An ideal A1C for most adults is below 5.7%, which indicates normal blood sugar regulation over the previous two to three months. If you already have diabetes, the target shifts: below 7% is the goal for most nonpregnant adults, though your specific number depends on age, health status, and risk of blood sugar dropping too low.
The A1C test measures the percentage of your red blood cells that have sugar attached to them. Because red blood cells live about three months, the result gives a rolling average of your blood sugar rather than a single snapshot.
A1C Ranges: Normal, Prediabetes, and Diabetes
The standard classifications are straightforward:
- Normal: below 5.7%
- Prediabetes: 5.7% to 6.4%
- Diabetes: 6.5% or above
These cutoffs come from the CDC and the American Diabetes Association. A result in the prediabetes range means your blood sugar is higher than normal but not yet at the diabetes threshold. At this stage, lifestyle changes like losing 5 to 7 percent of your body weight and getting regular physical activity can often bring the number back down and delay or prevent a diabetes diagnosis.
To put these percentages in practical terms: an A1C of 7% translates to an estimated average blood glucose of about 154 mg/dL, while an A1C of 9% corresponds to roughly 212 mg/dL. If you’re used to checking your blood sugar with a finger stick or continuous glucose monitor, these conversions help you see how your daily readings connect to the bigger picture.
Targets for Adults With Diabetes
The 2025 ADA Standards of Care recommend an A1C below 7% for most nonpregnant adults with diabetes, as long as they’re not experiencing frequent or severe episodes of low blood sugar. That 7% target pairs with specific daily glucose goals: fasting blood sugar between 80 and 130 mg/dL and post-meal readings below 180 mg/dL.
Some people can safely aim lower. If you can maintain an A1C below 7% without your blood sugar dropping dangerously low, a tighter target (closer to 6.5%) may offer extra protection against complications. The key word is “safely.” Pushing too aggressively can lead to hypoglycemia, which causes shakiness, confusion, and in serious cases, loss of consciousness.
On the other end, less stringent goals may be appropriate for older adults, people with limited life expectancy, or anyone for whom the risks of tight blood sugar control outweigh the benefits. For these individuals, an A1C of 7.5% or even 8% can be a reasonable target.
Why Lowering A1C Matters
The connection between A1C and long-term complications is well established. In landmark clinical trials, intensive blood sugar management reduced the development of eye disease (retinopathy) by 76%, cut the need for laser eye treatment by 56%, lowered early kidney damage by 43%, and reduced nerve damage by 69%. These are dramatic reductions, and they illustrate why even small improvements in A1C translate into real protection.
Each percentage point matters. Moving from 9% to 8%, or from 8% to 7%, meaningfully lowers the strain that elevated blood sugar places on small blood vessels throughout your body, particularly in the eyes, kidneys, and nerves.
The Risks of Going Too Low
Counterintuitively, a very low A1C in someone with diabetes isn’t always a good sign. Research has identified a U-shaped relationship between A1C and mortality in older adults, meaning that both high and very low levels are associated with worse outcomes. This doesn’t mean a low A1C is inherently dangerous. The likely explanation is that frail, malnourished, or chronically ill individuals tend to have lower A1C readings not because of excellent blood sugar control but because of overall declining health, reduced food intake, and inflammation.
The practical takeaway: your A1C target should reflect your whole health picture, not just a single number in isolation.
Targets for Children and Adolescents
For children and teens with type 1 diabetes, the 2024 ADA standards recommend an A1C below 7% as appropriate for many young patients. More aggressive targets (below 6.5%) can be considered for kids who are able to achieve them without significant low blood sugar episodes, particularly during the “honeymoon phase” shortly after diagnosis when the pancreas still produces some insulin.
Less stringent goals apply when tighter control is harder to achieve safely. An A1C below 7.5% may be more realistic for children who can’t recognize or communicate symptoms of low blood sugar, who don’t have access to advanced insulin delivery technology, or who can’t check blood sugar frequently. For kids with a history of severe hypoglycemia, a target below 8% may be appropriate.
A1C Targets During Pregnancy
Pregnancy calls for tighter blood sugar control. Before conception, the recommended target is an A1C below 6.5% to reduce the risk of birth defects. During pregnancy itself, the ideal is below 6% if it can be achieved without significant hypoglycemia. Keeping A1C under 6% in the second and third trimesters is associated with the lowest risk of having an unusually large baby, preterm delivery, and preeclampsia.
If that target causes frequent low blood sugar, a goal below 7% is acceptable. The balance between tight control and avoiding hypoglycemia is especially important during pregnancy because low blood sugar affects both parent and baby.
When A1C Results Can Be Misleading
Because the A1C test depends on hemoglobin in red blood cells, anything that changes your red blood cells can skew the result. Iron deficiency anemia, for example, can falsely raise your A1C, while conditions that shorten red blood cell lifespan (like sickle cell disease) can produce misleadingly low readings.
The four most common hemoglobin variants that can interfere with A1C accuracy are hemoglobin S (sickle cell), hemoglobin E, hemoglobin C, and hemoglobin D. Significant kidney disease and liver failure can also alter red blood cell lifespan enough to distort results. If you have any of these conditions, your doctor may use alternative tests like fructosamine or a continuous glucose monitor to get a more accurate picture of your blood sugar control.
Even without these conditions, A1C represents an average. Two people with the same A1C of 7% could have very different daily patterns: one might have steady glucose levels throughout the day, while the other swings between high spikes and low crashes that happen to average out to the same number. This is why many clinicians now look at “time in range,” the percentage of each day your blood sugar stays between 70 and 180 mg/dL, as a complementary measure. A time in range above 70% is the recommended target for most nonpregnant adults using a continuous glucose monitor.