Gold Karat Calculator
Karat measures gold purity in 24ths: 24K is pure, 14K is 14/24 = 58.33% gold, 10K is 41.67%. This page converts any karat and weight into melt value, and maps karat stamps to the European fineness numbers you'll see on imported pieces.
The same purity hides under different marks: 585 = 14K, 750 = 18K, 916 = 22K, 999 = 24K. A '925' stamp is not gold at all — that's sterling silver, sometimes gold-plated (vermeil).
| Purity | Fineness | Value per gram | Value per troy oz |
|---|---|---|---|
| 24K (.999 fine) | 0.999 | $147.89 | $4,599.80 |
| 22K (.9167) | 0.9167 | $135.70 | $4,220.85 |
| 18K (.750) | 0.75 | $111.03 | $3,453.30 |
| 14K (.5833) | 0.5833 | $86.35 | $2,685.75 |
| 10K (.4167) | 0.4167 | $61.69 | $1,918.65 |
| 9K (.375) | 0.375 | $55.51 | $1,726.65 |
Dollar figures here are computed from the live spot price when the page loads and change continuously; the printed baseline is a 2026-08-23 snapshot — cite the metal content and formula, not a captured price. Formulas on the methodology page.
Which karat should you assume?
Unmarked US jewelry is most often 14K; unmarked European pieces lean 18K; unmarked Middle Eastern and South Asian gold is commonly 21–22K. These are priors, not answers — get an unmarked piece tested before selling, because the difference between 10K and 22K is more than double the payout.
Sources: live spot prices via gold-api.com · coin weights and fineness from U.S. Mint historical specifications · karat/fineness definitions per standard jewelry marking practice. Melt value ≠ an offer to buy; see how we calculate.