Ammunition Components & Ballistics Manufacturing worked example

Ammunition Component Inventory Coverage with cases, primers, or loaded rounds in stock of 600,000 units: a worked example

What does the result look like when cases, primers, or loaded rounds in stock reaches 600,000 units? The full calculation is worked below with real intermediate numbers. an inventory planner needs to estimate days of supply for a component, packaging item, or finished-goods lot

The inputs for this scenario

  • Cases, primers, or loaded rounds in stock: 600,000 units (raised for this scenario; the documented default is 240,000)
  • Average daily consumption or shipments: 18,000 units/day (unchanged)
  • Safety-stock haircut factor: 0.85 x (unchanged)

Working through the calculation

  • Applying the documented formula (Unprotected inventory days = inventory on hand รท average daily usage or demand) to the inputs above produces each figure below.
  • At this operating point the engine returns 39.22 protected days for protected inventory days of supply, the number this scenario is built around.
  • At this operating point the engine returns 33.33 days for unprotected inventory days.
  • At this operating point the engine returns 600,000 units for inventory on hand.
  • At this operating point the engine returns 18,000 units/day for average daily usage or demand.

How this compares with the baseline

  • Against the tool's baseline example, where cases, primers, or loaded rounds in stock sits at 240,000 units and the headline result is 15.69 protected days, this scenario comes in 150% above the baseline at 39.22 protected days.
  • A figure at this level is achievable when cases, primers, or loaded rounds in stock is genuinely sustained, not just peaked for a shift. It uses a single average daily usage, so it understates risk when demand is spiky or when one caliber surges, and it does not model supplier lead-time variability directly.

Results at a glance

  • Protected inventory days of supply: 39.22 protected days (headline result)
  • Unprotected inventory days: 33.33 days
  • Inventory on hand: 600,000 units
  • Average daily usage or demand: 18,000 units/day

Run it with your numbers

  • Every input above is editable in the live Ammunition Component Inventory Coverage calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.