What this calculator does
The VinFast VF8 Charging Cost Calculator estimates how much it costs to charge your VinFast VF8 electric SUV at home or a public charger. It accounts for the battery capacity, the start and target state of charge, your electricity price, and real-world charging efficiency (energy lost as heat during charging).
How to use it
Enter your VF8 battery capacity (the VF8 Plus uses an 87.7 kWh pack), your electricity price per kWh, the current charge level, the target charge level, and the charging efficiency. Most home AC charging is around 85–92% efficient. The calculator returns the estimated cost plus the energy added to the battery and the energy actually drawn from the grid.
The formula explained
First, the energy added to the battery is the capacity times the percentage gained: C × (T - S) / 100. Because charging is not perfectly efficient, the grid must supply more than that: divide by the efficiency \eta. Finally multiply the grid energy by your price per kWh to get the cost.
Worked example
An 87.7 kWh VF8 Plus charged from 20% to 80% gains 60% of 87.7 = 52.62 kWh into the battery. At 90% efficiency the grid supplies 52.62 / 0.9 = 58.47 kWh. At 0.16/kWh the cost is 58.47 × 0.16 ≈ 9.36.
使用注意事項與精準校對原則（6 大核心守則）
📐 1. 嚴格對齊輸入量綱與單位
輸入各項數值時請務必確認量綱（例如小時、天數、金額、百分比），避免單位不匹配引發推算偏差。
🔒 2. 純前端本機毫秒級隱私保障
所有計算邏輯 100% 在您的終端瀏覽器內完成，資料絕不上傳伺服器，嚴格守護商業與個人隱私。
📊 3. 符合公認學術與產業計算模型
演算法嚴格遵循國際通用數學公式與標準計算模型，經多重情境交叉核對，數值嚴密精確。
📋 4. 一鍵複製與免登入 PDF 匯出
支援一鍵複製推算結果字串至剪貼簿，亦可直接點擊列印按鈕輸出純淨 PDF 工作報表。
🔄 5. 多情景敏感度動態對比
建議針對極端值與多組預期情景分別試算，觀察輸出數據的波動區間，輔助做出更穩健的決策。
🛡️ 6. 專業諮詢與日常參考免責聲明
本工具運算結果供日常排程、學業研習與事前參考之用，如涉及重大法規或投資決策請諮詢持證專家。