Glaze Recipe Calculator
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A glaze UMF expresses oxide ratios with silica and alumina normalized to unity. Each raw material contributes specific oxides based on its chemical analysis percentage.
UMF = moles of each oxide / moles of SiO₂ (unity basis)Each ingredient in the recipe contributes oxides proportional to its weight and analysis. The solver distributes batch weights so the combined oxides match the target UMF within tolerance.
Oxide from material = (weight × analysis%) / 100Once a 100 g or 1 kg test batch is balanced, scale all ingredient weights proportionally to your production batch size while maintaining the same oxide ratios.
Scaled weight = (target batch g / reference batch g) × ingredient weightUpdated: July 2026
A 500 g test batch of a cone 10 celadon is verified on tiles. Scale all feldspar, silica, whiting, and colorant weights by 10× to mix 5 kg for a kiln load of mugs.
New feldspar shipment shows 0.3% higher K₂O in analysis. Recalculate batch weights to hold the same UMF rather than mixing by the old recipe blindly.
A dipping glaze needs 10 liters at 45° Baumé. Calculate dry batch weight from specific gravity target, then scale ingredient amounts from the unity formula.
Always scale glaze batches by weight. Different materials have different bulk densities, so cup-for-cup scaling introduces significant chemistry errors.
Use fresh chemical analysis for each material lot. Stored feldspar and whiting can absorb moisture, shifting actual oxide contributions in the mixed batch.
Pottery glazes are formulated from raw materials that contribute oxides to a unity molecular formula (UMF). This calculator converts your target UMF and material analysis into weighed batch amounts so you can mix repeatable glaze recipes in the studio.