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 target shifts higher, and the right number for you depends on your age, health, and other factors.
What A1C Ranges Mean
A1C measures how much sugar has attached to your red blood cells’ hemoglobin, the protein that carries oxygen. Since red blood cells live about three months, the test captures a rolling average of your blood sugar rather than a single snapshot. The ranges break down into three categories:
- 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 obvious symptoms like excessive thirst, frequent urination, or unexplained weight loss.
What Each Percentage Translates To
A1C percentages can feel abstract. Converting them to estimated average blood sugar in mg/dL makes the numbers more concrete:
- A1C of 5%: average blood sugar around 97 mg/dL
- A1C of 6%: around 126 mg/dL
- A1C of 7%: around 154 mg/dL
- A1C of 8%: around 183 mg/dL
- A1C of 9%: around 212 mg/dL
- A1C of 10%: around 240 mg/dL
The formula behind this conversion is straightforward: multiply your A1C by 28.7, then subtract 46.7. Your lab report may list this as “eAG” or “estimated average glucose” alongside your A1C result.
Targets If You Have Diabetes
The American Diabetes Association recommends an A1C below 7% for most adults with diabetes. That corresponds to an average blood sugar of about 154 mg/dL. But the ADA is clear that there’s no one-size-fits-all target, and your goal may be higher or lower depending on your situation.
A younger person who was recently diagnosed and has no complications might aim for something closer to 6.5%. Someone who has had diabetes for decades, takes multiple medications, or has experienced dangerous drops in blood sugar may be better served by a slightly higher target that reduces the risk of those lows.
Targets for Children and Teens
For children and adolescents with type 1 diabetes, the ADA recommends that A1C goals be individualized. A target below 7% is appropriate for many kids, though the number gets adjusted based on the child’s age, ability to recognize low blood sugar, and how much support they have managing their diabetes day to day.
Targets for Older Adults
Guidelines loosen for older adults, especially those managing several health conditions at once. For frail older adults or those with a life expectancy under 10 years, an A1C of 8% or below is a reasonable goal. For people in poor overall health, with severe conditions or cognitive decline, the target may stretch to 8.5%, which translates to an average blood sugar of about 200 mg/dL. The priority at this stage shifts toward avoiding dangerously low blood sugar episodes and preserving quality of life rather than hitting a tight number.
Targets During Pregnancy
Pregnancy calls for tighter control. If you have diabetes and are planning to conceive, the recommendation is to get your A1C below 7% before becoming pregnant to reduce the risk of complications for the baby. Once pregnant, the target drops to below 6%, as long as reaching that level doesn’t cause frequent episodes of low blood sugar. Pregnancy naturally changes red blood cell turnover in ways that lower A1C readings, so the test behaves slightly differently during this time.
How Often to Get Tested
If you’re being treated for diabetes and your blood sugar has been stable at your target, testing every six months is typically sufficient. If your levels aren’t yet stable, or if you’ve recently changed medications or made significant lifestyle changes, testing every three months gives your care team a clearer picture. More frequent testing may also make sense for children with type 1 diabetes and for anyone planning pregnancy.
When A1C Results Can Be Misleading
Several conditions can push your A1C reading higher or lower than your actual blood sugar control would suggest. Because the test depends on hemoglobin inside red blood cells, anything that changes how long those cells survive or how hemoglobin behaves will skew the result.
Iron deficiency anemia artificially raises A1C, which is especially relevant in late pregnancy even for people without diabetes. On the other end, conditions that shorten the lifespan of red blood cells, like hemolytic anemia or recovery from significant blood loss, make A1C appear falsely low because the cells haven’t been around long enough to accumulate sugar.
Genetic hemoglobin variants, including sickle cell trait and hemoglobin C trait, can also interfere with certain testing methods. If you carry one of these variants, your provider may need to use an alternative lab method or rely on direct blood sugar monitoring instead. Chronic kidney disease adds another layer of complexity: the combination of altered hemoglobin, anemia, and sometimes blood transfusions makes A1C unreliable for many dialysis patients.
If any of these conditions apply to you, a glycated albumin test or regular glucose monitoring may give a more accurate picture of your blood sugar control than A1C alone.