SpotPlatinum Calculator
Estimate the platinum content and melt value of jewelry using PT950, PT900 or PT850 specifications.
Platinum · $1,492.20 USD/ozt · $47.98 USD/gMarket quote · Gold API · 2026-11-14 14:09 UTC
Your item
100% Melt Value
9.5 g fine platinum
- Estimated buyer payout · 80%
- $364.61
- Illustrative payout range · 70–100%
- $319.04 – $455.77
PT950 platinum price by weight
| Weight | Melt value (USD) |
|---|---|
| 1 g | $45.58 |
| 5 g | $227.88 |
| 10 g | $455.77 |
| 20 g | $911.53 |
| 30 g | $1,367.30 |
| 40 g | $1,823.06 |
| 50 g | $2,278.83 |
| 100 g | $4,557.66 |
How to calculate melt value
Melt value = weight in grams × purity fraction × (USD spot price per ozt ÷ 31.1034768)
At PT950 purity, 10 g contains 9.5000 g of fine platinum. Use 31.1034768 g per troy ounce or 1.55517384 g per pennyweight.
Estimated payout = melt value × selected payout percentage.
Gold Hallmark & Stamp Guide
| Stamp | Karat | Gold content |
|---|---|---|
| 999 | 24K | 99.9% |
| 916 | 22K | 91.6% |
| 875 | 21K | 87.5% |
| 750 | 18K | 75.0% |
| 585 | 14K | 58.5% |
| 417 | 10K | 41.7% |
| 375 | 9K / 9ct | 37.5% |
Frequently asked questions
What does PT950 mean?
PT950 means 950 parts platinum per thousand by weight, or 95%.
How much fine platinum is in 10 g of PT900?
10 × 0.900 gives 9 grams of platinum.
Can I select PT850?
Yes. PT850 applies an 85% platinum fraction to the weight entered.
Can this value a catalytic converter?
Only use this calculator for a known platinum alloy weight and purity. Catalytic converters require recovery or assay data for their precious metal content.
Will a buyer pay the full platinum spot value?
The final offer depends on tested purity, net weight, payable percentage and any fees.