Metal Weight Calculator
Enter a known volume or weight in any single metal, alloy, wax, or resin, and instantly see the equivalent weight in every other material — gold karats and colors, silver, platinum, titanium, steel, bronze, brass, casting wax, and castable resin. Runs entirely in your browser.
Runs in your browser: every calculation uses plain arithmetic; nothing is uploaded to or stored by JewelModel.
One volume, every metal's weight
Every material here shares the same physical relationship: weight equals volume times density. This calculator uses that identity directly — enter a value in any one field, a volume or a weight in any listed metal, and it solves for the volume implied by that value, then multiplies it by every other material's density to fill in the rest.
That makes it useful for the everyday cross-metal questions a workshop runs into: what would this piece weigh in platinum instead of 14K gold, how much finished metal does a given wax or resin pattern cast to, or how does the same design compare in price across a few different alloys.
Useful for
- Estimating a piece's weight and price in a different metal before committing to a specific alloy
- Converting a wax or 3D-printed pattern's known weight into the finished metal weight it will cast to
- Comparing gold karats and colors, platinum alloys, or base metals for the same design without re-modeling it
How the calculation works
One formula drives every field on the page.
- Weight = volume × density. Density is a fixed, published property of each metal or alloy; volume is whatever the same solid shape measures out to.
- Whichever field you fill in — a volume, or a weight in one material — the calculator divides or multiplies by that material's density to recover the shape's volume, then applies every other material's density to that same volume.
What this calculator does not do
The math is exact; real metal, wax, and resin are not.
- Density figures are industry-standard nominal values for common alloy recipes — a specific caster's exact silver, copper, or zinc ratio can shift real density by a percent or two.
- It assumes a solid, fully dense shape with no internal hollowing, porosity, or stone settings — a real piece's actual weight can differ from a solid-volume estimate.
- It does not replace weighing the actual finished piece on a scale before pricing or invoicing a customer.
How to use the calculator
One known value is all it needs; no account or upload required.
- Get your model's volume
Use your CAD software's mass-properties or volume tool (e.g. Rhino's Volume command) to read the volume in mm³ — or start from a weight you already know in any material.
- Enter one known value
Type a volume, or a weight in any single metal or material, and leave every other field empty.
- Read off every material's weight
All other fields fill in instantly, computed from the same volume using each material's density.
Metal weight calculator FAQ
Why does the same 3D model weigh different amounts in different metals?
Weight is volume times density, and every metal or alloy has a different density. The same solid shape casts to a heavier piece in platinum (about 21.45 g/cm³) than in titanium (about 4.43 g/cm³) purely because platinum packs more mass into the same volume.
Where do the density values come from?
Published industry-standard specific-gravity figures for each karat and alloy color, cross-checked against jewelry casting-supplier technical data. Real alloy density varies slightly by a manufacturer's exact recipe — treat these as reliable estimates, not a certified assay.
What volume unit does this use?
Cubic millimeters (mm³), matching the units your 3D software's mass-properties tool reports when a model is built in millimeters — the standard unit for jewelry CAD.
Is my data sent to JewelModel?
No. Every calculation runs in this browser tab using plain arithmetic; nothing is uploaded or stored.
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