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Calculate gold value by weight and karat purity using a reference spot price.
Gold value is determined by weight, purity (karat), and the current spot price per troy ounce. Pure gold is 24 karats; 18K gold is 75% pure; 14K gold is 58.3% pure. One troy ounce equals 31.1035 grams.
⚠ Reference price for educational use. Check live prices at kitco.com before buying or selling.
Estimated Melt Value
| Karat | Purity | Common Use |
|---|---|---|
| 24K | 100% | Investment coins/bars |
| 22K | 91.7% | Bullion coins |
| 21K | 87.5% | Middle Eastern jewelry |
| 18K | 75.0% | Fine jewelry (US/EU) |
| 14K | 58.3% | Common US jewelry |
| 10K | 41.7% | Budget jewelry |
| 9K | 37.5% | UK budget jewelry |
Formula
Gold Value = Weight (troy oz) × Purity (decimal) × Spot Price (per troy oz)Weight (troy oz) = Mass of the gold item converted to troy ounces (1 troy oz = 31.1035g)
Purity (decimal) = Gold content as a decimal (24K=1.0, 18K=0.75, 14K=0.583)
Spot Price = Current market price per troy ounce of pure gold
Worked Example
20 grams of 18K gold at $2,000/troy oz
Did you know? One troy ounce equals 31.1035 grams — about 10% heavier than a standard avoirdupois ounce (28.3495g). Gold has served as a monetary store of value for over 5,000 years, and central banks collectively hold over 35,000 metric tons of gold reserves (source: World Gold Council, 2024).
Sources
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