What it calculates

This tool converts HbA1c to the estimated average glucose (eAG) it corresponds to, and also works the other way round. The result is an estimate based on a research formula. It does not replace your lab report or your doctor's advice.

What your result means

HbA1c shows your average blood sugar over roughly the last three months. The eAG (estimated average glucose) restates that percentage in the same units as a home glucose meter, so the two are easier to compare. For example, an HbA1c of 7% corresponds to an average of about 154 mg/dL (8.5 mmol/L).

For what the test measures and how it is used, read the HbA1c test explained. For usual blood sugar ranges, see normal blood sugar levels.

Why your meter readings may not match

The formula comes from a study that compared HbA1c with frequent glucose readings. It describes an average across many people. Your own fasting and after-meal readings can be quite different from the eAG, and two people with the same HbA1c can have very different day-to-day swings.

HbA1c can also read falsely when red blood cells live for a shorter or longer time than usual, for example with anaemia, thalassaemia or recent blood loss. This is common enough in India that your doctor may use other tests alongside it.

When to talk to a doctor

Ask your doctor to explain any HbA1c in the diabetes range, and to interpret any big mismatch between your HbA1c and your home readings. Targets are individual and are set by your treating doctor.

How this tool works

Formula: eAG (mg/dL) = 28.7 × HbA1c − 46.7. eAG (mmol/L) = 1.59 × HbA1c − 2.59. Reverse: HbA1c = (eAG in mg/dL + 46.7) / 28.7.
Source: Nathan DM et al. Diabetes Care 2008
Version: 1.0.0

This tool does not replace a consultation. Results are general information; your doctor interprets them with your history and examination.

When to see an endocrinologist

You have extreme thirst, frequent urination, vomiting or drowsiness along with high sugar readings
You have had a very low sugar episode with sweating, confusion or fainting

Chest pain, fainting, severe breathlessness or confusion: call 108 or 112, or go to the nearest emergency department.

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HbA1c to average glucose converter