Glaze Recipe Calculator

The calculator computes a fifth 'filler' percentage equal to whatever shortfall remains below 100%, and gives it its own gram weight so the total batch always accounts for the full weight you entered. It's a bookkeeping category, not a real ingredient recommendation, so a large filler weight usually means you mistyped a percentage rather than that you actually need an unspecified filler material.

Those three categories are the core structural components of most glazes: silica is the glass former that actually vitrifies into the glassy coating, alumina stiffens the melt so it doesn't run off vertical surfaces during firing, and flux (feldspar, whiting, and similar materials) lowers the melting point so the glaze matures at your kiln's firing temperature instead of remaining unmelted or underfired.

No — it only converts percentages you supply into gram weights for a given batch size; it doesn't compute a Unity Molecular Formula or check whether your silica-to-alumina-to-flux ratio will actually produce a stable, well-fitted glaze at your target cone. Use a UMF calculator or a tested published recipe for formulation, and use this tool once you already know the percentages you want to mix.

The calculator accepts 0–20% colorant, but most oxide colorants (cobalt, iron, copper, etc.) are potent enough that 1–3% produces a noticeable tint, 3–6% gives a strong, saturated color, and pushing much past 10% risks a glaze that's overloaded with metal oxide rather than more vivid — the right amount is highly specific to which oxide you're using, so test small batches before scaling up.