Print a test card
Record wet, bone-dry, and fired lengths from your own test bar, along with clay and firing details.
Open printable card →The pottery studio
Know your clay.
Make with confidence.
A small collection for measuring shrinkage, planning dimensions, and recording what happens between the workbench and the kiln.
Use the shrinkage calculatorA simple studio workflow
Plan the starting size
Use measured wet-to-fired shrinkage or a known rate to work backwards from the finished dimensions you want.
Open clay calculator →Keep a clay test log
Compare drying, firing, and total shrinkage across your own tests. Save locally and export a CSV copy.
Open test log →Read the studio guides
Get the measurement method right and avoid mixing up percentages with different starting lengths.
Browse clay guides →Start with the essentials
Calculator examples are illustrative, not a substitute for testing your own clay body and firing conditions.