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It looks backward
A1C gives a longer-term view of blood glucose, unlike a single finger-stick reading that captures one moment.
Understand your numbers
A clearer way to think about your A1C.
Your A1C reflects your average blood glucose over roughly the past two to three months. Use this guide to explore the basics, estimate average glucose, and prepare better questions for your care team.
Educational content • Designed for quick, calm reference
Sample A1C result
6.4%
Estimated average glucose: 137 mg/dL
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Small steps add up ✦
Estimate average glucose
Enter an A1C percentage to see an estimated average glucose value. This is an estimate, and individual results can vary.
For example, enter 6.5 for an A1C of 6.5%.
Estimated average glucose
140 mg/dL
A1C and glucose readings do not tell the whole story. Review your result with a qualified healthcare professional, especially if you have symptoms or a new diagnosis.
The basics, without the jargon
A few helpful ideas to keep in mind when you see an A1C result on a lab report.
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Trends matter
One result is useful, but changes over time can give your care team more context about what is working.
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Context matters too
Medications, anemia, pregnancy, kidney disease, and other factors can affect how A1C is interpreted.
How A1C ranges are often discussed
These broad categories are commonly used for screening and discussion. Your personal goal may be different.
Below 5.7%Often described as typical range
5.7%–6.4%Often described as prediabetes range
6.5% or higherMay indicate diabetes range
Common questions
Quick answers to help you start a more informed conversation.
What does A1C measure?
A1C measures the percentage of hemoglobin with glucose attached to it. It is used as an indicator of average blood glucose over the preceding months.
Can I diagnose myself with an A1C calculator?
No. A calculator can help explain a number, but diagnosis requires appropriate testing and interpretation by a healthcare professional.
Why can my meter average differ from my A1C?
They measure glucose differently and may cover different time periods. Testing frequency, timing, and biological factors can all contribute to differences.
What should I do with a high or low result?
Contact your care team for personalized guidance. Seek urgent help for severe symptoms such as confusion, fainting, trouble breathing, or inability to keep fluids down.