A1C (glycated hemoglobin) reflects the average blood glucose levels over approximately 3 months. It's measured as a percentage of hemoglobin that is coated with sugar.

How to convert A1C to average glucose (eAG)?

eAG (mg/dL) = 28.7 × A1C(%) − 46.7. For example, an A1C of 7% equals approximately 154 mg/dL average glucose.

What are normal A1C ranges?

Normal: <5.7% | Prediabetes: 5.7-6.4% | Diabetes: ≥6.5%. These are ADA guidelines. Consult your healthcare provider for personalized targets.

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IFCC ↔ NGSP Converter

Q: What are normal A1C ranges?

Normal: <5.7% | Prediabetes: 5.7-6.4% | Diabetes: ≥6.5%. These are ADA guidelines. Consult your healthcare provider for personalized targets.

Convert between IFCC (mmol/mol) and NGSP (%) standards for A1C measurement

Bidirectional Converter

Enter a value in either field to convert instantly

NGSP (A1C %)

Standard used in USA, range: 3-20%

IFCC (mmol/mol)

International standard, range: 15-200 mmol/mol

Conversion Formula:

IFCC (mmol/mol) = 10.929 × (NGSP% − 2.15)

NGSP (%) = (IFCC mmol/mol / 10.929) + 2.15

Quick Reference Table

Common A1C values and their clinical interpretation

NGSP (%)	IFCC (mmol/mol)	Clinical Interpretation
4.0%	20	Below normal
5.0%	31	Normal
5.7%	39	Upper normal limit
6.0%	42	Prediabetes
6.5%	48	Diabetes threshold
7.0%	53	Common target
8.0%	64	Above target
9.0%	75	Poor control
10.0%	86	Very poor control

About NGSP

The National Glycohemoglobin Standardization Program (NGSP) standard reports A1C as a percentage of total hemoglobin.

Primarily used in: USA, Canada, Japan

Normal range: <5.7%

About IFCC

The International Federation of Clinical Chemistry (IFCC) standard reports A1C in mmol/mol units.

Primarily used in: Europe, Australia, Asia

Normal range: <39 mmol/mol

Note: Both NGSP and IFCC measure the same thing (glycated hemoglobin) but report it in different units. The relationship between them is linear and precisely defined. Always verify which standard your laboratory uses.