Fired Size
6.99 in
Total Shrink
12.6%
Scale Factor
1.144x
Estimated Fired Dimension
6.99
inches
Wet Size
8.00 in
Fired Size
6.99 in
Total Shrinkage
12.6%
Scale-Up Factor
1.144x
Inputs
Result
This is the kind of scale difference that matters for tiles, lids, and fitted forms.
Inputs
Result
Scaling up from a target fired dimension lets you build the wet piece to the right height so the finished mug hits 5 inches after kiln firing.
Total shrinkage combines drying shrinkage and firing shrinkage multiplicatively, not by simple addition. A clay body with 6% drying shrinkage and 7% firing shrinkage shrinks by about 12.6% overall.
The most common reason is underestimating total shrinkage. Clay bodies, moisture content, and firing temperature all affect the final result, so a small percentage error can noticeably change the finished dimension.
Most stoneware clays shrink 10% to 14% total from wet to fired, while porcelain can reach 12% to 16%. Earthenware fired at lower temperatures often shrinks less, around 5% to 8% total.
The standard method uses test bars or tiles marked with a ruler line at a known wet length. After drying and firing, measure the same line to calculate the percentage change at each stage.
Explore glaze, kiln, mold, and material calculators for ceramic work.
Last Updated: Mar 11, 2026
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