HbA1c chart

What the HbA1c conversion actually does

1. HbA1c is the share of haemoglobin carrying glucose. Red cells live around three months, so the figure describes roughly that window, weighted towards the recent weeks.
2. The ADAG regression translates that share into an average glucose. It was fitted on 507 people wearing continuous monitors, and it explained about 84% of the variation — so the output is a central estimate, not your reading.
3. mmol/L comes from dividing by 18.016, the molar mass of glucose expressed in these units. mmol/mol comes from the separate NGSP master equation.
4. Every row of the chart on this site is computed from these equations at build time, which is why the whole-percentage rows match the NGSP's own published table exactly.
5. None of it is interpreted here. HbA1c is unreliable in anaemia, some haemoglobin variants, recent transfusion, advanced kidney disease and pregnancy — several of which are common in India — and only a clinician can weigh that.

eAG (mg/dL)     = 28.7 x HbA1c(%) - 46.7
eAG (mmol/L)    = eAG (mg/dL) / 18.016
HbA1c (mmol/mol) = (HbA1c(%) - 2.15) x 10.929

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