Practical pottery measurements
Clay shrinkage tools for getting the fired size right.
Printable rulers and straightforward calculators for working with drying and firing shrinkage. No logins, no downloads—use them free in your browser.
Printable Clay Shrinkage Ruler Generator
Generate a full-scale straight or wrap ruler for your exact shrinkage rate. Download tiled PDF or continuous SVG.
Open tool →Clay Shrinkage Rate Calculator
Convert wet and fired measurements in either direction instantly.
Open tool →Pottery Size Before Firing
Calculate how large to throw or build pottery to reach your desired fired size.
Open tool →How to Measure Clay Shrinkage
Use a test bar to find your clay body's actual shrinkage rate.
Open tool →Clay Shrinkage Chart
Compare earthenware, stoneware, and porcelain starting estimates.
Open tool →
More tools for accurate pottery making
Lid & Gallery Fitting Calculator Plan wet lid, opening, and gallery dimensions for any shrinkage rate. Clay Test-Bar Calculator Measure drying, bisque, and total firing shrinkage from marked test bars. Multi-Axis Shrinkage Calculator Calculate different shrinkage rates along length, width, and height.