Charging Cost Calculator
ANA›Life Services Authority›National Calculator Authority›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; } }
Charging Cost Calculator
Estimate how much it costs to charge your electric vehicle from your current battery level to your target level.
Battery Capacity (kWh)
Current Charge Level (%)
Target Charge Level (%)
Electricity Rate ($/kWh)
Charger Efficiency (%)
Calculate
function chaCalc() { var resultDiv = document.getElementById('cha-result');
var batterySize = parseFloat(document.getElementById('cha-battery-size').value); var currentCharge = parseFloat(document.getElementById('cha-current-charge').value); var targetCharge = parseFloat(document.getElementById('cha-target-charge').value); var electricityRate = parseFloat(document.getElementById('cha-electricity-rate').value); var chargerEfficiency = parseFloat(document.getElementById('cha-charger-efficiency').value);
// Validation if (isNaN(batterySize) || batterySize 500) { resultDiv.innerHTML = 'Please enter a valid battery capacity between 1 and 500 kWh.'; resultDiv.style.display = 'block'; return; } if (isNaN(currentCharge) || currentCharge 100) { resultDiv.innerHTML = 'Current charge level must be between 0% and 100%.'; resultDiv.style.display = 'block'; return; } if (isNaN(targetCharge) || targetCharge 100) { resultDiv.innerHTML = 'Target charge level must be between 0% and 100%.'; resultDiv.style.display = 'block'; return; } if (targetCharge Target charge level must be greater than current charge level.'; resultDiv.style.display = 'block'; return; } if (isNaN(electricityRate) || electricityRate 10) { resultDiv.innerHTML = 'Please enter a valid electricity rate between $0.01 and $10.00 per kWh.'; resultDiv.style.display = 'block'; return; } if (isNaN(chargerEfficiency) || chargerEfficiency 100) { resultDiv.innerHTML = 'Charger efficiency must be between 50% and 100%.'; resultDiv.style.display = 'block'; return; }
// Core calculations var chargeDelta = (targetCharge - currentCharge) / 100; // fraction to add var energyNeeded = batterySize * chargeDelta; // kWh stored in battery var efficiencyFactor = chargerEfficiency / 100; var energyDrawn = energyNeeded / efficiencyFactor; // kWh drawn from grid var totalCost = energyDrawn * electricityRate; // $ var energyLost = energyDrawn - energyNeeded; // kWh lost as heat
resultDiv.innerHTML = '### Charging Cost Results ' + '' + 'Energy Added to Battery' + '' + energyNeeded.toFixed(2) + ' kWh' + 'Energy Drawn from Grid' + '' + energyDrawn.toFixed(2) + ' kWh' + 'Energy Lost (Heat/Conversion)' + '' + energyLost.toFixed(2) + ' kWh' + 'Electricity Rate' + '$' + electricityRate.toFixed(3) + ' / kWh' + 'Total Charging Cost' + '$' + totalCost.toFixed(2) + '' + '' + 'Charging from ' + currentCharge + '% to ' + targetCharge + '% on a ' + batterySize + ' kWh battery at ' + chargerEfficiency + '% charger efficiency.
';
resultDiv.style.display = 'block'; }
#### Formula
Energy Added to Battery (kWh) = Battery Capacity × (Target% − Current%) / 100 Energy Drawn from Grid (kWh) = Energy Added ÷ (Charger Efficiency / 100) Total Charging Cost ($) = Energy Drawn from Grid × Electricity Rate ($/kWh)
#### Assumptions & References
- Battery capacity refers to the usable capacity of the EV battery pack in kilowatt-hours (kWh).
- Reference: U.S. Energy Information Administration (EIA) — Electric Power Monthly, 2024.
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