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Network Security Score Calculator

Roll segmentation, firewall hygiene, inspection, DDoS, VPN, DNS and monitoring into one weighted network security score.

About Network Security Score Calculator

Segmentation and monitoring carry the heaviest weight because they respectively bound and reveal every incident — one limits how far an attacker gets, the other determines whether you find out. The highest-leverage domain is not simply the weakest one: it is where weight multiplied by the remaining gap is largest, which is where the next point of investment buys the most score. A single composite number is what gets a network security programme funded, but only the leverage breakdown tells you which control to buy next.

Formula

Network Security Score

score = 0.20·segmentation + 0.20·monitoring + 0.15·firewall hygiene + 0.15·inspection + 0.10·DDoS + 0.10·VPN + 0.10·DNS.

segmentation
Coverage of network and workload segmentation policy
monitoring
Share of the estate producing usable security telemetry
highest-leverage domain
Domain where weight × remaining gap is largest

Worked example

With the default values below, Network Security Score Calculator returns Network Security Score of 67.4. Change any input above and every figure here is recalculated in your browser.

Inputs used

Segmentation and micro-segmentation coverageaccepts 0–100 %
55 %
Firewall rule hygiene (no any-any, reviewed rules)accepts 0–100 %
72 %
Traffic under IPS and TLS inspectionaccepts 0–100 %
62 %
DDoS mitigation readinessaccepts 0–100 %
80 %
VPN and remote access postureaccepts 0–100 %
75 %
DNS security controls in placeaccepts 0–100 %
68 %
Network telemetry and monitoring coverageaccepts 0–100 %
70 %
Target scoreaccepts 0–100 /100
85 /100

Results

Network Security Score
67.4 /100
Grade
C — Fair
Residual Risk Exposure
32.6 /100
Risk Level
Low
Highest-Leverage Domain
Segmentation
Weakest Domain
Segmentation
Points to Target
17.6

Step by step

  1. 1Values used
  2. 2Network Security Score
  3. 3Network Security Score= 67.4 /100
  4. 4Grade= C — Fair
  5. 5Residual Risk Exposure= 32.6 /100
  6. 6Risk Level= Low
  7. 7Highest-Leverage Domain= Segmentation
  8. 8Weakest Domain= Segmentation

Assumptions and limits

  • The result is derived only from the 8 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 Security Score calculated?

score = 0.20·segmentation + 0.20·monitoring + 0.15·firewall hygiene + 0.15·inspection + 0.10·DDoS + 0.10·VPN + 0.10·DNS. Segmentation and monitoring carry the heaviest weight because they respectively bound and reveal every incident — one limits how far an attacker gets, the other determines whether you find out. The highest-leverage domain is not simply the weakest one: it is where weight multiplied by the remaining gap is largest, which is where the next point of investment buys the most score.

Why does Network Security Score matter?

A single composite number is what gets a network security programme funded, but only the leverage breakdown tells you which control to buy next.

What values do I need to enter?

This calculator takes 8 inputs: Segmentation and micro-segmentation coverage, Firewall rule hygiene (no any-any, reviewed rules), Traffic under IPS and TLS inspection, DDoS mitigation readiness, VPN and remote access posture, DNS security controls in place, Network telemetry and monitoring coverage, Target score. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.

Why does the weakest domain differ from the highest-leverage one?

Weakest is the lowest raw percentage; highest-leverage is weight × gap. A DNS security domain at 40% contributes 0.10 × 60 = 6 points of loss, while monitoring at 60% contributes 0.20 × 40 = 8. Fixing monitoring moves the score more even though DNS looks worse, which is exactly the sort of prioritisation a flat scorecard hides.

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