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Calculate glaze batch weight from unity formula and raw material analysis. Scale recipes to any batch size for consistent studio pottery glazing.
Create kiln firing schedules with ramp rates, hold times, and cone temperatures. Plan bisque and glaze firings for electric and gas pottery kilns.
Calculate clay shrinkage percentage from wet, dry, and fired dimensions. Plan pottery sizes accurately for clay bodies from leather-hard through glaze firing.
Karat expresses parts of 24 that are fine gold. 14k = 14/24 = 58.33% Au; 18k = 75% Au. Remainder is copper, silver, and other alloying metals.
Fine gold weight = total weight × (karat / 24)Yellow gold adds copper and silver in ratios controlling color. White gold adds palladium, nickel, or zinc. Rose gold increases copper proportion for pink tone.
Alloy weight = total − fine metal; split by target Cu/Ag ratioSterling is 92.5% Ag + 7.5% Cu. Pt 950 is 95% Pt + 5% ruthenium or cobalt. Calculate each component by weight percent of the total batch.
Component weight = batch weight × (component % / 100)Updated: July 2026
Need 58.33 g fine gold + 41.67 g alloy. Classic 14k yellow uses ~58.3% Au, 30% Cu, 11.7% Ag — calculator splits alloy portion into 30 g Cu and 11.67 g Ag.
75 g Au + 25 g alloy in 100 g batch. Rose alloy: 75% Cu, 25% Ag of the alloy portion gives 18.75 g Cu and 6.25 g Ag for a warm pink cast.
Standard sterling: 925 g fine silver + 75 g copper per kg. Calculator confirms ratios before melting ingot for rolling sheet.
Gold (19.3 g/cm³) and copper (8.96 g/cm³) have very different densities. Always calculate and weigh alloys by mass, never by cup or visual proportion.
Zinc vaporizes and oxidizes rapidly. Add under charcoal flux in a controlled melt, or use pre-compounded master alloy for consistent results.
Custom alloy mixing lets jewelers control color, hardness, and melt point for casting and fabrication. Enter target karat or composition and this calculator determines the weights of pure metal and alloying elements needed.