HbA1c ⟷ Average Glucose

Q: How do you convert HbA1c to average glucose?

Use the ADAG formula: average glucose (mg/dL) = 28.7 × HbA1c(%) − 46.7. For example, an HbA1c of 7% is about 154 mg/dL. For mmol/L, divide by 18.0182.

Q: What is the difference between HbA1c in % and mmol/mol?

They are two units of the same measurement. % is the DCCT/NGSP scale; mmol/mol is the IFCC scale used on many lab reports. Convert with mmol/mol = 10.929 × (% − 2.15): 7.0% ≈ 53 mmol/mol.

Q: Does estimated average glucose replace self-monitoring?

No. eAG is estimated from HbA1c to compare it with meter readings; it does not replace blood glucose measurements or your doctor's advice.

Convert HbA1c (%) ⟷ mmol/mol ⟷ average glucose (eAG)

Reviewed by the Nutricity editorial teamLast updated: July 3, 2026

Converter

Quick answer

Estimated average glucose (eAG) comes from HbA1c via the ADAG formula: eAG (mg/dL) = 28.7 × HbA1c(%) − 46.7. An HbA1c of 7% corresponds to about 154 mg/dL (8.6 mmol/L) and 53 mmol/mol in IFCC units.

HbA1c (%)	HbA1c (mmol/mol)	eAG (mg/dL)	eAG (mmol/L)
6.0	42	125	7.0
7.0	53	154	8.6
8.0	64	183	10.2
9.0	75	212	11.7
10.0	86	240	13.3

How it is calculated

The relationship between HbA1c and average glucose comes from the ADAG study (Nathan et al., 2008), which correlated HbA1c with continuously measured average glucose:

eAG (mg/dL) = 28.7 × HbA1c(%) − 46.7

The mmol/L value is obtained by dividing by 18.0182. Converting between % (DCCT/NGSP) and mmol/mol (IFCC) uses the NGSP-IFCC master equation: mmol/mol = 10.929 × (HbA1c% − 2.15).

% (DCCT) and mmol/mol (IFCC) units

Many labs report HbA1c in mmol/mol (IFCC), while many reference values are in % (DCCT). They are two scales of the same measurement: 6.0% ≈ 42 mmol/mol, 6.5% ≈ 48 mmol/mol, 7.0% ≈ 53 mmol/mol. This tool converts both ways.

How to interpret the value

As a guide (diabetes diagnostic criteria):

HbA1c	Interpretation
< 5.7% (< 39 mmol/mol)	Normal
5.7–6.4% (39–46 mmol/mol)	Prediabetes
≥ 6.5% (≥ 48 mmol/mol)	Consistent with diabetes

Estimated average glucose helps compare HbA1c with meter readings but does not replace them. To explore glucose metabolism see the HOMA-IR index and the TyG index; for cardiovascular risk see LDL cholesterol.

Disclaimer

This tool is for information only and does not replace medical advice. Diagnosis and management of diabetes are the doctor's role, interpreting HbA1c together with other tests and the clinical picture.

TyG IndexTriglyceride-glucose index for insulin resistance

LDL CholesterolCalculate the LDL Cholesterol

Frequently asked questions

How do you convert HbA1c to average glucose?

Use the ADAG formula: average glucose (mg/dL) = 28.7 × HbA1c(%) − 46.7. For example, an HbA1c of 7% is about 154 mg/dL. For mmol/L, divide by 18.0182.

What is the difference between HbA1c in % and mmol/mol?