EV Charging Cost Calculator

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EV Charging Cost Calculator

Estimate how much it costs to charge your electric vehicle based on battery size, current charge level, electricity rate, and charger efficiency.

Battery Capacity (kWh)

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

Current State of Charge (%)

How charged is your battery right now?

Target State of Charge (%)

What charge level do you want to reach? (80% recommended for daily use)

Electricity Rate (¢/kWh)

Check your utility bill. U.S. average is ~16¢/kWh (2024)

Charger Efficiency (%)

Level 1/2 home chargers: ~85–92%. DC fast chargers: ~88–95%

Charger Power Output (kW) (optional – for time estimate)

Level 1 ≈ 1.4 kW | Level 2 ≈ 7.2–19.2 kW | DC Fast ≈ 50–350 kW

Calculate Charging Cost

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

// --- Read 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 electricityRate = parseFloat(document.getElementById('ev-electricity-rate').value); var chargerEffPct = parseFloat(document.getElementById('ev-charger-efficiency').value); var chargerPower = parseFloat(document.getElementById('ev-charger-power').value);

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

if (isNaN(batteryCapacity) || batteryCapacity 250) { errors.push("Battery capacity must be between 1 and 250 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("Electricity rate must be between 0.1 and 100 ¢/kWh."); } if (isNaN(chargerEffPct) || chargerEffPct 100) { errors.push("Charger efficiency must be between 50% and 100%."); } var hasPower = !isNaN(chargerPower) && chargerPower > 0; if (!isNaN(chargerPower) && chargerPower !== '' && (chargerPower 350)) { errors.push("Charger power must be between 0.1 and 350 kW."); }

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

// --- Core Calculations ---

// Energy needed to add to the battery (kWh delivered to battery) var chargeDelta = (targetCharge - currentCharge) / 100; // fraction var energyToBattery = batteryCapacity * chargeDelta; // kWh

// Charger efficiency accounts for AC→DC conversion losses var chargerEff = chargerEffPct / 100;

// Energy drawn from the grid (kWh) = energy delivered ÷ efficiency var energyFromGrid = energyToBattery / chargerEff; // kWh

// Cost = grid energy × rate (convert cents to dollars) var rateDollars = electricityRate / 100; // $/kWh var totalCost = energyFromGrid * rateDollars; // $

// Cost per kWh delivered to battery (effective cost) var effectiveCostPerKwh = totalCost / energyToBattery; // $/kWh

// Energy lost to heat/conversion var energyLost = energyFromGrid - energyTobattery; // kWh var lossPercent = (1 - chargerEff) * 100;

// Charging time estimate (if power provided) var chargingTimeHours = hasPower ? (energyFromGrid / chargerPower) : null;

// Cost per mile estimate (EPA average EV efficiency ≈ 3.5 miles/kWh) var milesPerKwh = 3.5; var milesAdded = energyToBattery * milesPerKwh; var costPerMile = totalCost / milesAdded;

// Monthly cost estimate (assume charging from 20% to 80% daily) var dailyDelta = 0.60; var dailyEnergyGrid = batteryCapacity * dailyDelta / chargerEff; var dailyCost = dailyEnergyGrid * rateDollars; var monthlyCost = dailyCost * 30;

// --- Format helpers --- function fmt(n, d) { return n.toFixed(d !== undefined ? d : 2); } function fmtTime(h) { if (h 0 ? mins + 'm' : ''); }

// --- Build result HTML --- var html = '### Charging Cost Results ';

html += ''; html += 'ParameterValue'; html += 'Energy added to battery' + fmt(energyToBattery, 2) + ' kWh'; html += 'Energy drawn from grid' + fmt(energyFromGrid, 2) + ' kWh'; html += 'Conversion loss (' + fmt(lossPercent, 1) + '%)' + fmt(energyLost, 2) + ' kWh'; html += 'Electricity rate' + fmt(electricityRate, 2) + ' ¢/kWh'; html += 'Total charging cost$' + fmt(totalCost, 2) + ''; html += 'Effective cost per kWh (delivered)$' + fmt(effectiveCostPerKwh, 4) + '/kWh'; html += 'Estimated miles added (~' + milesPerKwh + ' mi/kWh)~' + fmt(milesAdded, 0) + ' miles'; html += 'Cost per mile$' + fmt(costPerMile, 4) + '/mile'; if (chargingTimeHours !== null) { html += 'Estimated charging time~' + fmtTime(chargingTimeHours) + ''; } html += 'Est. monthly cost (20→80% daily)~$' + fmt(monthlyCost, 2) + '/month'; html += '';

// Charger type hint var chargerType = ''; if (hasPower) { if (chargerPower

#### Formulas Used

Energy to battery (kWh): Ebattery = Battery Capacity × (Target% − Current%) ÷ 100

Energy drawn from grid (kWh): Egrid = Ebattery ÷ Charger Efficiency

Total charging cost ($): Cost = Egrid × Electricity Rate ($/kWh)

Charging time (hours): Time = Egrid ÷ Charger Power (kW)

Cost per mile ($): Cost/mile = Total Cost ÷ (Ebattery × Vehicle Efficiency [mi/kWh])

#### Assumptions & References

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References

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