Glaze Material Substitution Calculators

Glaze Material Substitutions

This page provides a set of calculators to help with calculating common material substitutions in glaze recipes.

Warning: These calculators are based on theoretical UMF analysis of the materials, and I have not verified them experimentally. Oxide analysis isn’t the only factor that determines how a material will behave in a glaze.

Each calculator allows for conversions between two material forms. Click “Switch” to toggle the conversion direction. Red cells indicate that a material should be subtracted from the recipe.

Wollastonite / Whiting

Wollastonite (g)
Whiting (g)
Silica (g)

Copper Carbonate / Black Copper Oxide

Copper carbonate (g)
Black copper oxide (g)

Cobalt Carbonate / Cobalt Oxide

Cobalt carbonate (g)
Cobalt oxide (g)

Bone Ash / Dicalcium Phosphate

Bone Ash (g)
Dicalcium Phosphate (g)
Whiting (g)