A free jewellery metal calculator and casting assistant. Answer a few questions about your metal and your piece to get the metal to melt, the hallmark, the alloy mix, melting and pouring temperatures and a cost estimate. Then take the bench test.
Answer the questions on the left. Your casting sheet builds on the right.
What you can do with Metal, Karat & Casting Calculator.
Convert wax model weight to metal weight using specific gravity.
Gold purity in karat, fineness and BIS hallmark grade.
How much fine gold, silver and copper make up your alloy.
Melting range, pouring temperature, sprue and button allowance.
Metal cost from today's rate you enter.
A challenge to test your jewellery metal knowledge.
Get started in a few steps.
Practical benefits for students and designers.
Under-estimating metal can ruin a cast. The calculator includes sprue and button allowance.
See how karat, fineness and hallmark relate.
Quick costing helps students price designs for juries and clients.
The bench test covers real casting knowledge.
Made for learners and working designers.
The ideas behind the calculator, in brief.
24K is pure gold. 18K means 18 parts gold out of 24, or 750 fineness. 22K is 916 fineness, common in Indian jewellery.
Each metal has a density. Multiply wax weight by the metal's specific gravity ratio to estimate the metal weight of a cast.
Gold is alloyed with silver, copper, zinc or palladium to change colour and hardness: yellow, rose and white gold.
A wax model is invested in plaster, burnt out, and the cavity is filled with molten metal.
Study these topics in depth at IMS Design & Innovation Academy, Noida.
More free labs from DIA Design Labs.
It calculates metal weights, purity, alloy mixes and casting allowances for jewellery making, usually starting from a wax model or finished weight.
Multiply the wax weight by the metal's specific gravity ratio to wax. For 18K yellow gold the ratio is roughly 15 to 16 times the wax weight.
22K gold is 91.6% pure and softer. 18K is 75% pure, harder and better for stone-set jewellery.
They are typical industry values for learning. Always follow your casting house or supplier data sheet.
Yes. It is free and works on phone and desktop.
Casting, metalsmithing and alloy work are taught in the B.Sc. Jewellery Design programme at IMS DIA.
Study design at IMS Design & Innovation Academy. Explore the course, take the DIA Design Aptitude Test (D-DAT) or apply now.