HbA1c Converter

An HbA1c of 7 % (NGSP) is 53.0056 mmol/mol in IFCC units, corresponding to an estimated average glucose of about 154 mg/dL (8.6 mmol/L).

Given:

HbA1c % (NGSP/DCCT)HbA1c mmol/mol (IFCC)Average glucose (eAG)

HbA1c (%):

HbA1c (IFCC) =

53.00565 mmol/mol

Precision

Full answer, then cut to fewer decimals (not rounded):

53.00565 mmol/mol
53.0056 mmol/mol
53.005 mmol/mol
53.00 mmol/mol
53.0 mmol/mol

HbA1c (NGSP): 7 %
Estimated average glucose (eAG): 154.2 mg/dL
Estimated average glucose (eAG): 8.559248651 mmol/L

HbA1c conversion table
NGSP %	IFCC mmol/mol	eAG mg/dL	eAG mmol/L
5	31	97	5.4
5.5	37	111	6.2
5.7	39	117	6.5
6	42	125	7
6.5	48	140	7.8
7	53	154	8.6
7.5	58	169	9.4
8	64	183	10.2
9	75	212	11.7
10	86	240	13.3
11	97	269	14.9
12	108	298	16.5

Step-by-step solution

IFCC = (NGSP − 2.15) × 10.929 = (7 − 2.15) × 10.929 = 53.00565 mmol/mol
eAG = 28.7 × A1c − 46.7 = 28.7 × 7 − 46.7 = 154.2 mg/dL
eAG = 154.2 ÷ 18.0156 = 8.559248651 mmol/L

HbA1c Converter Formula

IFCC = (NGSP − 2.15) × 10.929, eAG = 28.7 × A1c − 46.7

NGSP in %, IFCC in mmol/mol, eAG estimated average glucose in mg/dL (ADAG study)

Worked Example

An HbA1c of 7 %:

IFCC = (NGSP − 2.15) × 10.929 = (7 − 2.15) × 10.929 = 53.00565 mmol/mol
eAG = 28.7 × A1c − 46.7 = 28.7 × 7 − 46.7 = 154.2 mg/dL
eAG = 154.2 ÷ 18.0156 = 8.559248651 mmol/L

Estimated average glucose (eAG): 154.2 mg/dL · Estimated average glucose (eAG): 8.559248651 mmol/L

HbA1c conversion table
NGSP %	IFCC mmol/mol	eAG mg/dL	eAG mmol/L
5	31	97	5.4
5.5	37	111	6.2
5.7	39	117	6.5
6	42	125	7
6.5	48	140	7.8
7	53	154	8.6
7.5	58	169	9.4
8	64	183	10.2
9	75	212	11.7
10	86	240	13.3
11	97	269	14.9
12	108	298	16.5

Rounding in reports

Labs round IFCC to whole numbers and NGSP to one decimal. Converting back and forth can shift the last digit, so 53 mmol/mol reads as 7.0 % even though the exact value is 7.009 %.

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Frequently asked questions

Why are there two HbA1c units?

The US and many countries report NGSP % (aligned with the DCCT trial); the UK, Europe and Australia report IFCC mmol/mol, a more specific SI-based method. The master equation links them.

What is estimated average glucose?

The average glucose level that matches an HbA1c, from the ADAG study: eAG (mg/dL) = 28.7 × A1c − 46.7. It is an average across many people, so individuals can differ.

Is this medical advice?

No. It converts units only; targets and interpretation belong with your healthcare professional.

Sources

IFCC Standardization of HbA1c: the NGSP–IFCC master equation, National Glycohemoglobin Standardization Program .
D. M. Nathan et al., “Translating the A1C Assay Into Estimated Average Glucose Values”, Diabetes Care 31 (8), 1473–1478, American Diabetes Association .

Last reviewed: 2026-10-15. Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.

Cite this page

APA

Scientific Converters. (2026, October 15). HbA1c Converter. Retrieved October 25, 2026, from https://scientificconverters.com/calculators/a1c-converter/

IEEE

Scientific Converters, "HbA1c Converter," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/calculators/a1c-converter/