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Network Risk Score Calculator

Quantify network risk from single points of failure, unsupported hardware, unpatched devices, monitoring gaps and change volume.

About Network Risk Score Calculator

Each dimension is normalised against fleet size so the score is comparable between a 40-device and a 4000-device estate. Unlike a health score, higher is worse here, and the highest-weighted component names the remediation that buys the most risk reduction per unit of effort. Risk registers full of adjectives do not get funded; a weighted score with a named top contributor turns 'we should replace those switches' into a prioritised plan.

Formula

Network Risk Score

risk = SPOF density (25) + end-of-support share (25) + patch gap (20) + monitoring gap (15) + change failure rate (15).

SPOF density
Single points of failure relative to fleet size
change failure rate
Failed changes per year, scored against a 50-per-year reference

Worked example

With the default values below, Network Risk Score Calculator returns Risk Score of 36.1. Change any input above and every figure here is recalculated in your browser.

Inputs used

Devices in scopeaccepts 1–1,000,000 devices
400 devices
Single points of failureaccepts 0–10,000 SPOFs
7 SPOFs
Devices past end of supportaccepts 0–1,000,000 devices
45 devices
Devices behind on patchesaccepts 0–1,000,000 devices
90 devices
Devices under monitoringaccepts 0–100 %
88 %
Changes per monthaccepts 0–100,000 changes
60 changes
Changes that fail or need rollbackaccepts 0–100 %
6 %

Results

Risk Score
36.1 /100
Risk Level
Low
Share of Fleet Past End of Support
11.3%
Share of Fleet Behind on Patches
22.5%
Failed Changes Expected per Year
43.2
Highest-Weighted Risk
Single points of failure

Step by step

  1. 1Values used
  2. 2Network Risk Score
  3. 3Risk Score= 36.1 /100
  4. 4Risk Level= Low
  5. 5Share of Fleet Past End of Support= 11.3
  6. 6Share of Fleet Behind on Patches= 22.5
  7. 7Failed Changes Expected per Year= 43.2
  8. 8Highest-Weighted Risk= Single points of failure

Assumptions and limits

  • The result is derived only from the 7 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 1 decimal place, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How is Network Risk Score calculated?

risk = SPOF density (25) + end-of-support share (25) + patch gap (20) + monitoring gap (15) + change failure rate (15). Each dimension is normalised against fleet size so the score is comparable between a 40-device and a 4000-device estate. Unlike a health score, higher is worse here, and the highest-weighted component names the remediation that buys the most risk reduction per unit of effort.

Why does Network Risk Score matter?

Risk registers full of adjectives do not get funded; a weighted score with a named top contributor turns 'we should replace those switches' into a prioritised plan.

What values do I need to enter?

This calculator takes 7 inputs: Devices in scope, Single points of failure, Devices past end of support, Devices behind on patches, Devices under monitoring, Changes per month, Changes that fail or need rollback. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.

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