Glucose Management Indicator (GMI) from CGM
Estimates the Glucose Management Indicator, the A1C-like value computed from a CGM mean glucose, in percent and mmol/mol.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Mean glucose from the CGM report
- 150
- Glucose unit
- mg/dL
Result: GMI 6.9% (52 mmol/mol) from a mean CGM glucose of 150 mg/dL.
The tool opens with these values already filled in. Replace them with your own.
What you enter
- Mean glucose from the CGM report
- Glucose unit
- Days of wear
- Percent of time the CGM was active
How this is calculated
Citation
Bergenstal RM, Beck RW, Close KL, et al. Glucose Management Indicator (GMI): A New Term for Estimating A1C From Continuous Glucose Monitoring. Diabetes Care. 2018;41(11):2275-2280. Read the sources: Bergenstal 2018 ↗, Updated GMI 2026 ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.