Path Health Score Calculator
Score a WAN path out of 100 from latency, jitter, loss and delivered throughput, with an estimated MOS.
About Path Health Score Calculator
Each impairment is normalised to a 0–100 sub-score with a penalty slope reflecting how much real-time traffic tolerates it, then combined with weights that put loss and latency ahead of raw throughput. The MOS estimate applies the same impairments to the ITU five-point voice quality scale. A single number lets an SD-WAN policy or a monitoring dashboard rank paths consistently instead of arguing about which of four raw metrics matters most today.
Formula
Path Health Score
score = 0.3 × latency sub-score + 0.2 × jitter sub-score + 0.3 × loss sub-score + 0.2 × throughput sub-score.
- latency sub-score
- 100 minus 1.2 points per millisecond above a 20 ms floor
- loss sub-score
- 100 minus 40 points per percent of loss
Worked example
With the default values below, Path Health Score Calculator returns Path Health Score of 78.2. Change any input above and every figure here is recalculated in your browser.
Inputs used
- One-way latencyaccepts 0–2,000 ms
- 45 ms
- Jitteraccepts 0–500 ms
- 8 ms
- Packet lossaccepts 0–50 %
- 0.4 %
- Delivered share of committed rateaccepts 0–100 %
- 92 %
Results
- Path Health Score
- 78.2 /100
- Grade
- B — Good
- Estimated Voice MOS
- 3.68
- Recommended Use
- Suitable for voice and video
- Loss Sub-score
- 84.0 /100
Step by step
- 1Values used
- 2Path Health Score
- 3Path Health Score= 78.2 /100
- 4Grade= B — Good
- 5Estimated Voice MOS= 3.68
- 6Recommended Use= Suitable for voice and video
- 7Loss Sub-score= 84.0 /100
Assumptions and limits
- The result is derived only from the 4 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 2 decimal places, 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 Path Health Score calculated?
score = 0.3 × latency sub-score + 0.2 × jitter sub-score + 0.3 × loss sub-score + 0.2 × throughput sub-score. Each impairment is normalised to a 0–100 sub-score with a penalty slope reflecting how much real-time traffic tolerates it, then combined with weights that put loss and latency ahead of raw throughput. The MOS estimate applies the same impairments to the ITU five-point voice quality scale.
Why does Path Health Score matter?
A single number lets an SD-WAN policy or a monitoring dashboard rank paths consistently instead of arguing about which of four raw metrics matters most today.
What values do I need to enter?
This calculator takes 4 inputs: One-way latency, Jitter, Packet loss, Delivered share of committed rate. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.