Injection Molding worked example

Molded Part Cost with material cost per part of 0.05 $/part: a worked example

This worked example runs the molded part cost numbers for a tougher week than the baseline: material cost per part of 0.05 $/part instead of the typical 0.1 $/part. Calculate total molded part cost by combining material cost, machine conversion cost, and amortized tooling per part.

The inputs for this scenario

  • Material cost per part: 0.05 $/part (the input this scenario stresses; the baseline uses 0.1)
  • Machine/conversion cost per part: 0.04 $/part (held at the documented default)
  • Amortized tooling cost per part: 0.02 $/part (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Total part cost = Material + Conversion + Tooling (per part).
  • Total works out to 0.11 $ at these inputs, and this is the headline figure for the scenario.
  • Element 1 works out to 0.05 $ at these inputs.
  • Element 2 works out to 0.04 $ at these inputs.
  • Element 3 + 4 works out to 0.02 $ at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where material cost per part sits at 0.1 $/part and the headline result is 0.15 $, this scenario comes in 29.22% below the baseline at 0.11 $.
  • Use it when quoting a new program or auditing an existing part to see which cost bucket dominates before adding margin. A result at this level usually justifies acting on the stressed input before touching anything else, because every other figure in the table is downstream of it.

Results at a glance

  • Total: 0.11 $ (headline result)
  • Element 1: 0.05 $
  • Element 2: 0.04 $
  • Element 3 + 4: 0.02 $

Run it with your numbers

  • To rerun this with your own numbers, open the live Molded Part Cost calculator, set material cost per part to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.