Coatings, Inks & Specialty Chemical Production worked example

Batch Rework Cost at 72% share of the batch needing rework: a worked example

This worked example runs the batch rework cost numbers for a tougher week than the baseline: 72% share of the batch needing rework instead of the typical 100%. Estimate batch rework cost from reworked quantity, rework cost per unit, affected share, and fixed lab or production adders.

The inputs for this scenario

  • Off-spec batch volume reworked: 620 gal (held at the documented default)
  • Rework processing cost per gallon: 3.8 $ / unit (held at the documented default)
  • Share of the batch needing rework: 72 % (the input this scenario stresses; the baseline uses 100)
  • Lab retest, downtime, and disposal adders: 480 $ (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Variable batch rework cost = reworked batch quantity × rework cost per unit × affected batch share.
  • total batch rework cost works out to 2,176 $ at these inputs, and this is the headline figure for the scenario.
  • batch rework cost per sellable unit works out to 3.51 $ / piece at these inputs.
  • variable batch rework cost works out to 1,696 $ at these inputs.
  • lab, downtime, and disposal adders works out to 480 $ at these inputs.

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 23.26% below the baseline at 2,176 $.
  • Use it after a batch fails QC and is re-blended, or when building a case that a recurring color or viscosity defect justifies equipment or process investment. 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 batch rework cost: 2,176 $ (headline result)
  • batch rework cost per sellable unit: 3.51 $ / piece
  • variable batch rework cost: 1,696 $
  • lab, downtime, and disposal adders: 480 $

Run it with your numbers

  • To rerun this with your own numbers, open the live Batch Rework Cost calculator, set share of the batch needing rework to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.