurate cost estimate.

Battery Capacity (kWh)

Check your vehicle manual or manufacturer specs (e.g., Tesla Model 3 Long Range = 82 kWh)

Current State of Charge (%)

Your battery's current charge percentage

Target State of Charge (%)

Recommended: charge to 80% for daily use, 100% for long trips

Charger Efficiency (%)

Level 1 & 2 home chargers typically operate at 85–92% efficiency

Illinois Rate Plan

ComEd Residential Standard (≈ $0.1289/kWh) ComEd Time-of-Use Off-Peak (≈ $0.1350/kWh) ComEd Time-of-Use On-Peak (≈ $0.1750/kWh) Ameren Illinois Residential Standard (≈ $0.1210/kWh) Custom Rate

Select your utility provider's rate plan

Custom Electricity Rate ($/kWh)

Enter your actual rate from your electricity bill

Charging Sessions per Month

How many times per month do you perform this charge cycle?

Calculate Charging Cost

### Charging Cost Estimate

Energy Needed (usable) Energy Drawn from Grid Electricity Rate Cost Per Charge Session Monthly Charging Cost Annual Charging Cost

(function() { var rateSelect = document.getElementById('ev-rate-type'); var customGroup = document.getElementById('ev-custom-rate-group');

rateSelect.addEventListener('change', function() { customGroup.style.display = (this.value === 'custom') ? 'block' : 'none'; });

window.evCalc = function() { var resultDiv = document.getElementById('ev-result'); resultDiv.style.display = 'none';

// --- Gather inputs --- 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 efficiency = parseFloat(document.getElementById('ev-charger-efficiency').value); var sessions = parseFloat(document.getElementById('ev-monthly-sessions').value); var rateVal = rateSelect.value; var rate;

// --- 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(sessions) || sessions 365) errors.push("Monthly sessions must be between 1 and 365.");

if (rateVal === 'custom') { rate = parseFloat(document.getElementById('ev-custom-rate').value); if (isNaN(rate) || rate 1.00) errors.push("Custom rate must be between $0.01 and $1.00 per kWh."); } else { rate = parseFloat(rateVal); }

if (errors.length > 0) { alert("Please fix the following errors:\n\n" + errors.join("\n")); return; }

// --- Core Formula --- // 1. Usable energy needed = Battery Capacity × (Target% - Current%) / 100 var usableEnergy = batteryCapacity * (targetCharge - currentCharge) / 100;

// 2. Grid energy drawn = Usable Energy / (Charger Efficiency / 100) // Accounts for charger losses (heat, conversion inefficiency) var gridEnergy = usableEnergy / (efficiency / 100);

// 3. Cost per session = Grid Energy × Rate var costPerSession = gridEnergy * rate;

// 4. Monthly cost = Cost per session × Sessions per month var monthlyCost = costPerSession * sessions;

// 5. Annual cost = Monthly cost × 12 var annualCost = monthlyCost * 12;

// --- Gas comparison (avg IL gas price ~$3.20/gal, avg ICE MPG ~28) --- var gasPricePerGallon = 3.20; var avgMPG = 28; // EV efficiency: assume ~3.5 miles/kWh (national average) var evMilesPerKwh = 3.5; var milesPerSession = usableEnergy * evMilesPerKwh; var gasEquivalentCost = (milesPerSession / avgMPG) * gasPricePerGallon; var savings = gasEquivalentCost - costPerSession;

// --- Display results --- document.getElementById('ev-energy-needed').textContent = usableEnergy.toFixed(2) + " kWh"; document.getElementById('ev-energy-grid').textContent = gridEnergy.toFixed(2) + " kWh"; document.getElementById('ev-rate-display').textContent = "$" + rate.toFixed(4) + " / kWh"; document.getElementById('ev-cost-per-session').textContent = "$" + costPerSession.toFixed(2); document.getElementById('ev-monthly-cost').textContent = "$" + monthlyCost.toFixed(2); document.getElementById('ev-annual-cost').textContent = "$" + annualCost.toFixed(2);

var compHtml = "⚡ vs. ⛽ Gas Comparison" +
"Estimated miles this charge: " + milesPerSession.toFixed(0) + " mi" +
"Gas cost for same distance (" + avgMPG + " MPG @ $" + gasPricePerGallon.toFixed(2) + "/gal): " +
"$" + gasEquivalentCost.toFixed(2) + "" +
(savings > 0
? "You save $" + savings.toFixed(2) + " per session vs. gasoline."
"Gas would be $" + Math.abs(savings).toFixed(2) + " cheaper per session at current rates."); document.getElementById('ev-gas-comparison').innerHTML = compHtml;

resultDiv.style.display = 'block'; }; })();

#### Formula

Step 1 – Usable Energy Needed (kWh): Usable Energy = Battery Capacity (kWh) × (Target Charge% − Current Charge%) ÷ 100

Step 2 – Grid Energy Drawn (kWh): Grid Energy = Usable Energy ÷ (Charger Efficiency ÷ 100) This accounts for energy lost as heat during AC→DC conversion in the charger and onboard charger unit.

Step 3 – Cost Per Session ($): Cost Per Session = Grid Energy (kWh) × Electricity Rate ($/kWh)

Step 4 – Monthly Cost ($): Monthly Cost = Cost Per Session × Sessions Per Month

Step 5 – Annual Cost ($): Annual Cost = Monthly Cost × 12

#### Assumptions & References

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