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Overall Network Health Score Calculator

Roll availability, performance, capacity, security and operations metrics into one weighted network health score.

Inputs

%
ms
ms
%
%
%
incidents

Overall Health Score

76.4/100

Rating

B — Good

Availability Component

28.2/30

Performance Component

24.0/25

Capacity Component

5.4/20

Weakest Area

Capacity headroom

Step by step

  1. Values used

    Availability achieved = 99.94 %; Average latency = 28 ms; Latency target = 30 ms; Packet loss = 0.0500 %; Peak link utilisation = 62 %; Devices fully patched = 90 %; Network incidents per month = 14 incidents

  2. Overall Network Health Score

    health = availability (30) + performance (25) + capacity headroom (20) + patch currency (15) + operational load (10).

  3. Overall Health Score

    = 76.4 /100

  4. Rating

    = B — Good

  5. Availability Component

    = 28.2 /30

  6. Performance Component

    = 24.0 /25

  7. Capacity Component

    = 5.4 /20

  8. Weakest Area

    = Capacity headroom

How it works

Availability is scored only across the 99–100% range because that is where operational networks actually differ, and capacity is scored on headroom below an 85% ceiling rather than raw utilisation. Comparing each component against its own maximum identifies the weakest area, which is not necessarily the one with the fewest points. One composite number is what gets reported upward, but the weakest-area output is what stops that number from hiding a single dimension that is quietly failing.

Formula

Overall Network Health Score

health = availability (30) + performance (25) + capacity headroom (20) + patch currency (15) + operational load (10).

availability
Scored across the 99–100% band, where the meaningful variation is
capacity headroom
Scored against an 85% peak-utilisation ceiling
operational load
Incidents per month, scored against a 30-per-month reference

Frequently Asked Questions

How is Overall Network Health Score calculated?

health = availability (30) + performance (25) + capacity headroom (20) + patch currency (15) + operational load (10). Availability is scored only across the 99–100% range because that is where operational networks actually differ, and capacity is scored on headroom below an 85% ceiling rather than raw utilisation. Comparing each component against its own maximum identifies the weakest area, which is not necessarily the one with the fewest points.

Why does Overall Network Health Score matter?

One composite number is what gets reported upward, but the weakest-area output is what stops that number from hiding a single dimension that is quietly failing.

What values do I need to enter?

This calculator takes 7 inputs: Availability achieved, Average latency, Latency target, Packet loss, Peak link utilisation, Devices fully patched, Network incidents per month. 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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