Clay Shrinkage Calculator

Find fired size from wet clay dimensions.

Fired dimension 17.6

Amount lost 2.4

Formula: fired = wet × (1 − shrinkage/100)

Step-by-step with your numbers:

1. Values used:

2. Wet dimension = 20

3. Shrinkage rate = 12 %

5. Fired dimension = 17.6

6. Amount lost = (20 / 100) x 12 = 0.2 x 12 = 2.4

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Clay shrinks as it dries and fires.

The math behind it

fired size = wet size × (1 − shrinkage % ÷ 100).

20 cm wet, 12% shrinkage → 17.6 cm.

Keen potter?

Make a shrinkage ruler or test tile for your exact clay.