Building Materials Manufacturing worked example

Aggregate Stockpile Days with usable aggregate in stockpile of 31,300 tons: a worked example

This scenario runs the aggregate stockpile days calculation on the strong side: usable aggregate in stockpile of 31,300 tons, with every other input held at its documented default. a plant needs to know how many days its aggregate stockpile can support planned production

The inputs for this scenario

  • Usable aggregate in stockpile: 31,300 tons (raised for this scenario; the documented default is 12,500)
  • Average daily aggregate demand: 850 tons / day (unchanged)
  • Safety stock multiplier for weather and delivery risk: 1.2 x (unchanged)

Working through the calculation

  • Applying the documented formula (Unprotected days = usable inventory รท daily demand) to the inputs above produces each figure below.
  • At this operating point the engine returns 30.69 protected days for aggregate stockpile days, the number this scenario is built around.
  • At this operating point the engine returns 36.82 days for unprotected aggregate stockpile days.
  • At this operating point the engine returns 31,300 pieces for usable aggregate in stockpile.
  • At this operating point the engine returns 850 pieces / day for average daily aggregate demand.

How this compares with the baseline

  • Against the tool's baseline example, where usable aggregate in stockpile sits at 12,500 tons and the headline result is 12.25 protected days, this scenario comes in 150% above the baseline at 30.69 protected days.
  • Use it when setting reorder points, planning supply through a high-risk season, or sizing stockpile capacity for a new plant. Treat this as a target state: the delta against the baseline quantifies what the improvement is worth before you commit to chasing it.

Results at a glance

  • Aggregate Stockpile Days: 30.69 protected days (headline result)
  • Unprotected aggregate stockpile days: 36.82 days
  • Usable aggregate in stockpile: 31,300 pieces
  • Average daily aggregate demand: 850 pieces / day

Run it with your numbers

  • Every input above is editable in the live Aggregate Stockpile Days calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.