Network Risk Score Calculator
Quantify network risk from single points of failure, unsupported hardware, unpatched devices, monitoring gaps and change volume.
Inputs
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
Values used
Devices in scope = 400 devices; Single points of failure = 7 SPOFs; Devices past end of support = 45 devices; Devices behind on patches = 90 devices; Devices under monitoring = 88 %; Changes per month = 60 changes; Changes that fail or need rollback = 6 %
Network Risk Score
risk = SPOF density (25) + end-of-support share (25) + patch gap (20) + monitoring gap (15) + change failure rate (15).
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
How it works
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
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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