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Clay shrinks both in drying and firing. How much? About 6% from wet to bone dry. Then about 6% more from bone dry to a final firing at cone 10. That’s 12% on average! But of course it varies from about 10% to 14%, depending on your clay body and how it was thrown or rolled out. Because of this, many potters create their pottery bigger than how they really want it to be so that it will be a certain size in the end. But, how much bigger though? With the help of the Shrunk Ruler, you do not need much experience to figure it out! The shrink ruler guides you in planning for shrinking when creating your wares. Get the results you want easier and effortlessly with this tool.