A normal A1C level is below 5.7%. This number represents your average blood sugar over the past two to three months, expressed as a percentage. If you have diabetes, the general target is below 7%, though your ideal number depends on your age, health history, and other factors.
What A1C Ranges Mean
The A1C test measures how much sugar has attached to your red blood cells over their lifespan (about three months). A higher percentage means your blood sugar has been running higher on average. Three standard ranges are used for diagnosis:
- Normal: below 5.7%
- Prediabetes: 5.7% to 6.4%
- Diabetes: 6.5% or above
A single test result in the diabetes range typically needs to be confirmed with a second test, unless you already have clear symptoms like excessive thirst, frequent urination, or unexplained weight loss.
How A1C Translates to Daily Blood Sugar
The percentage can feel abstract, so it helps to know what it means in terms of the blood sugar numbers you’d see on a glucose meter. The conversion follows a simple formula: each A1C percentage corresponds to an estimated average glucose (eAG) in mg/dL.
- 6%: ~126 mg/dL
- 6.5%: ~140 mg/dL
- 7%: ~154 mg/dL
- 8%: ~183 mg/dL
- 9%: ~212 mg/dL
- 10%: ~240 mg/dL
So if your A1C is 7%, your blood sugar has been averaging around 154 mg/dL over the past few months. That gives you a much more intuitive sense of how well your glucose is being managed day to day.
Targets if You Have Diabetes
For most nonpregnant adults with diabetes, the American Diabetes Association recommends an A1C below 7%. That target has been shown to significantly reduce the risk of complications like nerve damage, kidney disease, and vision problems.
Some people can safely aim lower. If you were recently diagnosed, are otherwise healthy, and can manage your blood sugar without frequent lows (hypoglycemia), a target below 6.5% may be reasonable. This is especially true if you’re younger and have decades ahead during which complications could develop.
Others benefit from a less aggressive target. An A1C below 8% is often more appropriate if you have a long history of diabetes, other serious health conditions, a history of severe low blood sugar episodes, or limited ability to manage a complex treatment routine. For people over 80 or those with limited life expectancy, the priority shifts to simply preventing the symptoms that come with very high blood sugar, like fatigue, blurred vision, and dehydration, rather than hitting a specific number.
The key factors that shape your personal target include how long you’ve had diabetes, your age, your risk of hypoglycemia, other medical conditions, and your own preferences about treatment intensity.
Targets During Pregnancy
Blood sugar control matters even more during pregnancy because elevated glucose increases the risk of complications for both the mother and baby, including preeclampsia, preterm delivery, and the baby growing unusually large.
Before conception, the goal is to get A1C below 6.5% to reduce the risk of birth defects and other early complications. During pregnancy itself, the ideal target drops to below 6%, as long as that level can be reached without frequent episodes of low blood sugar. If keeping it that low causes dangerous dips in glucose, the target may be relaxed to below 7%. Low blood sugar during pregnancy carries its own risks, including potentially lower birth weight, so the goal is always a balance between tight control and safety.
Targets for Children and Teens
Children and adolescents with type 1 diabetes now have more ambitious A1C goals than in the past, thanks to technology like continuous glucose monitors and automated insulin pumps. The International Society for Pediatric and Adolescent Diabetes recommends an A1C of 6.5% or below for kids who have access to these tools and can reach that level safely.
For children without access to advanced technology, or when pursuing a lower target would create too much stress and reduce quality of life, the recommended goal is 7% or below. Beyond A1C alone, guidelines also suggest that children spend more than 70% of their day with blood sugar between 70 and 180 mg/dL, with less than 4% of time spent below 70 mg/dL.
What a Prediabetes Result Means
An A1C between 5.7% and 6.4% places you in the prediabetes range, which means your blood sugar is higher than normal but not yet high enough for a diabetes diagnosis. This is not a wait-and-see situation. Prediabetes is the stage where lifestyle changes have the most dramatic effect. Losing 5% to 7% of your body weight through dietary changes and regular physical activity can significantly delay or prevent the progression to type 2 diabetes.
If your A1C is in this range, it’s worth knowing that the higher end (closer to 6.4%) carries more risk than the lower end. A result of 6.3% represents a meaningfully different situation than 5.8%, even though both fall under the same label.
When A1C Results Can Be Misleading
The A1C test measures sugar attached to red blood cells, so anything that changes your red blood cells can throw off the result. Conditions that affect the lifespan or turnover of red blood cells, like iron deficiency anemia, sickle cell trait, significant blood loss, or recent blood transfusions, can produce A1C readings that don’t accurately reflect your true average blood sugar. Kidney disease and certain medications can also skew results.
If you have any of these conditions, your provider may rely more on direct blood sugar testing or a continuous glucose monitor to assess your control rather than trusting A1C alone.
How Often to Get Tested
If you have diabetes and your blood sugar is stable at your target, testing at least twice a year is the standard recommendation. If your treatment has recently changed, you’re not meeting your goals, or your medications were adjusted, more frequent testing (typically every three months) helps you and your provider see whether the changes are working. For people without diabetes, A1C is often checked as part of routine screening, especially after age 45 or if you have risk factors like excess weight, a family history of diabetes, or a sedentary lifestyle.