Glucose Variability Calculator
Enter up to 20 blood glucose readings to calculate your variability metrics - including the Coefficient of Variation (CV%), the gold-standard measure of glucose stability.
Educational estimator only - not medical advice.
Enter at least 2 readings above to calculate your glucose variability.
Glucose variability measures how much your blood sugar fluctuates. The key metric is the Coefficient of Variation (CV%) - recognised by the ATTD consensus as the standard measure of glucose variability:
Standard Deviation is calculated using the population formula: SD = sqrt(Sum(x - mean)^2 / n)
The Interquartile Range (IQR) is the difference between the 75th and 25th percentile values, providing a measure of spread that is robust to extreme outliers.
Research shows that high glucose variability - even with a "normal" HbA1c - increases risk of hypoglycemia, cardiovascular stress, and oxidative damage. A stable CV% below 36% is the target endorsed by international diabetes guidelines.
Chapter 2 of the FOD Mature Series dives deep into what glucose variability means for long-term health - why a stable average matters more than a low average, how CGMs reveal variability that finger-sticks miss, and practical strategies to reduce swings.
FOD Mature Series - Ch. 2This calculator is for educational and informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult your healthcare provider or a qualified diabetes educator regarding your personal health. Individual results may vary.