Ceramics & pottery calculators

Use a weighed glaze sample to estimate how much dry base is in a wet bucket, then find the dry additive weight for your chosen percentage. Choose a Brongniart estimate when the base density is known, or a dried sample when you can measure the residue directly.

Use a weighed, measured slip sample to estimate its dry-solids content and the dry material and water in the whole batch. The calculator also works backward from a target solids percentage to show a one-direction correction.

Enter the three masses from a fired ceramic absorption test. The calculator returns water absorption, apparent porosity, dry bulk density, apparent specific gravity, and the two volume terms used in the calculation.

Enter the two measured stock glaze batches and the percentage range you want to test. The calculator returns a cup-by-cup blend table, reserve-adjusted stock needs, and a check against the stock volume you prepared.

Enter a weighed glaze batch, or use two hydrometer readings and a weighed water addition when the bucket cannot be lifted. The calculator estimates solids, water, the signed water adjustment, and a dry-glaze alternative when raising specific gravity.

Enter the measured wet, bone-dry, bisque-fired, and final-fired gauge lengths from a clay test bar. The calculator returns each shrinkage stage and the wet making size needed for a chosen fired dimension.

Enter one timed test cast, the stage where you measured it, and the shrinkage for your clay body. The calculator returns the drain time and timing window needed to hit a fired wall thickness.

Select a cone to build a guide-target-guard pack, or start with a temperature to find the nearest published Orton cone. The result uses the cone form and the heating rate during the final part of the firing.