MANUFACTURING – INJECTION MOULDING & PLATIC CALCULATOR
Shot Weight
A precise tool.
What is the Shot Weight & How does it work?
Shot weight is the total mass of material that must be injected into a mold to produce a single part.
It is calculated by multiplying the part’s geometric volume by the density of the selected polymer.
Accurate shot weight estimation helps optimise machine settings, reduce cycle time, and minimise material waste.
W = V \times \rho
W = shot weight (g)
Parameters
Result
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Frequently Asked Questions
How do I calculate shot weight?
Multiply the part’s geometric volume by the density of the selected polymer to get the shot weight in grams.
Why is accurate shot weight important?
Accurate shot weight helps optimize machine settings, reduce cycle time, and minimize material waste in injection molding.
What units are used for shot weight?
Shot weight is typically measured in grams (g).
How does density affect shot weight?
Density directly affects shot weight; a higher density polymer will result in a heavier shot weight for the same volume.
Can I use this calculator for all types of polymers?
This calculator is generally applicable to most thermoplastic polymers, but specific densities may vary. Always check the material data sheet for accuracy.
What if my part has multiple materials?
For parts with multiple materials, calculate the shot weight for each component separately using its respective density and then sum them up.
How do I measure the geometric volume of my part?
Measure the dimensions of your part and use the appropriate geometric formula (e.g., length x width x height for a rectangular prism) to calculate the volume.
Results are for informational purposes only and do not constitute professional advice.