Blow Molding & Hollow Plastic Products worked example

Mold Changeover Cost at 110% changeover cost allocation share: a worked example in blow molding & hollow plastic products

What does the result look like when changeover cost allocation share reaches 110%? The full calculation is worked below with real intermediate numbers. a blow molding operation needs to cost a mold change for bottles, containers, drums, reservoirs, or hollow parts

The inputs for this scenario

  • Mold changeover hours: 4.5 hours (unchanged)
  • Blended changeover cost rate: 185 $ / hour (unchanged)
  • Changeover cost allocation share: 110 % (raised for this scenario; the documented default is 100)
  • Fixed startup and tooling cost: 650 $ (unchanged)

Working through the calculation

  • Applying the documented formula (Allocated variable changeover cost = mold changeover hours × blended changeover cost rate × changeover cost allocation share) to the inputs above produces each figure below.
  • At this operating point the engine returns 1,566 $ for total mold changeover cost, the number this scenario is built around.
  • At this operating point the engine returns 348 $ / hr for blended changeover cost rate.
  • At this operating point the engine returns 916 $ for allocated variable changeover cost.
  • At this operating point the engine returns 650 $ for fixed startup and tooling cost.

How this compares with the baseline

  • Against the tool's baseline example, where changeover cost allocation share sits at 100% and the headline result is 1,483 $, this scenario comes in 5.62% above the baseline at 1,566 $.
  • A figure at this level is achievable when changeover cost allocation share is genuinely sustained, not just peaked for a shift. It assumes a single blended hourly rate and a flat allocation share; it does not model learning-curve scrap that tapers as the run stabilizes.

Results at a glance

  • Total mold changeover cost: 1,566 $ (headline result)
  • Blended changeover cost rate: 348 $ / hr
  • Allocated variable changeover cost: 916 $
  • Fixed startup and tooling cost: 650 $

Run it with your numbers

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

Last reviewed 2026-05-12.