Written by Dr. Albana Greca, MD, MMedSc, Family Physician
Medically reviewed by Dr. Ruden Cakoni, MD, Endocrinologist
Last medically reviewed: July 2026
A good A1C level is one that keeps your risk of diabetes complications low without causing frequent or severe hypoglycemia. For many nonpregnant adults with diabetes, a common goal is below 7%. However, your safest target may be lower or higher depending on your age, treatment, pregnancy status, overall health, and risk of low blood sugar.
I encourage my patients to treat A1C as one part of the complete picture. Glucose patterns, continuous glucose monitor data, symptoms, medication side effects, kidney and heart health, and quality of life also matter.
Quick Answer
For someone without diabetes, a normal A1C is below 5.7%. An A1C of 5.7–6.4% is in the prediabetes range, while 6.5% or higher is in the diabetes range when confirmed appropriately. For many nonpregnant adults who already have diabetes, an A1C below 7% is a common treatment goal. Your personal target may differ, and a lower number is not automatically better if it is achieved at the cost of hypoglycemia or excessive treatment burden.
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A1C—also called hemoglobin A1C, HbA1c, glycated hemoglobin, or glycohemoglobin—is a blood test that estimates your average glucose exposure over approximately the previous two to three months.
Glucose naturally attaches to hemoglobin, the oxygen-carrying protein in red blood cells. When blood glucose remains higher, a greater percentage of hemoglobin becomes glycated, producing a higher A1C result.
Your most recent weeks usually influence the result more than the earliest weeks in the three-month period. You do not normally need to fast before an A1C test.
A1C does not show every high or low reading. Two people can have the same A1C but very different daily glucose patterns. One may have relatively stable glucose, while another alternates between significant highs and lows.
| A1C result | Diagnostic category | What it means |
|---|---|---|
| Below 5.7% | Normal range | Does not indicate prediabetes or diabetes by A1C criteria |
| 5.7–6.4% | Prediabetes | Higher risk of developing type 2 diabetes |
| 6.5% or higher | Diabetes range | Usually requires confirmation unless clear symptoms and marked hyperglycemia are present |
These ranges are used for diagnosis in nonpregnant adults. They are not the same as treatment targets for someone who has already been diagnosed with diabetes.
If you do not have clear symptoms, an A1C result in the diabetes range normally needs confirmation on a different day with another A1C or a different diagnostic test. A laboratory method appropriate for diagnosis should be used.
An A1C test should not be used by itself to diagnose type 1 diabetes, gestational diabetes, or certain other forms of diabetes.
Estimated average glucose, or eAG, translates an A1C percentage into the same units commonly used by glucose meters. It is an estimate—not a prediction of what every individual reading should be.
| A1C | eAG mg/dL | eAG mmol/L |
|---|---|---|
| 5% | 97 | 5.4 |
| 6% | 126 | 7.0 |
| 7% | 154 | 8.6 |
| 8% | 183 | 10.2 |
| 9% | 212 | 11.8 |
| 10% | 240 | 13.4 |
| 11% | 269 | 14.9 |
| 12% | 298 | 16.5 |
For a personalized conversion, use our A1C and estimated average glucose calculator.
For many nonpregnant adults with diabetes, the American Diabetes Association recommends an A1C goal below 7% when this can be achieved without severe hypoglycemia, frequent hypoglycemia, or an unacceptable treatment burden.
A lower goal, such as below 6.5%, may be appropriate for selected people who:
A less stringent goal, such as below 8%, may be safer for some people with:
Important: “As close to normal as possible” is not a safe goal for everyone. An A1C of 6.2% achieved without hypoglycemia may be appropriate for one person, while an A1C of 7.5% may be safer and more appropriate for another.
A low A1C is not automatically dangerous, particularly when achieved through nutritious eating, physical activity, weight management, or medicines that rarely cause hypoglycemia.
However, a low A1C may be concerning if it reflects frequent glucose readings below 70 mg/dL, severe hypoglycemia, overtreatment, poor food intake, frailty, or a medical condition that makes the A1C falsely low.
If you use insulin or a sulfonylurea, I pay particular attention to your low-glucose episodes rather than judging treatment success only by the A1C.
Severe or frequent hypoglycemia is a reason to review and possibly simplify or reduce treatment—even when the A1C appears “excellent.”
Age alone does not determine the correct target. I also consider physical function, memory, frailty, other illnesses, life expectancy, available support, and risk of hypoglycemia.
| General health status | Example A1C goal | Main consideration |
|---|---|---|
| Healthy, independent, and cognitively intact | Below 7–7.5% | Lower goals may provide long-term benefit when safely achievable |
| Complex health, frailty, or cognitive or functional limitations | Often below 8% | Prioritize safety and avoidance of hypoglycemia |
| Very complex or poor health | Avoid relying only on A1C | Focus on avoiding hypoglycemia and symptomatic high glucose |
These are examples rather than automatic prescriptions. An individualized goal should be agreed upon with the healthcare team.
Pregnancy requires different and generally tighter glucose goals. Ideally, the A1C goal during pregnancy is below 6% when this can be achieved without significant hypoglycemia. The goal may be relaxed to below 7% when necessary to prevent low blood sugar.
A1C is naturally somewhat lower during pregnancy because red blood cells turn over more quickly. It also may not show important after-meal glucose elevations. For this reason, fasting and post-meal glucose monitoring—and continuous glucose monitoring when appropriate—are especially important.
Do not use the nonpregnant diagnostic ranges or treatment goals to manage gestational diabetes without guidance from your obstetric and diabetes teams.
Long-term studies have shown that improving glucose management can reduce the risk of microvascular complications involving the eyes, kidneys, and nerves.
However, diabetes care is not only about A1C. Modern treatment also aims to protect your heart and kidneys, manage blood pressure and cholesterol, support a healthy weight, prevent hypoglycemia, and preserve quality of life.
Two people with the same A1C may therefore need different medicines based on heart disease, kidney disease, weight goals, side effects, affordability, and personal preferences.
A1C depends on the lifespan and characteristics of your red blood cells. A result may be falsely high or low when a condition changes red blood cell survival or interferes with the test.
Situations that may affect A1C include:
If your A1C does not match your home glucose or CGM readings, tell your doctor. The laboratory method, medical conditions, glucose patterns, and possible alternative tests may need to be reviewed.
Testing frequency should match your clinical situation.
Because A1C reflects several months, repeating it only a few days after a treatment change will not show the full effect.
One result above target does not mean you have failed. It tells us that your current plan may need review.
I recommend looking at:
A1C alone cannot identify when glucose is rising. Finger-stick testing or CGM data can reveal whether the main problem occurs overnight, in the morning, after meals, or throughout the day.
Our guide to blood sugar levels by time of day can help you interpret these patterns.
The right changes depend on your glucose patterns and treatment. Helpful steps may include:
Use my diabetic meal plan for practical meal-building guidance.
Do not lower glucose too aggressively on your own
If you use insulin or a medicine that can cause hypoglycemia, significant changes in food intake, exercise, or weight may alter your medication needs. Speak with your diabetes team rather than reducing or increasing treatment without a plan.
For many nonpregnant adults with diabetes, yes. An A1C of 7% is within the usual treatment target. Whether it is good for you depends on hypoglycemia, age, overall health, pregnancy, complications, treatment burden, and your agreed personal goal.
No. For someone who has not previously been diagnosed, 6.5% is at the threshold used to diagnose diabetes and normally requires confirmation. For someone already receiving diabetes treatment, 6.5% may represent excellent management when achieved safely.
An A1C of exactly 5.7% is at the beginning of the prediabetes range. It does not mean that diabetes is inevitable, but it is a reason to review risk factors and discuss follow-up testing.
Recent glucose levels influence A1C more strongly, so improvement may begin to appear within several weeks. The full effect of a sustained treatment change is generally evaluated after approximately three months.
Yes. High readings may be balanced by low readings, producing an average that looks acceptable. A1C may also be inaccurate in certain medical conditions. Review the pattern with your healthcare professional.
This information is for general education and does not replace individual medical advice, diagnosis, or treatment.