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Calcimator

Clay Volume Calculator

Estimate clay weight and volume needed for a sculpture based on dimensions, clay type, and construction method.

Inputs

Results

Clay needed (lbs)

42.3

Clay needed (kg)19.2
Clay volume (in³)547
25-lb bags needed2
50-lb bags needed1
Estimated clay cost$23.26
Shrinkage (%)10
Fired height (in)16.2
Fired width (in)9
Sculpture volume (in³)547
How to Use This Calculator
  1. Enter the sculpture's bounding box dimensions: height, width, and depth in inches.
  2. Select clay type (water-based, oil-based/plasteline, polymer, or air-dry).
  3. Set construction method (solid, hollow, or armature-supported) to adjust fill factor.
  4. Review clay weight in lbs and kg, clay volume in cubic inches, and number of 25-lb bags.
  5. Order 10-15% extra clay to account for waste, armature voids, and surface reworking.

How the result changes with Sculpture height (in)

Sculpture height (in)Clay needed (lbs)
1330.5
43101
78183.2
108253.7

What each input means

Sculpture height (in)
Overall height of the finished sculpture in inches.
Sculpture width (in)
Maximum width of the sculpture.
Sculpture depth (in)
Maximum depth (front to back).
Clay type
0 = earthenware, 1 = stoneware, 2 = porcelain, 3 = oil-based (Chavant/Roma).
Construction
0 = solid (for small pieces or maquettes), 1 = hollow (coil/slab built for firing).
Wall thickness (in)
Wall thickness for hollow construction. Ignored for solid pieces.

What each result means

Clay needed (lbs)
Total clay weight including 12% waste allowance.
Clay needed (kg)
Clay weight in kilograms.
Clay volume (in³)
Volume of clay in the sculpture.
25-lb bags needed
Number of standard 25-lb bags to purchase.
50-lb bags needed
Number of 50-lb bags to purchase.
Estimated clay cost
Approximate cost based on clay type.
Shrinkage (%)
Total volumetric shrinkage from wet to fired.
Fired height (in)
Expected height after firing (accounting for shrinkage).
Fired width (in)
Expected width after firing.
Sculpture volume (in³)
Estimated total sculpture volume (before hollowing).

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Sculpture height (in) = 18, Sculpture width (in) = 10, Sculpture depth (in) = 8, Clay type = 1 = 6 input(s) provided
  2. Calculate Clay needed
    Clay needed = clayWeightLbs * wasteFactor
    42.3 = 42.3
  3. Calculate Clay volume
    Clay volume
    547 = 547

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