CGM Metrics Dashboard
Enter your CGM report data to see a full metrics summary with colour-coded pass/fail checks against international consensus targets.
Educational estimator only - not medical advice.
Your CGM Data
Metrics Summary
Enter your CGM data above to see your personalised metrics dashboard.
What Each CGM Metric Means
| Metric | Target | What it measures |
|---|---|---|
| TIR% | >70% | Time blood glucose was between 70-180 mg/dL - the primary CGM success metric |
| TBR% L1 | <4% | Time below 70 mg/dL - hypoglycaemia exposure requiring reduction |
| TBR% L2 | <1% | Time below 54 mg/dL - severe hypo territory, a safety-critical metric |
| TAR% L1 | <25% | Time above 180 mg/dL - associated with long-term complication risk |
| TAR% L2 | <5% | Time above 250 mg/dL - urgent hyperglycaemia; ketone risk zone |
| CV% | <36% | Coefficient of variation - measures glucose variability; stable glucose = lower CV |
| GMI | Individual | Glucose Management Indicator - estimated A1c from CGM average. May differ from lab A1c by 0.5-1.0% |
ATTD consensus targets are from the Advanced Technologies & Treatments for Diabetes international guidelines (Battelino et al., 2019) - the most widely adopted clinical standard for CGM interpretation.
How to Improve Each Metric
- Improve TIR: Optimise pre-meal timing, carb counting accuracy, and post-meal activity; review basal rates with your diabetes team
- Reduce TBR: Review overnight basal/bedtime snack; check pre-exercise insulin adjustments; ensure rescue carbs are accessible
- Reduce TAR: Address post-meal spikes with meal composition changes and meal-time insulin timing
- Reduce CV%: Focus on consistency - consistent meal sizes, consistent timing, consistent activity levels reduce variability
- GMI vs Lab A1c: If GMI and lab A1c differ by >0.5%, discuss with your team - haemoglobin variants, iron deficiency, or sensor calibration may be factors
Learn More
Chapters 2-3 of the FOD Trilogy (Mature Management series) cover CGM interpretation in depth - including how to read AGP reports, set personalised targets, and use time-in-range data to make meaningful management adjustments.
FOD Trilogy: CGM Deep Dive
! Medical Disclaimer
This calculator is for educational and informational purposes only. CGM targets should be individualised with your healthcare team - the ATTD consensus targets shown are general population guidelines and may not apply to all individuals (e.g. elderly patients, those with hypoglycaemia unawareness, or pregnancy). Always consult your diabetes care team for personalised target setting.
This calculator is for educational and informational purposes only. CGM targets should be individualised with your healthcare team - the ATTD consensus targets shown are general population guidelines and may not apply to all individuals (e.g. elderly patients, those with hypoglycaemia unawareness, or pregnancy). Always consult your diabetes care team for personalised target setting.