Industrial Cybersecurity & OT Risk worked example

OT Asset Inventory Coverage at 99% target asset inventory coverage: a worked example

What does the result look like when target asset inventory coverage reaches 99%? The full calculation is worked below with real intermediate numbers. Use it when measuring asset visibility for PLCs, HMIs, SCADA nodes, network devices, servers, and engineering workstations.

The inputs for this scenario

  • OT assets inventoried: 820 assets (unchanged)
  • Expected OT assets in scope: 930 assets (unchanged)
  • Target asset inventory coverage: 99 % (raised for this scenario; the documented default is 98)

Working through the calculation

  • Applying the documented formula (OT asset inventory coverage = OT assets inventoried ÷ expected OT assets in scope × 100) to the inputs above produces each figure below.
  • At this operating point the engine returns 88.17 % for ot asset inventory coverage, the number this scenario is built around.
  • At this operating point the engine returns 10.83 points for ot asset inventory coverage gap to target.
  • At this operating point the engine returns 820 count for ot assets inventoried.
  • At this operating point the engine returns 930 count for expected ot assets in scope.

How this compares with the baseline

  • Against the tool's baseline example, where target asset inventory coverage sits at 98% and the headline result is 88.17 %, this scenario lands almost exactly on the baseline at 88.17 %.
  • A figure at this level is achievable when target asset inventory coverage is genuinely sustained, not just peaked for a shift. It depends entirely on a credible 'expected assets in scope' figure — if that denominator is wrong, your coverage percentage is misleading even at 100%.

Results at a glance

  • OT asset inventory coverage: 88.17 % (headline result)
  • OT asset inventory coverage gap to target: 10.83 points
  • OT assets inventoried: 820 count
  • Expected OT assets in scope: 930 count

Run it with your numbers

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

Last reviewed 2026-05-12.