Shrink Ruler

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  • Regular price $17.45
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The photos show both sides of the same ruler. One side shows 6% and 10%, the other side shows 12% and 14%.

The Shrink Ruler is a flexible, two-sided plastic ruler that helps potters measure clay shrinkage. It's an indispensible tool for obtaining exact matches for projects such as lids for teapots.  It shows measurements for four shrinkage rates:  6%, 10%, 12% and 14%.

How to use the Shrink Ruler:

  1. Measure the dimension of the finished piece you want using a standard inch ruler.
  2. Using the side of the Shrink Ruler which shows the shrinkage rate of your clay, find the measurement of the wet clay that corresponds to the dimension of the finished piece in Step 1.
  3. Mark that dimension found in Step 2 on your wet clay piece, or form the wet clay piece to that dimension.
  4. After the clay piece is fired, it will shrink to the correct size.