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Glucose to A1c Calculator

Estimate A1c from average glucose.

How to use

  1. Enter your values in the fields above.
  2. Press Calculate to see your result instantly.
  3. Use the Share button to copy a link to your result.

About this calculator

This calculator estimates HbA1c from an average blood glucose reading, using the reverse of the ADAG study formula (A1c = (eAG + 46.7) / 28.7), the same equation labs use in the opposite direction to translate a meter's average glucose into the A1c percentage doctors track over three months.

Diabetes educators and patients use it to get a rough sense of where their A1c might land based on their glucose meter's average, and nursing and medical students use it to practice the eAG-to-A1c relationship. It's an estimate for education purposes, not a substitute for a lab-drawn A1c test.

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