Clay & Shrinkage

Multi-Axis Shrinkage Calculator

Measure shrinkage in X, Y, and Z axes to detect anisotropic behavior and warping risk.

Updated

Wet Measurements

mm
mm

Fired Measurements

mm
mm

Wet Z (Thickness)

mm

Fired Z (Thickness)

mm

Z axis detects anisotropic shrinkage (thickness vs. width/length). Useful for tiles and slab work.

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Results

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Enter your measurements above and click Calculate.

Understanding Anisotropic Shrinkage

When clay shrinks differently in different directions, it is called anisotropic. This happens because clay platelets align during forming — along the direction of rolling, throwing, or extrusion — causing the clay to shrink more in that direction than perpendicular to it.

For tiles and slabs, a difference greater than 2% between X and Y axes will result in visible warping. The piece pulls itself into a curved or twisted shape as it fires. This is why cross-rolling (rotating the slab 90° between each pass of the rolling pin) is a critical technique for flat work.

Formula

Shrinkage X = ((wet_X − fired_X) / wet_X) × 100

The axis difference metric shows the absolute percentage difference between X and Y shrinkage. Keep this below 1.5% for reliable, warp-free work.

Frequently Asked Questions

What is anisotropic shrinkage? expand_more
Anisotropic shrinkage means the clay shrinks at different rates in different directions. This is caused by clay particle alignment from rolling, throwing, or extrusion, and results in warping of flat pieces.
How do I fix warping tiles? expand_more
Fire tiles on a flat kiln shelf with kiln wash. Slow your firing ramp through the quartz inversion (500–600°C). Try cross-rolling slabs (rotate 90° between rolls) to reduce particle alignment.