Industrial Cybersecurity & OT Risk worked example

Patch Compliance Rate at 65% target patch compliance: a worked example

Suppose target patch compliance falls to 65%. This page works the full calculation at that level so you can see exactly which result moves and by how much. Calculate OT patch compliance using patched assets, eligible assets, and target patch compliance.

The inputs for this scenario

  • OT assets patched to approved baseline: 112 assets (held at the documented default)
  • Total OT assets eligible for patching: 150 assets (held at the documented default)
  • Target patch compliance: 65 % (the input this scenario stresses; the baseline uses 90)

Working through the calculation

  • The calculation starts from the formula this tool documents: Patch compliance rate = OT assets patched to approved baseline ÷ total OT assets eligible for patching × 100.
  • OT patch compliance rate works out to 74.67 % at these inputs, and this is the headline figure for the scenario.
  • Patch compliance gap to target works out to -9.67 points at these inputs.
  • OT assets patched to approved baseline works out to 112 count at these inputs.
  • Total OT assets eligible for patching works out to 150 count at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where target patch compliance sits at 90% and the headline result is 74.67 %, this scenario lands almost exactly on the baseline at 74.67 %.
  • It computes the percentage of eligible OT assets patched to the approved baseline and the point gap between that rate and your target. When the numbers land here, the stressed input is the lever to work; the walkthrough above shows exactly how much each output recovers as it climbs back toward the baseline.

Results at a glance

  • OT patch compliance rate: 74.67 % (headline result)
  • Patch compliance gap to target: -9.67 points
  • OT assets patched to approved baseline: 112 count
  • Total OT assets eligible for patching: 150 count

Run it with your numbers

  • To rerun this with your own numbers, open the live Patch Compliance Rate calculator, set target patch compliance to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.