Shrinkage Calculators
These are simple, beginner‑friendly tools.
Designed to give you a quick estimate when planning your projects. Please use it as a
helpful guide not a replacement for testing your own clay, tools, and firing
methods. Every design, brand of clay and firing environment behaves slightly
differently, so your own results will always be the most reliable.
Leather Hard Shrinkage Calculator
This calculator uses your leather-hard measurements and applies your chosen shrinkage rate to estimate the final fired size of your piece. By entering the diameters, the calculator works out what your piece will measure after firing, based on the shrinkage percentage of your specific clay brand. It’s designed to give you a realistic guide before firing, helping you adjust, check proportions and avoid costly sizing mistakes. Please remember: this is an estimation tool. Final results can still vary slightly depending on band width, clay volume, thickness, and firing method. Used alongside your own shrinkage test strip results, this becomes a powerful accuracy tool ✨
Post-fired dimensions
Length after firing:
-
Width after firing:
-
Depth after firing:
-
Shrinkage rate used:
-
These are the expected dimensions after firing based on the shrinkage rate entered.
Post fired shrinkage calculator
This calculator works in reverse. It uses your desired final fired size and your clay’s shrinkage rate to calculate what size your piece needs to be at the leather-hard stage.
By entering the finished dimensions the calculator increases the measurement according to your clay’s shrinkage percentage. This tells you what size to form your piece before firing in order to achieve your intended result.
Please remember: this is still an estimation tool. Slight variations can occur depending on band width, clay volume, thickness, and firing method.
When combined with your personal shrinkage test results, this becomes a reliable planning tool for precise, confident making ✨
Shrinkage rate
Desired post-fired dimensions
Required pre-fired dimensions
Length:
0
mm
Width:
0
mm
Depth/Thickness:
0
mm