Glucose from mg/dL to mmol/L and back, and HbA1c to estimated average glucose (eAG) and IFCC mmol/mol, with ADA categories.
Mis à jour Exemples vérifiés : 7
100 mg/dL is 5.55 mmol/L using 18.016 mg/dL per mmol/L; as a fasting reading it falls in the “Prediabetes” band.
Glucose weighs 180.16 g/mol, so 1 mmol/L is 18.016 mg/dL. The other common choice is 18 (a rounded factor many meters use); the two differ by less than 0.1 %.
As a fasting reading, 100 mg/dL is “Prediabetes” (ADA: < 70 low, 70–99 normal, 100–125 prediabetes, ≥ 126 diabetes range).
Glucose converts between units through its molar mass: 1 mmol/L is 18.016 mg/dL (180.16 g/mol ÷ 10), which many meters and tables round to 18. HbA1c converts to estimated average glucose (eAG) with the ADAG regression, eAG in mg/dL = 28.7 × A1c − 46.7, and to IFCC units in mmol/mol with the NGSP–IFCC master equation. Results are placed in the American Diabetes Association (ADA) categories.
People use it to read results reported in the other unit, such as a US meter against a UK lab report. 100 mg/dL is 5.55 mmol/L, the fasting level where ADA's prediabetes range begins, and an HbA1c of 7 % corresponds to an eAG of 154 mg/dL (8.6 mmol/L) and 53 mmol/mol.
The categories are population thresholds for laboratory tests confirmed by repeat testing, not for a single meter reading. eAG is a regression estimate (R² = 0.84 in the 507-person ADAG study), so an individual's measured average can differ, and anaemia or haemoglobin variants can distort HbA1c.
Source de vérification : Python 3.8 decimal: 100 / 18.016 = 5.5506; ADA fasting 100–125 mg/dL is prediabetes
Source de vérification : NGSP eAG table pairs 126 mg/dL with 7.0 mmol/L (factor 18); ADA fasting ≥ 126 mg/dL is diabetes range
Source de vérification : Python 3.8 decimal: 7.0 × 18.016 = 126.112
Source de vérification : NGSP table: 7% ↔ 154 mg/dL, 8.6 mmol/L, 53 mmol/mol; ADAG 28.7 × 7 − 46.7 = 154.2
Divide by 18, or 18.016 exactly, from glucose's molar mass of 180.16 g/mol; to go from mmol/L to mg/dL, multiply. So 100 mg/dL is 5.55 mmol/L and 7.0 mmol/L is 126 mg/dL. The US mostly reports glucose in mg/dL, while the UK, Canada and Australia use mmol/L. The factor applies only to glucose; cholesterol and other substances have their own factors.
For a fasting test, ADA classes below 100 mg/dL (5.6 mmol/L) as normal, 100–125 mg/dL (5.6–6.9 mmol/L) as prediabetes and 126 mg/dL (7.0 mmol/L) or more, confirmed by repeat testing, as diabetes. Two hours into a 75 g glucose tolerance test the cut-offs are 140 and 200 mg/dL (7.8 and 11.1 mmol/L). For people treated for diabetes, ADA calls a reading below 70 mg/dL (3.9 mmol/L) level 1 hypoglycaemia and below 54 mg/dL (3.0 mmol/L) level 2.
It corresponds to an estimated average glucose of 154 mg/dL (8.6 mmol/L) over roughly the previous three months, by the ADAG equation 28.7 × 7 − 46.7, and to 53 mmol/mol in IFCC units. ADA's diagnostic threshold for diabetes is 6.5 % (48 mmol/mol), and below 7 % is the goal ADA suggests for many non-pregnant adults with diabetes, adjusted to the individual.
From 5.7 % to below 6.5 % (39 to 47 mmol/mol) in the ADA criteria, with 6.5 % (48 mmol/mol) or higher, confirmed, in the diabetes range. By the ADAG equation, 5.7 % corresponds to an average glucose of 117 mg/dL (6.5 mmol/L) and 6.5 % to 140 mg/dL (7.8 mmol/L). HbA1c can mislead in anaemia, pregnancy, after blood loss or transfusion, and with some haemoglobin variants.
La précision dépend de vos données et des hypothèses de la méthode. Le calcul décimal utilise 50 chiffres significatifs, mais les estimations, méthodes numériques et données sources peuvent être moins précises ; l’arrondi affiché ne supprime pas ces limites. Exemples résolus vérifiés à partir de sources indépendantes : 7. Par exemple, « Boundary: 100 mg/dL → mmol/L » est vérifié à l’aide de Python 3.8 decimal: 100 / 18.016 = 5.5506; ADA fasting 100–125 mg/dL is prediabetes.
Nathan DM et al. Translating the A1C assay into estimated average glucose values. Diabetes Care 2008;31(8):1473–1478; NGSP — HbA1c and estimated average glucose (eAG) table; NGSP — IFCC standardization of HbA1c (master equation); American Diabetes Association. Standards of Care in Diabetes—2025, sections 2 (diagnosis) and 6 (glycemic goals and hypoglycemia). Diabetes Care 2025;48(Suppl 1).
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