A1c to Average Glucose (eAG) Calculator

How it is calculated

eAG (mg/dL) = 28.7 × A1c − 46.7; eAG (mmol/L) = 1.5944 × A1c − 2.594.

What your result means

• eAG is an average over roughly the past two to three months; daily readings swing above and below it.
• Conditions that change red blood cell lifespan, such as some anemias or hemoglobin variants, can make A1c and eAG read higher or lower than true average glucose.
• Your own lab's printed range and your clinician's read of your history come first; this calculator is educational and is not a diagnosis.

Test the inputs

The Metabolic and insulin panel measures the values this calculator uses. Related: hemoglobin a1c, fasting glucose, fasting insulin.

Common questions

What A1c equals an average glucose of 154 mg/dL?

An A1c of 7%, according to the ADAG study table.

Why doesn't eAG match my meter average?

Meter readings sample particular moments, while A1c reflects the whole day and night over weeks.

Can I convert to mmol/L?

Yes. The calculator also shows mmol/L, using 1.5944 × A1c − 2.594.

References

1. Translating the A1C assay into estimated average glucose values. Diabetes Care, 2008.