Pottery Shrinkage Scale Calculator

Work backwards from a target fired size to the wet size to throw, and forwards from a thrown size to what it will fire to.

Which direction are you working?

The key difference from the clay shrinkage calculator: this tool starts from the size the piece has to finish at.

Target fired length (the long side) mm

The finished size the piece has to be. Used by the first option.

Target fired width or height (the short side) mm

For a round form, enter the same figure as the length.

Wet length you are making mm

The size on the wheel or the bench, before drying and firing. Used by the second and third options.

Wet width or height mm

Measured fired length mm

Only used by the third option, to work out the shrinkage you actually got.

Total linear shrinkage from wet to fired %

Drying plus firing. Five to twelve percent is typical, and porcelain can be higher.

Wall thickness, measured fired mm

Used for the interior capacity of the target form.

Reset

Free calculator by Handcraft worked examples and methodology No account, nothing stored.