How FitA1C Works

1. What is FitA1C?

FitA1C is a health intelligence dashboard designed for people managing diabetes. It pulls data from your connected devices — continuous glucose monitors, fitness trackers, and wearables — and combines them into a single daily health score on a 0-10 scale. The score gives you a quick, objective snapshot of how well you're managing glucose, staying active, recovering, and moving throughout your day. Important: FitA1C is NOT a medical device and does NOT provide medical advice. All default thresholds, goals, and scoring weights are starting-point presets that should be personalized in consultation with your healthcare provider. Every person's targets are different — what's right for one individual may not be appropriate for another. Always work with your doctor or endocrinologist to determine the correct values for your situation.

2. Data Sources

• FreeStyle Libre (Required): Continuous glucose monitor. Provides real-time glucose readings, daily averages, time-in-range percentages, and min/max values. This is the only required integration. Support for Dexcom CGMs is coming soon.
• WHOOP (Optional): Wearable recovery tracker. Provides daily recovery scores (0-100%), sleep performance data, and estimated daily step counts derived from strain data.
• Strava (Optional): Fitness platform. Provides weekly activity counts and total training duration in hours.

3. The FitA1C Score

Your total FitA1C Score is a weighted average of up to four component scores, each on a 0-10 scale. When all integrations are connected, the default weights are: Glucose 50%, Activity 20%, Recovery 20%, Steps 10%. If you only have some integrations connected, the weights are automatically redistributed proportionally among the active components. For example, with only Glucose connected, it counts as 100% of your score.

4. Glucose Score (Default: 50%)

The glucose score is based on your 7-day average glucose reading (mg/dL). It uses a threshold-based grading system with linear interpolation between grades. All glucose thresholds shown below are default presets and can be fully customized in Settings. Please work with your doctor to determine the right glucose targets for you — these will vary based on your type of diabetes, medications, and personal health goals.

Values between thresholds are interpolated linearly. For example, a 7-day average of 128 mg/dL (halfway between A=120 and B=135) would score approximately 9.5.

5. Activity Score (Default: 20%)

The activity score is driven by your Strava data from the past 7 days. It considers both the number of activities and total training hours against your goals:

• Activity Count Goal: Default: 4 activities per week (customizable). Hitting this target earns a full 10/10. Adjust this to match your fitness plan as recommended by your care team.
• Duration Goal: Default: 6 hours per week (customizable). Meeting the hours goal unlocks an over-performance bonus up to 1.2x.
• Score Formula: The higher ratio of (activities / goal) or (hours / goal) drives the score, multiplied by 10. If the hours goal is met, the score can exceed 10 (up to 12) to reward exceptional weeks.

6. Recovery Score (Default: 20%)

The recovery score is powered by WHOOP's daily recovery metric, which measures how prepared your body is to take on strain based on heart rate variability, resting heart rate, and sleep quality.

• Primary Driver: Your 7-day average recovery percentage. A 70% average recovery = 7.0/10 score.
• Bonus: Up to +0.5 if today's recovery exceeds 90% and your 7-day average is above 80%. This rewards consistently strong recovery with an exceptional day.

7. Steps Score (Default: 10%)

Daily steps are estimated from WHOOP strain data (WHOOP doesn't directly track steps). The score is calculated against your daily step goal:

• Step Goal: Default: 7,500 steps/day (customizable). Meeting this goal earns a full 10/10. Set this based on your mobility level and what your doctor recommends.
• Bonus Ceiling: Default: 10,000 steps/day (customizable). Exceeding the goal toward this ceiling earns up to +0.5 bonus points.
• Score Formula: Base score = (average daily steps / goal) x 10, capped at 10. Bonus added for steps beyond the goal.

8. Dynamic Weight Redistribution

If you don't have all integrations connected, FitA1C automatically redistributes the weights so they still sum to 100%. The redistribution is proportional — each active component's weight increases by the same factor. For example:

9. Estimated A1C

FitA1C calculates an estimated A1C using the standard ADAG formula: Estimated A1C = (Average Glucose + 46.7) / 28.7. This uses your 90-day average glucose from your CGM readings. This is a mathematical estimate only — it is NOT a lab result and should never replace blood-based A1C testing. Your actual A1C may differ significantly. Always rely on lab results ordered by your healthcare provider for clinical decision-making.

10. Score History & Trends

The Score History chart shows your daily Total Score and individual component scores over time. This helps you identify patterns — for example, you might notice your glucose score dips on days after poor recovery, or that your overall score improves during weeks with more activity. Data is synced automatically and stored securely in the cloud.

11. Customizing Your Goals

Every default value in FitA1C is a preset that can and should be customized. From your Settings page, you can adjust glucose grade thresholds, activity count and duration targets, step goals, bonus ceilings, and the relative weight of each component in your total score. We strongly recommend reviewing these settings with your doctor or endocrinologist to ensure they reflect your personal health targets. What works for one person may not be appropriate for another — your care team knows your situation best.

12. Medical Disclaimer

FitA1C is a personal health tracking tool, NOT a medical device, and does NOT provide medical advice, diagnosis, or treatment recommendations. The scores, grades, and estimates displayed are informational only and are based on general-purpose default presets that may not be appropriate for your individual situation. All thresholds, goals, and scoring weights are fully customizable and should be personalized under the guidance of your healthcare provider. The estimated A1C is a mathematical approximation and should never be used as a substitute for lab testing. Always consult your doctor, endocrinologist, or qualified healthcare professional before making any changes to your diabetes management plan. Do not adjust medication, insulin dosing, or treatment based on FitA1C data alone. If you are experiencing a medical emergency, contact your doctor or call emergency services immediately.