Metal weight converter and comparison chart
See what the same piece would weigh in a different metal.
Metal weight converter
Metal weight comparison chart
Find the metal you have in the left column, read across to the metal you want, and multiply your weight by that number.
For example, 10 g of 18ct yellow gold × 1.31 (Platinum Pt950 column) ≈ 13.1 g in platinum (Pt950).
Swipe the chart sideways to see every metal.
| Metal you have | Platinum Pt950 | Palladium Pd950 | 24ct gold | 22ct yellow | 18ct yellow | 18ct white | 14ct yellow | 9ct yellow | 9ct white | Fine silver | Sterling silver |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Platinum Pt950 | 1.00 | 0.58 | 0.94 | 0.87 | 0.76 | 0.78 | 0.67 | 0.55 | 0.63 | 0.51 | 0.51 |
| Palladium Pd950 | 1.72 | 1.00 | 1.62 | 1.50 | 1.31 | 1.34 | 1.16 | 0.95 | 1.09 | 0.88 | 0.87 |
| 24ct gold | 1.06 | 0.62 | 1.00 | 0.92 | 0.81 | 0.83 | 0.71 | 0.58 | 0.67 | 0.54 | 0.54 |
| 22ct yellow | 1.15 | 0.67 | 1.09 | 1.00 | 0.88 | 0.90 | 0.77 | 0.63 | 0.73 | 0.59 | 0.58 |
| 18ct yellow | 1.31 | 0.76 | 1.24 | 1.14 | 1.00 | 1.03 | 0.88 | 0.72 | 0.83 | 0.67 | 0.67 |
| 18ct white | 1.28 | 0.74 | 1.21 | 1.11 | 0.98 | 1.00 | 0.86 | 0.71 | 0.81 | 0.66 | 0.65 |
| 14ct yellow | 1.49 | 0.87 | 1.41 | 1.29 | 1.13 | 1.16 | 1.00 | 0.82 | 0.95 | 0.76 | 0.75 |
| 9ct yellow | 1.81 | 1.05 | 1.71 | 1.58 | 1.38 | 1.42 | 1.22 | 1.00 | 1.15 | 0.93 | 0.92 |
| 9ct white | 1.58 | 0.92 | 1.49 | 1.37 | 1.20 | 1.23 | 1.06 | 0.87 | 1.00 | 0.81 | 0.80 |
| Fine silver | 1.95 | 1.13 | 1.84 | 1.70 | 1.49 | 1.53 | 1.31 | 1.08 | 1.24 | 1.00 | 0.99 |
| Sterling silver | 1.97 | 1.15 | 1.86 | 1.71 | 1.50 | 1.54 | 1.32 | 1.09 | 1.25 | 1.01 | 1.00 |
Factors assume the same size piece. Alloys vary between makers, so treat them as a close guide. The converter above also covers 18ct rose gold, 14ct white gold and 9ct rose gold, and wax or resin models.
How it works & reference guideMeasuring tips, examples and the details behind this tool
How the converter works
It compares the same size piece in two materials, so the weight changes in step with density:
target weight = start weight × target density ÷ start density
Densities come from the published alloy data in the table below. Where makers’ alloys differ, the main answer uses the middle of the published range, and the converter adds the range when the exact alloy could move the answer by more than 3%. Each chart factor is the converter’s answer for 1 g, rounded to two decimal places.
Converting a wax or resin model
Weigh the model on its own and choose its wax or resin as the start material. The answer is the metal in the cast piece itself. Sprues and the casting button need extra metal on top of this. Your caster can tell you how much.
What it does not cover
- Price, scrap value or quotes.
- Stones, findings or solder of another metal. Weigh the metal on its own.
- Weight lost to resizing, finishing and polishing.
Not sure which metal a piece is? See what the stamp on your jewellery means.
Density figures used
A range is a spread across different makers’ alloys, not a limit for every alloy. For production work, use your supplier’s figure for the exact alloy.
| Material | Published density | Figure used | Sources |
|---|---|---|---|
| Platinum (Pt950) | 19.6–21.4 g/cm³ | 20.5 | Hoover & Strong, Palloys, Morris & Watson, Johnson Matthey, Choksi Heraeus |
| Palladium (Pd950) | 11.8–12 g/cm³ | 11.9 | Palloys, Johnson Matthey, Morris & Watson |
| Fine gold (24ct) | 19.32 g/cm³ | 19.32 | Palloys, Rio Grande |
| 22ct yellow gold | 17.8 g/cm³ | 17.8 | Palloys, Morris & Watson |
| 18ct yellow gold | 15.5–15.7 g/cm³ | 15.6 | Palloys, Morris & Watson |
| 18ct white gold | 14.9–17.1 g/cm³ | 16 | Palloys, Morris & Watson |
| 18ct rose gold | 15.3–15.7 g/cm³ | 15.5 | Palloys, Morris & Watson |
| 14ct yellow gold | 13.4–14.1 g/cm³ | 13.75 | Palloys, Morris & Watson |
| 14ct white gold | 14.5–14.9 g/cm³ | 14.7 | Palloys, Morris & Watson |
| 9ct yellow gold | 11.2–11.4 g/cm³ | 11.3 | Palloys, Morris & Watson |
| 9ct white gold | 12.6–13.4 g/cm³ | 13 | Palloys, Morris & Watson |
| 9ct rose gold | 11.1–11.4 g/cm³ | 11.25 | Palloys, Morris & Watson |
| Fine silver | 10.49 g/cm³ | 10.49 | Palloys, Rio Grande |
| Sterling silver (925) | 10.36–10.4 g/cm³ | 10.38 | Rio Grande, Palloys, Morris & Watson |
| Injection wax (Ferris 3269) | 0.96 (specific gravity) | 0.96 | Ferris |
| Printed castable resin (Formlabs Castable Wax V1) | 1.18 g/cm³ | 1.18 | Formlabs |
Source links show where each figure comes from; they are not endorsements. Wax uses its maker’s specific gravity, which works the same way as a density here.
Common questions
How do I convert a jewellery weight to a different metal?
Multiply the weight by the new metal's density, then divide by the current metal's density. The converter above does this for you: 10 g of 18ct yellow gold is about 13.14 g in platinum (Pt950).How much heavier is platinum than 18ct gold?
For the same size piece, platinum (Pt950) is about 31% heavier than 18ct yellow gold, so multiply an 18ct yellow gold weight by 1.31. Platinum alloys vary between makers, so the converter also shows the likely range.How much metal will my wax model need?
Choose your wax or resin as the start material and enter the model's weight. A 1 g injection wax (Ferris 3269) model is about 16.25 g in 18ct yellow gold. Sprues and the casting button need extra metal on top of this. Your caster can tell you how much.Why does the converter sometimes show a range?
Alloys of the same carat differ between makers. The 18ct white gold alloys we reference range from 14.9 to 17.1 g/cm³, so the converter uses the middle value and adds the range when the exact alloy could change the answer by more than 3%.Will the finished piece weigh exactly this much?
Not exactly. The converter compares the same size piece in solid metal. Stones, findings, resizing and polishing all change the final weight, so treat the answer as a close guide.
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