A hemoglobin A1c below 5.7% is considered normal for people without diabetes. If you have diabetes, the general target is below 7%, though your ideal number depends on your age, health, and specific circumstances. The A1c test measures your average blood sugar over the past two to three months by looking at how much sugar has attached to your red blood cells.
The Three Diagnostic Ranges
A1c results fall into three categories:
- Normal: below 5.7%
- Prediabetes: 5.7% to 6.4%
- Diabetes: 6.5% or above
These cutoffs come from the National Institute of Diabetes and Digestive and Kidney Diseases and are used across most clinical guidelines. A single A1c of 6.5% or higher typically needs to be confirmed with a second test before a diabetes diagnosis is made, unless you already have clear symptoms like excessive thirst, frequent urination, or unexplained weight loss.
If your result lands in the prediabetes range, that’s not a waiting room for diabetes. It’s an early signal that your body is starting to struggle with blood sugar regulation. Many people in this range can bring their numbers back to normal through changes in diet, physical activity, and weight management.
What Each A1c Percentage Means in Daily Terms
A1c percentages can feel abstract. What helps is translating them into estimated average glucose, the number you’d see on a blood sugar meter. Here’s how they map:
- A1c 5.0%: average blood sugar of about 97 mg/dL
- A1c 6.0%: about 126 mg/dL
- A1c 7.0%: about 154 mg/dL
- A1c 8.0%: about 183 mg/dL
- A1c 9.0%: about 212 mg/dL
- A1c 10.0%: about 240 mg/dL
Each full percentage point on the A1c scale corresponds to roughly a 28–29 mg/dL change in average blood sugar. So the difference between an A1c of 7% and 8% isn’t small. It represents your blood sugar running about 30 mg/dL higher on average, day after day, for months.
The Standard Target for Adults With Diabetes
For most non-pregnant adults with diabetes, the recommended goal is an A1c below 7%. This target balances long-term protection against complications (nerve damage, kidney disease, vision problems) with a realistic, sustainable level of blood sugar control. It’s the benchmark used in the American Diabetes Association’s 2024 standards of care.
That said, 7% is a starting point, not a rigid rule. Some people benefit from tighter or looser targets depending on their situation.
A tighter goal of below 6.5% may make sense if you were recently diagnosed, you’re relatively young, you manage your blood sugar without episodes of dangerously low blood sugar (hypoglycemia), and you don’t have significant complications yet. Getting closer to the normal range early in the disease can pay off over decades.
A more relaxed goal of below 8% is often appropriate if you have a history of severe low blood sugar episodes, advanced diabetes complications, multiple other health conditions, or a limited life expectancy. In these situations, pushing for a lower number can actually cause more harm than good. Hypoglycemia in particular is dangerous, especially for older adults, and aggressively lowering blood sugar increases that risk.
Targets for Older Adults
Age alone doesn’t change your A1c goal, but the health issues that come with aging often do. For older adults with significant medical conditions, an A1c of 8% or below is a reasonable target. The priority shifts from preventing complications that develop over 10 to 20 years toward avoiding the immediate dangers of low blood sugar, which can cause falls, confusion, and hospitalization.
For older adults in poor health, with severe conditions or cognitive and functional limitations, the target may be even more relaxed, up to 8.5%. At this stage, the focus is on quality of life: preventing symptoms of very high blood sugar (like extreme thirst, fatigue, and frequent infections) while staying well clear of hypoglycemia. It’s worth noting that a higher A1c goal doesn’t automatically protect against low blood sugar. The medications used and how they’re managed matters just as much as the number you’re aiming for.
Targets During Pregnancy
Pregnancy raises the stakes considerably. High blood sugar during pregnancy increases the risk of birth defects, preeclampsia, and complications during delivery. If you have diabetes and are planning to become pregnant, most guidelines recommend getting your A1c to 6.5% or below before conception. During pregnancy itself, the target tightens further to below 6%, reflecting the need for especially stable blood sugar during fetal development.
These are among the most aggressive A1c goals in any clinical setting, and reaching them usually requires close monitoring with frequent blood sugar checks or a continuous glucose monitor.
Targets for Children and Teens
For children with type 1 diabetes, the A1c goal is generally 7%, the same as for adults. The one notable exception is very young children who can’t yet recognize or communicate symptoms of low blood sugar. For these kids, a slightly higher target may be used to build in a safety margin against hypoglycemia, which they can’t alert a parent or caregiver to on their own.
How Often to Test
If you have diabetes, you should get an A1c test at least twice a year when your blood sugar is stable and you’re meeting your goals. If your treatment has recently changed, or your A1c is above target, testing every three months gives you and your care team faster feedback on whether adjustments are working. Since the test reflects a two-to-three-month average, testing more frequently than every three months doesn’t add useful information.
For people without diabetes, A1c is typically checked as part of routine screening, especially after age 35 or if you have risk factors like a family history of diabetes, obesity, or a history of gestational diabetes.
When A1c Results Can Be Misleading
The A1c test works by measuring sugar attached to hemoglobin in your red blood cells. Anything that changes your red blood cells or hemoglobin can throw off the result. Iron-deficiency anemia, for example, tends to falsely raise A1c because your red blood cells live longer than usual. Conditions that shorten red blood cell lifespan, like sickle cell trait or certain other hemoglobin variants, can falsely lower it.
Kidney disease, heavy bleeding, recent blood transfusions, and even pregnancy (due to changes in blood volume) can also affect accuracy. If your A1c doesn’t match what your daily blood sugar readings suggest, one of these factors may be at play, and your doctor may use a fructosamine test or rely more heavily on fingerstick or continuous glucose monitor data instead.