Office, School & Institutional Products worked example

Plastic Component Cost at 70% parts passing dimensional qc: a worked example

This worked example runs the plastic component cost numbers for a tougher week than the baseline: 70% parts passing dimensional qc instead of the typical 97%. Estimates plastic component cost from the molded part count, resin and cycle cost per part, the share passing dimensional QC, and a flat mold-setup charge.

The inputs for this scenario

  • Molded parts in the production lot: 5,000 parts (held at the documented default)
  • Resin & cycle cost per part: 0.85 $/part (held at the documented default)
  • Parts passing dimensional QC: 70 % (the input this scenario stresses; the baseline uses 97)
  • Mold setup & first-article: 180 $ (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Total plastic component cost = parts in lot x cost per part x QC pass rate + mold setup.
  • Total plastic component cost works out to 3,155 $ at these inputs, and this is the headline figure for the scenario.
  • Plastic component cost per unit works out to 0.63 $ / piece at these inputs.
  • Variable plastic component cost works out to 2,975 $ at these inputs.
  • Fixed plastic component cost adder works out to 180 $ at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where parts passing dimensional qc sits at 97% and the headline result is 4,303 $, this scenario comes in 26.67% below the baseline at 3,155 $.
  • Use it when quoting or reviewing an injection-molding run and you need the effect of scrap and one-time tooling baked into a per-part number. 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 plastic component cost: 3,155 $ (headline result)
  • Plastic component cost per unit: 0.63 $ / piece
  • Variable plastic component cost: 2,975 $
  • Fixed plastic component cost adder: 180 $

Run it with your numbers

  • To rerun this with your own numbers, open the live Plastic Component Cost calculator, set parts passing dimensional qc to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.