CGM Glucose Management Indicator (GMI %) & Coefficient of Variation (%CV) Calculator

Compute CGM GMI (%) and glycemic variability %CV from mean sensor glucose and SD.

Glucose Management Indicator (GMI)
6.71 % GMI
Glycemic Coefficient of Variation (%CV) 30.99 % (target ≤36%)
Time in Range (70–180 mg/dL) 74 % TIR
Estimated Glycemia Risk Index 31.2 score
Inputs
⚡ Scenarios:
mg/dL
14- to 90-day mean CGM sensor glucose in mg/dL.
mg/dL
Standard deviation (SD) of CGM sensor glucose readings in mg/dL.
% TIR
Percentage of readings within 70–180 mg/dL (target >70%).
Results & Graph
Glucose Management Indicator (GMI)
6.71 % GMI
Glycemic Coefficient of Variation (%CV)
30.99 % (target ≤36%)
Time in Range (70–180 mg/dL)
74 % TIR
Estimated Glycemia Risk Index
31.2 score

Glucose Management Indicator (GMI)

Graph 1 • CGM GMI % & Glycemic CV% • Domain Architecture & Live Telemetry Maps Mean Sensor Glucose Mg Dl, Sensor Glucose Std Dev Mg Dl, Time In Range70to180 Pct through CGM GMI % & Glycemic CV% Formula.
CGM GMI % & Glycemic CV% • Clinical & Physiological Reference Scale Low / Baseline Target / Reference Elevated / Watch High / Action Glucose Management Indicator (GMI): 6.71 % GMI Glycemic Coefficient of Va 30.99 % (target ≤36% Time in Range (70–180 mg/d 74 % TIR Estimated Glycemia Risk In 31.2 score
Graph 2 • Glucose Management Indicator (GMI) Across Mean Sensor Glucose Mg Dl Sweep (40% → 160%) Evaluates GMI (%) = 3.31 + 0.02392 × MeanCGM_mg_dL; Glycemic_CV (%) = (Glucose_S across 7 operating points (current input highlighted).
0 % GMI 4.81 % GMI 9.61 % GMI 4.67 56.80mg/dL 5.35 85.20mg/dL 6.03 113.6mg/dL 6.71 142mg/dL 7.39 170.4mg/dL 8.07 198.8mg/dL 8.74 227.2mg/dL
Graph 3 • Joint Sensitivity: Mean Sensor Glucose Mg Dl × Sensor Glucose Std Dev Mg Dl Compares Glucose Management Indicator (GMI) when Sensor Glucose Std Dev Mg Dl is shifted +25% (solid) vs. −25% (dashed).
0 % GMI 4.25 % GMI 8.50 % GMI --- Sensor Glucose Std Dev Mg Dl @ 75% 5.69 -30% 6.20 -15% 6.71 +0% 7.22 +15% 7.73 +30%
Summary: A mean CGM glucose of 142 mg/dL (SD 44 mg/dL) yields a GMI of 6.71% and a Glycemic Variability %CV of 31% (Stable ≤36%).
Summary: A mean CGM glucose of 142 mg/dL (SD 44 mg/dL) yields a GMI of 6.71% and a Glycemic Variability %CV of 31% (Stable ≤36%).
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Formula & Mathematical Methodology: CGM GMI % & Glycemic CV% Formula

GMI (%) = 3.31 + 0.02392 × MeanCGMmgdL
GlycemicCV (%) = (GlucoseSD / MeanCGM) × 100
GMI (%) = 3.31 + 0.02392 × MeanCGM_mg_dL; Glycemic_CV (%) = (Glucose_SD / MeanCGM) × 100
  • meanSensorGlucoseMgDl: Mean Sensor Glucose Mg Dl (mg/dL)
  • sensorGlucoseStdDevMgDl: Sensor Glucose Std Dev Mg Dl (mg/dL)
  • timeInRange70to180Pct: Time In Range70to180 Pct (% TIR)

Rounding: Clinical scores round to statutory integer or decimal precision; physiological metrics round to 2 decimal places.

Worked Example: Clinical / Physiology Scenario: CGM GMI % & Glycemic CV%

Compute CGM GMI (%) and glycemic variability %CV from mean sensor glucose and SD.

  1. Enter lab values, anthropometric measurements, or performance test metrics.
  2. Evaluate the reference equation: GMI (%) = 3.31 + 0.02392 × MeanCGM_mg_dL; Glycemic_CV (%) = (Glucose_SD / MeanCGM) × 100.
  3. Inspect the primary classification, supporting indices, and 3 SVG charts.
Result: Computes CGM GMI % & Glycemic CV% via GMI (%) = 3.31 + 0.02392 × MeanCGM_mg_dL; Glycemic_CV (%) = (Glucose_SD / MeanCGM) × 100.

Frequently Asked Questions

How does the CGM Glucose Management Indicator (GMI %) & Coefficient of Variation (%CV) Calculator compute its result?

It evaluates GMI (%) = 3.31 + 0.02392 × MeanCGM_mg_dL; Glycemic_CV (%) = (Glucose_SD / MeanCGM) × 100 directly in your browser and updates three custom SVG visualizations in real time.

Can I use Goal Seek to solve backwards for a target lab value or pace?

Yes. Click "🎯 Goal Seek" in the results toolbar to solve backwards for any numeric input parameter.

Are my health and biometric inputs kept private?

Yes. All calculations run 100% locally on your device with zero external transmission.

Health & Fitness · Metabolic & Endocrine Health

CGM Glucose Management Indicator (GMI %) & Coefficient of Variation (%CV) Calculator: inputs, method, and how to read the result

Compute CGM GMI (%) and glycemic variability %CV from mean sensor glucose and SD.

Choose inputs for the case you are checking

The defaults are illustrative. Replace them with values for your case and keep the units shown beside each field.

  • Mean Sensor Glucose Mg Dl: 14- to 90-day mean CGM sensor glucose in mg/dL.
  • Sensor Glucose Std Dev Mg Dl: Standard deviation (SD) of CGM sensor glucose readings in mg/dL.
  • Time In Range70to180 Pct: Percentage of readings within 70–180 mg/dL (target >70%).

What the calculation includes

With the default values shown, Glucose Management Indicator (GMI) is 6.71 % GMI. The calculation follows CGM GMI % & Glycemic CV% Formula; the formula and variable definitions above show how the inputs combine.

One-input check: With the other defaults held constant, changing Mean Sensor Glucose Mg Dl from 142 mg/dL to 156 mg/dL changes Glucose Management Indicator (GMI) from 6.71 % GMI to 7.04 % GMI. This is a comparison inside the calculator's stated model, not a prediction.

Where to use caution

  • Uses peer-reviewed clinical and sports physiology formulas.
  • For educational and informational reference only; clinical scores do not replace physician judgment or laboratory reference ranges.

Scope: Global Clinical & Sports Science Consensus Check the assumptions and limitations against your situation before relying on the estimate.

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