EV Home Charging Cost Calculator (Virginia Electricity Rates)

ANA›Life Services Authority›National Calculator Authority›EV Home Charging Cost Calculator (Virginia Electricity Rates)

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EV Home Charging Cost Calculator (Virginia Electricity Rates)

Estimate your monthly and annual cost to charge your electric vehicle at home using current Virginia residential electricity rates.

Battery Capacity (kWh)

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

EV Efficiency (miles per kWh)

Average efficiency of your EV (typical range: 2.5–4.5 mi/kWh)

Miles Driven Per Month

Average monthly driving distance (U.S. average ≈ 1,183 miles/month)

Charger Efficiency (%)

Level 2 chargers are typically 85–95% efficient; Level 1 ≈ 80–85%

Virginia Electricity Rate Type

Dominion Energy VA – Standard Residential (≈ $0.1317/kWh) Appalachian Power (AEP Virginia) – Standard Residential (≈ $0.1200/kWh) Dominion Energy VA – Off-Peak EV Rate (≈ $0.1100/kWh) Custom Rate

Select your utility provider or choose a custom rate

Custom Electricity Rate ($/kWh)

Effective Rate ($/kWh)

Auto-filled from rate type selection above

Calculate Charging Cost

function evUpdateRate() { var sel = document.getElementById('ev-rate-type').value; var customField = document.getElementById('ev-custom-rate-field'); var displayRate = document.getElementById('ev-display-rate'); if (sel === 'custom') { customField.style.display = 'block'; displayRate.removeAttribute('readonly'); displayRate.style.background = ''; displayRate.value = ''; } else { customField.style.display = 'none'; displayRate.setAttribute('readonly', true); displayRate.style.background = '#f0f0f0'; displayRate.value = sel; } }

function evCalc() { var resultDiv = document.getElementById('ev-result'); resultDiv.style.display = 'block'; resultDiv.className = 'calc-result';

// --- Gather inputs --- var batteryCapacity = parseFloat(document.getElementById('ev-battery-capacity').value); var efficiency = parseFloat(document.getElementById('ev-efficiency').value); var milesPerMonth = parseFloat(document.getElementById('ev-miles-per-month').value); var chargerEffPct = parseFloat(document.getElementById('ev-charger-efficiency').value); var rateType = document.getElementById('ev-rate-type').value; var displayRate = parseFloat(document.getElementById('ev-display-rate').value); var customRate = parseFloat(document.getElementById('ev-custom-rate').value);

// --- Validation --- var errors = []; if (isNaN(batteryCapacity) || batteryCapacity 200) errors.push('Battery capacity must be between 10 and 200 kWh.'); if (isNaN(efficiency) || efficiency 10) errors.push('EV efficiency must be between 1 and 10 miles/kWh.'); if (isNaN(milesPerMonth) || milesPerMonth 10000) errors.push('Miles per month must be between 1 and 10,000.'); if (isNaN(chargerEffPct) || chargerEffPct 100) errors.push('Charger efficiency must be between 50% and 100%.');

var rate; if (rateType === 'custom') { rate = customRate; if (isNaN(rate) || rate 1.00) errors.push('Custom rate must be between $0.01 and $1.00 per kWh.'); } else { rate = parseFloat(rateType); if (isNaN(rate)) errors.push('Please select a valid rate type.'); }

if (errors.length > 0) { resultDiv.className = 'calc-result calc-error'; resultDiv.innerHTML = 'Please fix the following errors:' + errors.map(function(e){ return ''; }).join('') + ''; return; }

// --- Core Calculations --- // Charger efficiency as decimal var chargerEff = chargerEffPct / 100;

// kWh drawn from wall per mile (accounts for charging losses) // kWh_per_mile_wall = 1 / (efficiency * chargerEff) var kWhPerMileWall = 1 / (efficiency * chargerEff);

// Monthly kWh drawn from wall var monthlyKWhWall = milesPerMonth * kWhPerMileWall;

// Monthly cost var monthlyCost = monthlyKWhWall * rate;

// Annual figures var annualKWhWall = monthlyKWhWall * 12; var annualCost = monthlyCost * 12;

// Cost per mile var costPerMile = monthlyCost / milesPerMonth;

// Full charge cost (battery capacity / charger efficiency * rate) var fullChargeCost = (batteryCapacity / chargerEff) * rate;

// Full charge range var fullChargeRange = batteryCapacity * efficiency;

// Number of full charges per month var chargesPerMonth = monthlyKWhWall / (batteryCapacity / chargerEff);

// --- Format helpers --- function fmt2(n){ return n.toFixed(2); } function fmt3(n){ return n.toFixed(3); } function fmt1(n){ return n.toFixed(1); } function fmtInt(n){ return Math.round(n).toLocaleString(); }

resultDiv.innerHTML = '### ⚡ EV Charging Cost Results ' + '' + 'Monthly kWh from Wall' + fmt1(monthlyKWhWall) + ' kWh' + 'Monthly Charging Cost$' + fmt2(monthlyCost) + '' + 'Annual kWh from Wall' + fmtInt(annualKWhWall) + ' kWh' + 'Annual Charging Cost$' + fmt2(annualCost) + '' + 'Cost Per Mile$' + fmt3(costPerMile) + '/mile' + 'Cost for One Full Charge$' + fmt2(fullChargeCost) + '' + 'Full Charge Range' + fmt1(fullChargeRange) + ' miles' + 'Approx. Full Charges/Month' + fmt1(chargesPerMonth) + '' + 'Electricity Rate Used$' + rate.toFixed(4) + '/kWh' + ''; }

#### Formulas Used

Wall kWh per mile = 1 ÷ (EV Efficiency × Charger Efficiency)

Monthly kWh (from wall) = Miles per Month × Wall kWh per Mile

Monthly Cost ($) = Monthly kWh (wall) × Electricity Rate ($/kWh)

Annual Cost ($) = Monthly Cost × 12

Cost per Mile ($) = Monthly Cost ÷ Miles per Month

Full Charge Cost ($) = (Battery Capacity ÷ Charger Efficiency) × Rate

Full Charge Range (miles) = Battery Capacity (kWh) × EV Efficiency (mi/kWh)

Charger efficiency accounts for heat losses during AC-to-DC conversion in the onboard charger.

#### Assumptions & References

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