Estimated Average Glucose Calculator

Why eAG was introduced

The ADA introduced eAG reporting to help bridge the gap between the A1c percentage that clinicians monitor and the mmol/L or mg/dL values that people with diabetes see on their meters every day. An A1c of 7% corresponds to an eAG of approximately 8.6 mmol/L (154 mg/dL) — a value that feels concrete when compared against meter readings.

The ADAG (A1c-Derived Average Glucose) study validated this formula using continuous glucose monitoring data across a racially diverse population with and without diabetes. The resulting linear formula provides a reasonable estimate for most individuals, though individual variation of up to ±0.5–1.5 mmol/L (10–30 mg/dL) is documented.

eAG versus daily readings

eAG represents an average across all times of day, including post-meal peaks. It will therefore typically be higher than a pre-breakfast fasting reading on a home meter. A person with an A1c of 7% (eAG 8.6 mmol/L) might see fasting readings of 6–7 mmol/L and post-meal readings of 9–11 mmol/L, both consistent with that average.