Office, School & Institutional Products worked example

Plastic Component Cost at 99% parts passing dimensional qc: a worked example

Push parts passing dimensional qc up to 99% and the picture changes. This example computes every intermediate figure at that operating point. A molding cost estimator uses it to price the injection-molded trim, brackets, and fittings going into office and institutional furniture or fixtures.

The inputs for this scenario

  • Molded parts in the production lot: 5,000 parts (unchanged)
  • Resin & cycle cost per part: 0.85 $/part (unchanged)
  • Parts passing dimensional QC: 99 % (raised for this scenario; the documented default is 97)
  • Mold setup & first-article: 180 $ (unchanged)

Working through the calculation

  • Applying the documented formula (Total plastic component cost = parts in lot x cost per part x QC pass rate + mold setup) to the inputs above produces each figure below.
  • At this operating point the engine returns 4,388 $ for total plastic component cost, the number this scenario is built around.
  • At this operating point the engine returns 0.88 $ / piece for plastic component cost per unit.
  • At this operating point the engine returns 4,208 $ for variable plastic component cost.
  • At this operating point the engine returns 180 $ for fixed plastic component cost adder.

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 1.98% above the baseline at 4,388 $.
  • It computes total molded-lot cost as lot size times per-part cost weighted by the QC pass rate, plus mold setup, then divides by lot size for cost per good part. The value of this scenario is the size of the gap it exposes: that gap, priced out over a year, is the budget you can justify spending to close it.

Results at a glance

  • Total plastic component cost: 4,388 $ (headline result)
  • Plastic component cost per unit: 0.88 $ / piece
  • Variable plastic component cost: 4,208 $
  • Fixed plastic component cost adder: 180 $

Run it with your numbers

  • Every input above is editable in the live Plastic Component Cost calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.