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⚡ Gold Melt Value 計算機

專業免費的 Gold Melt Value 計算機。純前端本機毫秒級計算、零資料上傳、極致隱私保護。提供詳細公式推導、實例示範與常見問答。

即時推算結果 (Computed Output)
$375.09 intrinsic metal value
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What Is the Gold Melt Value?

The melt value of gold is the intrinsic worth of the pure gold metal contained in an item, based purely on its weight, purity, and the current market spot price. It ignores craftsmanship, brand, numismatic premium, and dealer margins — it is simply what the raw metal is worth if melted down. This makes it the baseline reference price when buying or selling scrap jewelry, coins, or bullion.

How to Use This Calculator

Enter the weight of your gold item and choose the unit (troy ounce, gram, or pennyweight). Select the karat purity stamped on the piece — common values are 24K (pure), 22K, 18K, 14K, and 10K. Finally, enter the current spot price per troy ounce, which you can find from any live gold-price source. The calculator converts your weight to troy ounces, scales it by the gold fineness, and multiplies by the spot price.

V = W_{ozt} × ((Karat) ÷ (24)) × Spot Price
where W_{ozt} = Weight (ozt)

The Formula Explained

First the weight is converted to troy ounces: 1 troy ounce equals 31.1034768 grams or 20 pennyweight. The fineness is the karat divided by 24, so 14K gold is 14/24 = 0.58333, or about 58.3% pure gold. Multiplying weight in troy ounces by fineness gives the pure gold content, and multiplying that by the spot price gives the melt value.

Worked Example

Suppose you have 10 grams of 14K gold and the spot price is 2,000 per troy ounce. Convert:

10 / 31.1034768 = 0.321507 ozt
Fineness:
14/24 = 0.583333
Pure gold:
0.321507 × 0.583333 = 0.187546 ozt
Melt value:
0.187546 × 2000 = 375.09
375.09.

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。

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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。

常見問題 (FAQ)

Does this include making fees or markups?
No — melt value reflects only the metal content. Dealers pay below melt and retailers charge above it.
Why use troy ounces?
Precious metals are traded in troy ounces, which are heavier than standard (avoirdupois) ounces — 31.1 g versus 28.35 g.
Is 14K really 58.3%?
By the karat definition, \(14/24 = 58.33\%\). Some references round to 58.5% for hallmarking standards; this tool uses the exact karat fraction.