Coatings, Inks & Specialty Chemical Production worked example

Retained Sample Inventory with retained samples created per day of 21 samples / day: a worked example

Here is what the math looks like when conditions slip. We hold every other input steady and drop retained samples created per day to 21 samples / day, then walk the calculation through step by step. Estimate retained sample inventory from daily retained-sample creation, required retention period, and safety stock for disputes or retesting.

The inputs for this scenario

  • Retained samples created per day: 21 samples / day (the input this scenario stresses; the baseline uses 42)
  • Required retention period: 180 days (held at the documented default)
  • Retain safety stock: 250 samples (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Retention demand = retained samples created per day × required retention period.
  • Protected days of supply works out to 0 days at these inputs, and this is the headline figure for the scenario.
  • Unprotected days works out to 0.12 days at these inputs.
  • Inventory works out to 21 pieces at these inputs.
  • Daily usage works out to 180 pieces / day at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where retained samples created per day sits at 42 samples / day and the headline result is 0 days, this scenario comes in 50% below the baseline at 0 days.
  • The practical read: the gap between this scenario and the baseline is entirely attributable to retained samples created per day, so recovering it is worth quantifying in dollars before considering equipment or staffing changes. It assumes a steady daily retain rate and a single uniform retention period; products with longer regulatory holds or seasonal production surges need to be modeled separately.

Results at a glance

  • Protected days of supply: 0 days (headline result)
  • Unprotected days: 0.12 days
  • Inventory: 21 pieces
  • Daily usage: 180 pieces / day

Run it with your numbers

  • To rerun this with your own numbers, open the live Retained Sample Inventory calculator, set retained samples created per day to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.