About the Stability Score

For a complete overview of all Levels scores and metrics, see How Levels Scores and Glucose Metrics Work: A Complete Guide.

Reducing the number and duration of spikes, and keeping a more stable glucose line throughout your day, are short-term targets that can support long-term metabolic health.

How the Stability Score works

The Stability Score shows how stable your glucose levels were on a given day.
It helps you track stability trends day over day.
It is represented on a scale of 60 to 100.
- You can think of this like a letter grade.
- A higher score indicates more stable glucose levels.
The score is based on standard deviation, which means it reflects your overall glucose variability, not just whether you had labeled spikes.
Levels' spike algorithm continuously monitors for significant glucose excursions and can prompt you to take action and observe how your glucose responds.

What range to aim for

Aim for 85 or higher on most days.
Think progress over perfection.
Scores above 90 are considered above average.

What factors influence your Stability Score

The Stability Score captures all glucose variability throughout the day, not just labeled spikes. Even smaller fluctuations that never cross the spike threshold can influence your score.

Your score increases when your glucose remains stable with minimal fluctuation.
Spikes lower your score, but so do frequent smaller rises and dips that add up over the course of the day. For example, a day with zero spikes but lots of gentle ups and downs can still score lower than a day with one spike but otherwise very flat glucose.
If you regain stability later in the day, your score can recover.

What "Std. Deviation (Variability)" means

Std. Deviation, or Variability, describes how much your glucose fluctuates throughout the day.
Lower variability generally means more stable glucose.
It is calculated by measuring how far your glucose readings vary from your daily average (in mg/dL).
This is the core input to your Stability Score. The less your glucose moves around your daily average, the higher your score will be.

What is an optimal amount of variability

For individuals without obesity or diabetes:

A typical average magnitude of glucose excursions (the difference between high and low points) is 26 to 28 mg/dL.

To help keep variability lower:

Try not to exceed a 30 mg/dL rise from your pre-meal glucose.
Aim for a post-meal value not exceeding 110 mg/dL.

Do exercise spikes affect your Stability Score?

No. Glucose spikes from exercise do not impact your Stability Score if they are marked as strenuous exercise. Learn more here.

How glucose spikes are calculated

Spikes are registered when both of the following are true:

Your glucose exceeds 109 mg/dL.
The difference between your baseline and the peak of the spike is +30 mg/dL or more.

For a deeper explanation of spikes, spike phases, and how the +X spike value is calculated, see Understanding Glucose Spikes.

What is baseline glucose?

Your baseline glucose is personalized to your data.
It is calculated using a rolling average of your previous four hours of glucose readings.
Levels uses this baseline to detect periods of stability and to measure how much your glucose rises during a spike.
Baseline is not the lowest visible point on your glucose graph. It is a computed average, so it may be higher or lower than any single reading you see on the chart. This is why subtracting two visible points on the graph will not match the spike value shown in the app.