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Calcimator

Wax Pattern Weight Calculator

Calculate the casting alloy weight needed from wax pattern weight using wax and alloy densities.

Inputs

oz
g/cc
g/cc
mm
mm

Results

Alloy per Pattern

15.66 g

Total Alloy Needed

19.38 g

Wax Volume1.26 cc
Sprue Weight0.49 g
Total per Pattern16.15 g
All Patterns Weight16.15 g
Button Reserve (20%)3.23 g
Estimated Material Cost$484.50
How to Use This Calculator
  1. Weigh the wax pattern on a lab scale and enter the Wax Pattern Weight (g).
  2. Enter the Wax Density (typically 0.9-1.0 g/cc) and the Alloy Density for your casting metal.
  3. Enter the Sprue Length and Sprue Diameter to include the sprue channel weight.
  4. Set the number of Patterns on Tree if casting multiple units.
  5. Read off Alloy per Pattern, Button Reserve, and Total Alloy Needed (g) to prepare the crucible charge.

How the result changes with Wax Density

Wax DensityAlloy per PatternTotal Alloy Needed
0.624.8 g30.34 g
0.8517.51 g21.59 g
1.1512.94 g16.11 g
1.410.63 g13.34 g

What each input means

Wax Pattern Weight
Weight of the wax pattern on a lab scale.
Wax Density
Density of the pattern wax (typically 0.9-1.0 g/cc).
Alloy Density
Density of casting alloy (gold ~19.3, Pd-Ag ~11, base metal ~8).
Sprue Length
Length of the sprue channel.
Sprue Diameter
Diameter of the sprue former.
Patterns on Tree
Number of wax patterns sprued to the casting tree.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Wax Pattern Weight = 1.2, Wax Density = 0.95, Alloy Density = 12.4, Sprue Length = 8 = 6 input(s) provided
  2. Calculate Alloy per Pattern
    Alloy per Pattern
    15.66 = 15.66
  3. Calculate Total Alloy Needed
    Total Alloy Needed
    19.38 = 19.38
  4. Calculate Wax Volume
    Wax Volume
    1.263 = 1.263
  5. Calculate Sprue Weight
    Sprue Weight
    0.49 = 0.49

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