A1C Calculator

Calculate A1C from Average Blood Sugar

Average Blood Sugar Level

Time Period

Diabetes Status

Quick Examples

A1C Analysis

Your Estimated A1C

Target A1C Ranges

Normal: <5.7%

Prediabetes: 5.7% - 6.4%

Diabetes: ≥6.5%

Well Controlled: <7.0%

Recommendations

Conversion Chart

A1C %

→

Avg Blood Sugar

5.0%

→

97 mg/dL

6.0%

→

126 mg/dL

7.0%

→

154 mg/dL

8.0%

→

183 mg/dL

9.0%

→

212 mg/dL

Enter your average blood sugar level above to calculate A1C

Medical Disclaimer

This calculator is for informational purposes only and should not be used as medical advice.

• The A1C estimate provided is based on mathematical formulas and general guidelines

• Actual A1C levels may vary due to individual factors and testing methods

• This tool is not a substitute for professional medical advice, diagnosis, or treatment

• Always consult with your healthcare provider for accurate A1C testing and interpretation

• Laboratory A1C testing is the gold standard for diabetes management

• Never make changes to your diabetes management plan without consulting your healthcare team

About A1C Calculator

This A1C calculator estimates your hemoglobin A1C percentage based on your average blood sugar levels over a specified time period. A1C reflects your average blood glucose control over the past 2-3 months.

What is A1C?

Hemoglobin A1C (HbA1c) is a blood test that measures the percentage of hemoglobin that is coated with sugar. It provides an average of your blood sugar levels over the past 2-3 months, giving healthcare providers insight into your long-term glucose control.

A1C Formula:

The calculator uses the ADA (American Diabetes Association) formula:
A1C = (Average Blood Sugar + 46.7) ÷ 28.7
This formula converts average blood sugar in mg/dL to A1C percentage.

A1C Target Ranges:

Normal (No Diabetes):

A1C: <5.7%
Average Blood Sugar: <117 mg/dL

Prediabetes:

A1C: 5.7% - 6.4%
Average Blood Sugar: 117-137 mg/dL

Diabetes:

A1C: ≥6.5%
Average Blood Sugar: ≥137 mg/dL

Well Controlled Diabetes:

A1C: <7.0%
Average Blood Sugar: <154 mg/dL

Important Notes:

A1C testing should be done every 3-6 months for diabetes management
Individual A1C targets may vary based on age, health conditions, and other factors
Some conditions (anemia, kidney disease) can affect A1C accuracy
Laboratory A1C testing is more accurate than estimates from blood sugar averages
Work with your healthcare team to set personalized A1C goals
Regular blood sugar monitoring helps track daily control between A1C tests