Clay Shrinkage Calculator
Calculate clay shrinkage rates for accurate pottery sizing and planning your ceramic projects.
Professional Shrinkage Calculator
Project Specifications
Shrinkage Results
Wet Dimensions
Length × Width × Height:0" × 0" × 0"
Leather Hard (Dry)
Dimensions:0" × 0" × 0"
Volume Change:0%
After Firing
Final Dimensions:0" × 0" × 0"
Total Linear Shrinkage:0%
Total Volume Change:0%
Reverse Calculator
For desired final size, start with:
Initial Wet Size:0" × 0" × 0"
Scale Factor:1.00x
Thickness Guidelines
Wet Thickness:0.0"
Dry Thickness:0.0"
Fired Thickness:0.0"
Clay Shrinkage Reference
| Clay Type | Drying Shrinkage | Firing Shrinkage | Total Shrinkage | Typical Use |
|---|---|---|---|---|
| Earthenware | 5-7% | 4-6% | 9-13% | Decorative, low-fire |
| Stoneware | 6-8% | 8-12% | 14-20% | Functional pottery |
| Porcelain | 7-9% | 12-16% | 19-25% | Fine ceramics |
| Paper Clay | 8-10% | 8-12% | 16-22% | Sculptural work |
| Fire Clay | 4-6% | 6-8% | 10-14% | High-temp work |
Shrinkage Management Tips
Drying Phase
- • Dry slowly and evenly
- • Cover with plastic to control drying
- • Turn pieces regularly
- • Avoid drafts and direct heat
- • Support large pieces properly
- • Monitor for cracking
Firing Phase
- • Fire slowly through critical ranges
- • Ensure proper kiln ventilation
- • Support pieces to prevent warping
- • Use appropriate stilts and props
- • Monitor kiln temperature carefully
- • Cool gradually to prevent thermal shock
Planning Tips
- • Test new clay bodies for shrinkage
- • Keep detailed records
- • Make test tiles for each clay
- • Account for glaze expansion/contraction
- • Plan for seasonal variations
- • Create shrinkage rulers