Home Charging Cost Calculator

ANA›Life Services Authority›National Calculator Authority›Home Charging Cost Calculator

.calc-container { max-width: 640px; margin: 2rem 0; padding: 1.5rem; background: #fff; border: 1px solid #ddd; border-radius: 8px; box-shadow: 0 1px 3px rgba(0,0,0,0.06); font-family: system-ui, -apple-system, sans-serif; } .calc-container h3 { font-family: Georgia, serif; font-size: 1.15rem; color: #1a1a1a; margin-bottom: 1rem; padding-bottom: 0.5rem; border-bottom: 2px solid var(--ac, #3d5a80); } .calc-row { display: flex; align-items: center; gap: 0.75rem; margin-bottom: 0.75rem; flex-wrap: wrap; } .calc-row label { min-width: 160px; font-size: 0.9rem; color: #333; font-weight: 500; } .calc-row input[type="number"], .calc-row select { flex: 1; min-width: 120px; max-width: 200px; padding: 0.5rem 0.6rem; border: 1px solid #ccc; border-radius: 4px; font-size: 0.9rem; font-family: system-ui, sans-serif; color: #1a1a1a; background: #fafaf8; } .calc-row input:focus, .calc-row select:focus { outline: none; border-color: var(--ac, #3d5a80); box-shadow: 0 0 0 2px rgba(26,74,138,0.12); } .calc-row .unit { font-size: 0.82rem; color: #888; min-width: 30px; } .calc-btn { display: inline-block; margin-top: 0.5rem; padding: 0.55rem 1.5rem; background: var(--ac, #3d5a80); color: #fff; border: none; border-radius: 4px; font-size: 0.9rem; font-weight: 600; cursor: pointer; font-family: system-ui, sans-serif; } .calc-btn:hover { opacity: 0.9; } .calc-result { margin-top: 1.25rem; padding: 1rem 1.25rem; background: #f0f6fc; border-left: 3px solid var(--ac, #3d5a80); border-radius: 0 6px 6px 0; display: none; } .calc-result.visible { display: block; } .calc-result-label { font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.06em; color: #666; margin-bottom: 0.25rem; } .calc-result-value { font-size: 1.6rem; font-weight: 700; color: var(--ac, #3d5a80); } .calc-result-detail { font-size: 0.85rem; color: #555; margin-top: 0.5rem; line-height: 1.5; } .calc-note { margin-top: 1rem; font-size: 0.8rem; color: #888; font-style: italic; } .calc-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; margin-top: 0.75rem; } .calc-grid-item { padding: 0.6rem 0.8rem; background: #f8f9fa; border-radius: 4px; border: 1px solid #eee; } .calc-grid-item .label { font-size: 0.75rem; color: #888; text-transform: uppercase; letter-spacing: 0.04em; } .calc-grid-item .value { font-size: 1.1rem; font-weight: 600; color: #1a1a1a; } @media (max-width: 720px) { .calc-row { flex-direction: column; align-items: flex-start; gap: 0.3rem; } .calc-row label { min-width: auto; } .calc-row input[type="number"], .calc-row select { max-width: 100%; width: 100%; } .calc-grid { grid-template-columns: 1fr; } } .calc-chart { margin: 1rem 0; text-align: center; } .calc-chart svg { max-width: 100%; height: auto; } .calc-chart-legend { display: flex; flex-wrap: wrap; justify-content: center; gap: 0.6rem 1.2rem; margin-top: 0.6rem; font-size: 0.8rem; color: #555; } .calc-chart-legend span { display: inline-flex; align-items: center; gap: 0.3rem; } .calc-chart-legend i { display: inline-block; width: 10px; height: 10px; border-radius: 2px; font-style: normal; } .calc-related { max-width: 640px; margin: 2rem 0 1rem; padding: 1.25rem 1.5rem; background: #f8f9fa; border: 1px solid #e8e8e8; border-radius: 8px; } .calc-related h3 { font-family: Georgia, serif; font-size: 1rem; color: #1a1a1a; margin: 0 0 0.75rem; padding-bottom: 0.4rem; border-bottom: 2px solid var(--ac, #3d5a80); } .calc-related-list { list-style: none; padding: 0; margin: 0 0 0.75rem; display: grid; grid-template-columns: 1fr 1fr; gap: 0.4rem 1.5rem; } .calc-related-list li a { font-size: 0.88rem; color: var(--ac, #3d5a80); text-decoration: none; } .calc-related-list li a:hover { text-decoration: underline; } .calc-browse-all { margin: 0.5rem 0 0; font-size: 0.9rem; font-weight: 600; } .calc-browse-all a { color: var(--ac, #3d5a80); text-decoration: none; } .calc-browse-all a:hover { text-decoration: underline; } @media (max-width: 720px) { .calc-related-list { grid-template-columns: 1fr; } }

Home Charging Cost Calculator

Estimate how much it costs to charge your electric vehicle at home, including per-session, monthly, and annual costs.

Battery Capacity (kWh)

Total usable battery capacity of your EV (check your owner's manual)

Current State of Charge (%)

How charged is your battery right now?

Target State of Charge (%)

Most manufacturers recommend charging to 80% for daily use

Electricity Rate (¢/kWh)

Check your utility bill for your local rate (US average ~16¢/kWh)

Charger Efficiency (%)

Level 1/2 chargers typically 85–95% efficient due to heat loss

Charging Sessions per Month

How many times per month do you charge at home?

Calculate Charging Cost

function homCalc() { var resultDiv = document.getElementById('hom-result');

var batterySize = parseFloat(document.getElementById('hom-battery-size').value); var currentSoc = parseFloat(document.getElementById('hom-current-soc').value); var targetSoc = parseFloat(document.getElementById('hom-target-soc').value); var electricityRate = parseFloat(document.getElementById('hom-electricity-rate').value); var chargerEff = parseFloat(document.getElementById('hom-charger-efficiency').value); var sessionsPerMonth = parseFloat(document.getElementById('hom-sessions-per-month').value);

// --- Validation --- var errors = []; if (isNaN(batterySize) || batterySize 200) errors.push("Battery capacity must be between 1 and 200 kWh."); if (isNaN(currentSoc) || currentSoc 100) errors.push("Current state of charge must be between 0% and 100%."); if (isNaN(targetSoc) || targetSoc 100) errors.push("Target state of charge must be between 0% and 100%."); if (!isNaN(currentSoc) && !isNaN(targetSoc) && targetSoc 100) errors.push("Electricity rate must be between 0.1 and 100 ¢/kWh."); if (isNaN(chargerEff) || chargerEff 100) errors.push("Charger efficiency must be between 50% and 100%."); if (isNaN(sessionsPerMonth) || sessionsPerMonth 365) errors.push("Charging sessions per month must be between 1 and 365.");

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

// --- Core Calculations --- // Energy needed from the battery (kWh) var energyNeeded = batterySize * (targetSoc - currentSoc) / 100;

// Energy drawn from the wall (kWh) — accounts for charger losses var energyFromWall = energyNeeded / (chargerEff / 100);

// Cost per session ($) var costPerSession = energyFromWall * (electricityRate / 100);

// Monthly cost ($) var monthlyCost = costPerSession * sessionsPerMonth;

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

// Cost per kWh delivered to battery ($) var effectiveCostPerKwh = (electricityRate / 100) / (chargerEff / 100);

// Charging loss per session (kWh) var chargingLoss = energyFromWall - energyNeeded;

// --- Display Results --- resultDiv.innerHTML = '### Charging Cost Estimate ' + '' + 'Energy Added to Battery' + energyNeeded.toFixed(2) + ' kWh' + 'Energy Drawn from Wall' + energyFromWall.toFixed(2) + ' kWh' + 'Charging Loss (heat)' + chargingLoss.toFixed(2) + ' kWh' + 'Effective Cost per kWh Delivered$' + effectiveCostPerKwh.toFixed(4) + '' + 'Cost per Charging Session$' + costPerSession.toFixed(2) + '' + 'Monthly Charging Cost (' + sessionsPerMonth.toFixed(0) + ' sessions)$' + monthlyCost.toFixed(2) + '' + 'Annual Charging Cost$' + annualCost.toFixed(2) + '' + ''; }

#### Formulas Used

Energy Needed (kWh) = Battery Capacity × (Target SoC% − Current SoC%) ÷ 100

Energy from Wall (kWh) = Energy Needed ÷ (Charger Efficiency ÷ 100)

Cost per Session ($) = Energy from Wall × (Electricity Rate ÷ 100)

Monthly Cost ($) = Cost per Session × Sessions per Month

Annual Cost ($) = Monthly Cost × 12

Effective Cost per kWh Delivered ($) = (Electricity Rate ÷ 100) ÷ (Charger Efficiency ÷ 100)

#### Assumptions & References

More Calculators

References

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