THE FEUTEX TOOLKIT

Pottery Test Bar and Target Size

Use wet, dry and fired test-bar measurements to size a new wet clay piece for a target fired length.

Crafts workspace● Runs in your browser

01 Your input

Wet test lengthmmDry test lengthmmFired test lengthmmTarget fired lengthmm

02 Your result

View or copy raw result data

Result data

Formula

Drying shrinkage = 100*(wet-dry)/wet; Dry-to-fired shrinkage = 100*(dry-fired)/dry; Required wet length = target*wet/fired

Sources and model references

Made for real tasks

Use wet, dry and fired test-bar measurements to size a new wet clay piece for a target fired length.
Compare an alternative set of measurements without uploading personal data.

Load the example in the workspace to reproduce these results. Display rounding does not change the underlying calculation.

Enter wet test length, dry test length, fired test length, and target fired length in the displayed units.
Calculate and use each labeled result for pottery test bar and target size. Compare the result with a measured sample before committing materials.

{
  "wet": 100,
  "dry": 95,
  "fired": 88,
  "target": 150
}

Use test bars from the same clay body and firing schedule. Assumes uniform linear shrinkage, which does not capture warping.

This tool runs locally in your browser. Input and output are not sent to a processing server. Copy or download your result before leaving the page.