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A1C to Estimated Average Glucose

Evaluate the ADAG study average glucose regression from A1C.

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Calculator inputs

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How to use this calculator

  1. Enter the known values in the units shown. Results update as you type.
  2. Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
  3. Use the worked example to check the method. Reset restores the starting fields.

Use the result with context

Health results are educational estimates, not a diagnosis or treatment recommendation. A qualified clinician can interpret measurements in the context of your health.

Formula and method

A1C 7% gives estimated average glucose 154.2 mg/dL under the ADAG regression.

Estimated average glucose (mg/dL) = 28.7 × A1C (%) − 46.7.

Worked example

Enter these known values and leave the other values blank.

HbA1c
7 %
Average glucose
154.2 mg/dL

Assumptions and limitations

  • A study-derived average glucose estimate, not a current glucose reading. A1C can be misleading with altered red-cell turnover and some hemoglobin variants. The diagnosis choice only changes contextual text; this equation does not diagnose diabetes.
  • Use the displayed units and measurements from the same context. Editable fields support arithmetic inverses when enough independent values are supplied. Clear a preset value before solving it as an unknown.
  • This tool performs the stated arithmetic model. It does not establish a diagnosis, prescribe treatment or replace laboratory and clinical assessment.

Common questions

What does this calculation represent?

A study-derived average glucose estimate, not a current glucose reading. A1C can be misleading with altered red-cell turnover and some hemoglobin variants. The diagnosis choice only changes contextual text; this equation does not diagnose diabetes.

Can I solve for a different field?

Clear the unknown field and enter enough independent values in the remaining editable controls. A relationship cannot recover a unique value when a dividing quantity is zero.

References

Bookify adds independently reviewed bounds: Use A1C between 4 and 15 percent for this numerical regression.

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