Metal Conversion Calculator
How much the same piece weighs in a different metal.
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What this tool does
Calculates the weight of an identical piece (same volume) in a different metal, using typical densities.
When to use it
Use it when a model or sample exists in one metal and you need the equivalent weight in another — for example gold to sterling silver.
What each input means
- From / To metal
- Choose from the typical-density list, or choose “Custom” and enter your alloy’s density.
Formula and method
- Volume = weight ÷ density of the first metal
- New weight = volume × density of the second metal
- Equivalent: new weight = weight × (density₂ ÷ density₁)
Worked example
Converting a 10 g piece in 18K gold to sterling silver:
- Volume = 10 ÷ 15.5 = 0.645 cm³
- Silver weight = 0.645 × 10.36 = 6.68 g
≈ 6.68 g in sterling silver
Limitations
- Densities are typical values; real alloys differ. Use your alloy’s datasheet for accuracy.
- Casting shrinkage and finishing change the final weight.
Frequently asked questions
Why do alloys of the same karat have different densities?
The non-gold part (silver, copper, zinc, palladium…) changes the density. White, yellow and rose 18K gold therefore weigh slightly differently.
Related tools
- Casting Weight Calculator — Estimate finished metal weight from model volume or from a wax/resin pattern weight.
- Metal Density Calculator — Weight, volume or density from the other two, with a reference density list.
- Jewelry Weight Calculator — Estimate the weight of rings, wire, sheet, tube and beads from dimensions.