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A1C to eAG Converter

Convert HbA1c percent to estimated Average Glucose (eAG) in mg/dL and mmol/L using the ADA Nathan 2008 formula (eAG = 28.7 x A1C - 46.7). Works in both directions, with ADA diagnostic categories and target context. Educational only.

A1C to eAG converter

Enter the percent value from your lab report. Accepted range is4% to 15.5%.

Estimated average glucose

7%A1C

154.2 mg/dL|8.56 mmol/L

Risk category
Diabetes range (ADA: A1C 6.5% or higher).
ADA target
ADA general goal for most non-pregnant adults with diabetes: A1C below 7%. A clinician should individualize the target.
Daily glucose context
Estimated average glucose is 154.2 mg/dL (8.56 mmol/L). It summarizes a population-average relationship over roughly 2 to 3 months and cannot predict individual daily readings.
What A1C measures
A1C reflects roughly 8 to 12 weeks of average blood glucose (about 2 to 3 months), weighted toward the most recent 30 days.
Formula used
ADAG study regression (Nathan et al., Diabetes Care 2008): eAG mg/dL = 28.7 x A1C - 46.7

Important

This is an estimate based on a population average. Your actual average glucose may vary. Always discuss A1C results with your healthcare provider.

Frequently Asked Questions about the A1C to eAG Converter

What does A1C measure?
A1C (HbA1c) is the percentage of hemoglobin in your red blood cells that has glucose bound to it. Because red blood cells live about 120 days, A1C reflects your average blood glucose over roughly the past 2 to 3 months, weighted toward the most recent 30 days. Single fingerstick readings show only one moment in time; A1C captures the trend.
How does this converter calculate estimated average glucose?
It uses the regression published by Nathan et al. in Diabetes Care (2008), the ADAG study endorsed by the American Diabetes Association: eAG (mg/dL) = 28.7 x A1C - 46.7. The inverse equation A1C (%) = (eAG + 46.7) / 28.7 lets the calculator work in both directions. The ADAG study collected continuous glucose monitor and self-monitored blood glucose data alongside A1C from 507 participants to derive the relationship.
What are the ADA A1C targets?
An A1C below 7 percent is a common goal for many nonpregnant adults with diabetes, but targets are individualized. A clinician may choose a tighter or less stringent goal based on hypoglycemia risk, health status, complications, treatment burden, and preferences. The converter does not select a target or replace current ADA guidance for a specific patient.
How do I convert mg/dL to mmol/L?
Divide mg/dL by 18.0182 to get mmol/L; multiply mmol/L by 18.0182 to get mg/dL. The factor comes from glucose's molecular weight (180.156 g/mol) divided by 10. So 100 mg/dL equals about 5.55 mmol/L, and 7 mmol/L equals about 126 mg/dL. US labs report glucose in mg/dL while most countries outside the US use mmol/L.
Why does A1C matter for long-term health?
Large trials including the DCCT and UKPDS show that lower A1C is associated with lower rates of diabetes complications, especially retinopathy, nephropathy, and neuropathy. Risk rises sharply once A1C climbs above 8% to 9% and persists for years. Each sustained 1-point drop in A1C in those trials reduced microvascular complication rates by roughly 30% to 40%, which is why A1C is the standard tracking metric for diabetes care.

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