Overall Network Health Score Calculator

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

About Overall Network Health Score Calculator

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

Worked example

With the default values below, Overall Network Health Score Calculator returns Overall Health Score of 76.4. Change any input above and every figure here is recalculated in your browser.

Inputs used

Availability achievedaccepts 0–100 %: 99.94 %
Average latencyaccepts 0.1–2,000 ms: 28 ms
Latency targetaccepts 0.1–2,000 ms: 30 ms
Packet lossaccepts 0–100 %: 0.05 %
Peak link utilisationaccepts 0–200 %: 62 %
Devices fully patchedaccepts 0–100 %: 90 %
Network incidents per monthaccepts 0–100,000 incidents: 14 incidents

Results

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

1Values used
2Overall Network Health Score
3Overall Health Score= 76.4 /100
4Rating= B — Good
5Availability Component= 28.2 /30
6Performance Component= 24.0 /25
7Capacity Component= 5.4 /20
8Weakest Area= Capacity headroom

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 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.