Tools/Glaze Batch Calculator
Glaze Batch Calculator
Enter your recipe percentages and a target batch size. Get exact weights for every material, with colorants handled separately on top of the 100% base.
Added on top of the 100% base — e.g. 2% cobalt carbonate on a 1000g batch = 20g extra.
How do I calculate a glaze batch size?
Glaze recipes are written in percentages so they can be scaled to any batch size. To calculate the actual weight of each material, multiply its percentage by your target batch size and divide by 100. For a 1000g batch of a recipe that's 50% feldspar, 25% silica, 15% whiting, and 10% kaolin, you'd weigh out 500g, 250g, 150g, and 100g respectively.
Why are colorants added on top of the 100% base?
Keeping colorants and opacifiers outside the 100% base lets you adjust them without changing the glaze chemistry underneath. A base recipe at 2% cobalt carbonate versus 4% cobalt carbonate still fires the same way structurally — only the color shifts. This is why most potter's recipes list colorants as additions rather than reformulating the base.
How do I scale a glaze recipe up or down?
Just change the target batch size. Because the recipe is percentage-based, all the individual weights scale proportionally. A common studio workflow is to test new glazes at 500g, then mix production batches at 2000–5000g once a recipe is dialed in.