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A1C Calculator (HbA1c to Average Glucose)
Convert HbA1c to estimated average glucose (eAG) and back. Includes ADA diabetes management category - normal, prediabetes, diabetes.
HEALTHConvert HbA1c (glycated hemoglobin) percentage to estimated average glucose (eAG) in mg/dL or mmol/L and back, with ADA 2026 diabetes management category (normal, prediabetes, diabetes).
Uses the ADAG study formula: eAG = 28.7 × A1C - 46.7. A 1% rise in A1C corresponds to about 28.7 mg/dL higher average glucose. Categories: normal under 5.7, prediabetes 5.7-6.4, diabetes 6.5 or higher. Most adults target A1C under 7%; very stable patients aim for under 6.5%; older or complex patients under 8%.
Disclaimer: Educational tool only. A1C results depend on hemoglobin variants, anemia, recent transfusions, and lab calibration. Always interpret with your physician.
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Frequently Asked Questions
What is the A1C Calculator (HbA1c to Average Glucose) for?
Convert HbA1c (glycated hemoglobin) percentage to estimated average glucose (eAG) in mg/dL or mmol/L and back, with ADA 2026 diabetes management category (normal, prediabetes, diabetes).
How do I use the A1C Calculator (HbA1c to Average Glucose)?
Uses the ADAG study formula: eAG = 28.7 × A1C - 46.7. A 1% rise in A1C corresponds to about 28.7 mg/dL higher average glucose. Categories: normal under 5.7, prediabetes 5.7-6.4, diabetes 6.5 or higher. Most adults target A1C under 7%; very stable patients aim for under 6.5%; older or complex patients under 8%.
How accurate are my a1c (hba1c to average glucose) results?
Educational tool only. A1C results depend on hemoglobin variants, anemia, recent transfusions, and lab calibration. Always interpret with your physician.
Is the A1C Calculator (HbA1c to Average Glucose) free to use?
Yes - every calculator on WhichCalc is completely free with no signup, no usage limits, and no tracking on the calculation itself. Results display instantly in your browser and your inputs are never sent to a server. Bookmark the page if you use this calculator regularly.
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