EV Home Charging Cost Calculator

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EV Home Charging Cost Calculator

Estimate your monthly and annual home EV charging costs based on your vehicle's battery capacity, local electricity rate, and how much you drive.

Battery Capacity (kWh)

Full usable battery size of your EV (e.g. Tesla Model 3 Long Range = 75 kWh)

Electricity Rate (¢/kWh)

Check your utility bill for your rate. US average is ~13–16 ¢/kWh.

Average Miles Driven Per Day

Your typical daily driving distance.

EV Efficiency (miles per kWh)

Found in your vehicle specs or EPA rating (typical range: 2.5–4.5 mi/kWh).

Charger Efficiency (%)

Energy lost during charging. Level 2 chargers are typically 85–95% efficient.

Calculate

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

const batteryCapacity = parseFloat(document.getElementById('ev-battery-capacity').value); const electricityRate = parseFloat(document.getElementById('ev-electricity-rate').value); const milesPerDay = parseFloat(document.getElementById('ev-miles-per-day').value); const efficiency = parseFloat(document.getElementById('ev-efficiency').value); const chargerEfficiency = parseFloat(document.getElementById('ev-charger-efficiency').value);

// --- Validation --- const errors = []; if (isNaN(batteryCapacity) || batteryCapacity 100) errors.push("Charger efficiency must be between 50% and 100%.");

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

// --- Core Formulas --- // kWh needed from grid per day = (miles/day ÷ mi/kWh) ÷ (charger efficiency / 100) const kWhFromBattery = milesPerDay / efficiency; // net kWh consumed by motor const kWhFromGrid = kWhFromBattery / (chargerEfficiency / 100); // gross kWh drawn from wall const costPerDay = (kWhFromGrid * electricityRate) / 100; // rate in cents → dollars const costPerWeek = costPerDay * 7; const costPerMonth = costPerDay * 30.44; // average days/month const costPerYear = costPerDay * 365.25;

// Full charge cost (empty → full) const fullChargeCost = (batteryCapacity / (chargerEfficiency / 100) * electricityRate) / 100;

// Cost per mile const costPerMile = costPerDay / milesPerDay;

// Annual kWh drawn from grid const annualKWh = kWhFromGrid * 365.25;

// --- Format helpers --- function fmt(val, decimals=2) { return val.toLocaleString('en-US', {minimumFractionDigits: decimals, maximumFractionDigits: decimals}); }

resultDiv.style.display = 'block'; resultDiv.innerHTML = ` ### ⚡ Your EV Charging Cost Estimate

MetricValue Daily Charging Cost$${fmt(costPerDay)} Weekly Charging Cost$${fmt(costPerWeek)} Monthly Charging Cost$${fmt(costPerMonth)} Annual Charging Cost$${fmt(costPerYear)} Cost per Mile$${fmt(costPerMile, 4)} Cost for a Full Charge$${fmt(fullChargeCost)} Daily kWh Drawn from Grid${fmt(kWhFromGrid)} kWh Annual kWh Drawn from Grid${fmt(annualKWh)} kWh

Based on ${fmt(milesPerDay, 0)} miles/day at ${fmt(efficiency, 1)} mi/kWh efficiency, ${fmt(chargerEfficiency, 0)}% charger efficiency, and ${fmt(electricityRate, 1)} ¢/kWh.

`; }

#### Formulas Used

1. Net kWh consumed per day (motor energy): kWhbattery = Miles per Day ÷ Efficiency (mi/kWh)

2. Gross kWh drawn from grid per day (wall energy): kWhgrid = kWhbattery ÷ (Charger Efficiency / 100)

3. Daily charging cost: Costday ($) = kWhgrid × Electricity Rate (¢/kWh) ÷ 100

4. Monthly cost: Costmonth = Costday × 30.44

5. Annual cost: Costyear = Costday × 365.25

6. Full charge cost: Costfull ($) = (Battery Capacity ÷ Charger Efficiency) × Rate ÷ 100

7. Cost per mile: Costmile = Costday ÷ Miles per Day

#### Assumptions & References

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References

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