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.

Full A1C Calculator | Complete Conversion Tool

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.

Full A1C Calculator

Complete conversion tool with advanced features, doctor mode, and detailed analysis

A1C Calculator

Convert between A1C%, eAG (mg/dL and mmol/L), and IFCC (mmol/mol)

Mode:

Input Type

A1C % Value

Important Notice: This tool is for educational purposes only and does not constitute medical advice. A1C values may be affected by pregnancy, anemia, hemolysis, kidney disease, and hemoglobin variants. Always consult with a healthcare provider for diagnosis and treatment decisions.

About This Calculator

This advanced A1C calculator provides comprehensive conversion between multiple units:

A1C % - Standard NGSP percentage used in the United States
eAG mg/dL - Estimated Average Glucose in milligrams per deciliter
eAG mmol/L - Estimated Average Glucose in millimoles per liter (International)
A1C mmol/mol - IFCC standard used in many countries

Features

Instant bidirectional conversion between all units
Doctor mode for clinical use with detailed interpretations
ADA classification with color-coded results
Print-friendly reports for patient records
Comprehensive interference factor warnings

Clinical Guidelines

The American Diabetes Association (ADA) recommends the following targets:

Most adults with diabetes: A1C <7% (53 mmol/mol)
Older adults or those with complications: A1C <8% (64 mmol/mol)
Children and adolescents: A1C <7.5% (58 mmol/mol)
Pregnancy: A1C <6.5% (48 mmol/mol) or lower if achievable

Important Considerations

A1C results should be interpreted carefully in the presence of:

Hemoglobinopathies (sickle cell, thalassemia)
Anemia or recent blood loss
Recent transfusions
Chronic kidney disease
Pregnancy (especially 2nd and 3rd trimester)
Certain medications affecting red blood cell turnover