Industrial Cybersecurity & OT Risk worked example

OT Asset Inventory Coverage at 71% target asset inventory coverage: a worked example

Here is what the math looks like when conditions slip. We hold every other input steady and drop target asset inventory coverage to 71%, then walk the calculation through step by step. Calculate OT asset inventory coverage using discovered assets, expected assets, and target coverage.

The inputs for this scenario

  • OT assets inventoried: 820 assets (held at the documented default)
  • Expected OT assets in scope: 930 assets (held at the documented default)
  • Target asset inventory coverage: 71 % (the input this scenario stresses; the baseline uses 98)

Working through the calculation

  • The calculation starts from the formula this tool documents: OT asset inventory coverage = OT assets inventoried ÷ expected OT assets in scope × 100.
  • OT asset inventory coverage works out to 88.17 % at these inputs, and this is the headline figure for the scenario.
  • OT asset inventory coverage gap to target works out to -17.17 points at these inputs.
  • OT assets inventoried works out to 820 count at these inputs.
  • Expected OT assets in scope works out to 930 count at these inputs.

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 %.
  • The practical read: the gap between this scenario and the baseline is entirely attributable to target asset inventory coverage, so recovering it is worth quantifying in dollars before considering equipment or staffing changes. 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: -17.17 points
  • OT assets inventoried: 820 count
  • Expected OT assets in scope: 930 count

Run it with your numbers

  • To rerun this with your own numbers, open the live OT Asset Inventory Coverage calculator, set target asset inventory coverage to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.