A1c to average glucose (eAG) calculator
eAG restates your A1C in the same units as a glucose test, to show roughly what your average blood sugar has been over about 3 months. Type your results in the units on your report and it works out eAG as you type, in your browser.
AI-verified against cited sources. Awaiting expert reviewLast reviewed 2026-10-03Blood Sugar & Metabolism
Type your results above, or fill in the example, to see eAG.
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Educational information, not medical advice. Blood Test Tracker doesn’t diagnose or treat, and it doesn’t replace your clinician. Talk with your clinician before changing medications, supplements or care.
How it’s worked out
The formula
eAG (mg/dL) = 28.7 x HbA1c (%) - 46.7; eAG (mmol/L) = 1.59 x HbA1c (%) - 2.59
A worked example
Example numbers, not anyone’s real results, run through the same code as the calculator above.
| A1c | 7 % |
|---|---|
| eAG | 154 mg/dL |
For an adult, this result is above the usual range.
What eAG tells you
eAG stands for estimated average glucose. Your lab calculates it from your A1C result, so it is not a separate blood test. It describes your A1C in the same units as daily glucose readings (mg/dL or mmol/L). It comes from a formula built on a large study, so your true average could be higher or lower than the estimate.
Many people find a glucose number easier to relate to than a percentage. An A1C of 7%, for example, matches an eAG of about 154 mg/dL (8.6 mmol/L). It is useful for talking with your care team about your overall pattern, but it is an estimate and does not replace your A1C or your glucose readings.
Read the full page on eAG, with what a high or low result can mean.
Usual ranges
The ranges the result above is placed on. Your own lab’s printed range comes first if it gives one.
- Adultsup to 116 mg/dL
Sources: American Diabetes Association (Diabetes Care), Diabetes Care (A1C-Derived Average Glucose study group), Labcorp
Sources
The equation
- Translating the A1C Assay Into Estimated Average Glucose Values, Diabetes Care (A1C-Derived Average Glucose study group) (2008)
- 6. Glycemic Goals, Hypoglycemia, and Hyperglycemic Crises: Standards of Care in Diabetes-2026, American Diabetes Association (Diabetes Care) (2026)
3 more sources for the ranges and the explanation
- 2. Diagnosis and Classification of Diabetes: Standards of Care in Diabetes-2026, American Diabetes Association (Diabetes Care) (2026)
- Glucose (PubChem compound 5793), PubChem, National Library of Medicine
- Hemoglobin A1c (test 001453), Labcorp
AI-verified against cited sources. Awaiting expert review. Last reviewed 2026-10-03. The calculator is version 1.0.0 of our code for this equation, tested against published examples. How we build and check these pages.