Coatings, Inks & Specialty Chemical Production worked example

Batch Rework Cost at 110% share of the batch needing rework: a worked example

What does the result look like when share of the batch needing rework reaches 110%? The full calculation is worked below with real intermediate numbers. costing rework on a coating, ink, resin, or specialty chemical batch

The inputs for this scenario

  • Off-spec batch volume reworked: 620 gal (unchanged)
  • Rework processing cost per gallon: 3.8 $ / unit (unchanged)
  • Share of the batch needing rework: 110 % (raised for this scenario; the documented default is 100)
  • Lab retest, downtime, and disposal adders: 480 $ (unchanged)

Working through the calculation

  • Applying the documented formula (Variable batch rework cost = reworked batch quantity × rework cost per unit × affected batch share) to the inputs above produces each figure below.
  • At this operating point the engine returns 3,072 $ for total batch rework cost, the number this scenario is built around.
  • At this operating point the engine returns 4.95 $ / piece for batch rework cost per sellable unit.
  • At this operating point the engine returns 2,592 $ for variable batch rework cost.
  • At this operating point the engine returns 480 $ for lab, downtime, and disposal adders.

How this compares with the baseline

  • Against the tool's baseline example, where share of the batch needing rework sits at 100% and the headline result is 2,836 $, this scenario comes in 8.31% above the baseline at 3,072 $.
  • A figure at this level is achievable when share of the batch needing rework is genuinely sustained, not just peaked for a shift. It assumes a single rework pass at a flat per-gallon rate; multi-cycle rework, scrapped portions sold below cost, or scheduling disruption to downstream orders are not captured beyond the fixed adder.

Results at a glance

  • total batch rework cost: 3,072 $ (headline result)
  • batch rework cost per sellable unit: 4.95 $ / piece
  • variable batch rework cost: 2,592 $
  • lab, downtime, and disposal adders: 480 $

Run it with your numbers

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

Last reviewed 2026-05-12.