A normal A1C is below 5.7%. If you have diabetes, most guidelines recommend keeping your A1C under 7%, though your personal target depends on your age, health, and risk of low blood sugar episodes. The A1C test measures your average blood sugar over the past two to three months, giving you a bigger picture than any single finger-stick reading can.
A1C Ranges for Diagnosis
The standard cutoffs used to diagnose blood sugar problems are straightforward:
- Normal: below 5.7%
- Prediabetes: 5.7% to 6.4%
- Diabetes: 6.5% or above
These numbers come from the CDC and are used across most clinical settings. A result in the prediabetes range means your blood sugar is higher than it should be but hasn’t crossed the diabetes threshold yet. At this stage, lifestyle changes like diet adjustments and regular exercise can often bring your number back below 5.7%.
Targets If You Have Diabetes
Once you have a diabetes diagnosis, the goal shifts from “normal” to “well-managed.” For most adults with type 2 diabetes, the standard target is an A1C under 7%. The American Diabetes Association considers under 6.5% a reasonable goal for people who can reach it safely, without frequent drops in blood sugar or a heavy burden on daily life.
But these aren’t one-size-fits-all numbers. Your ideal target depends on several factors, and for some people, a higher A1C is actually the safer choice.
A target of under 8%, or even up to 8.5% to 9%, may be more appropriate if you have a history of severe low blood sugar episodes, advanced kidney or heart disease, limited life expectancy, or if you’ve had diabetes for many years and tighter control has proven difficult despite medication and monitoring. Pushing for a lower number in these situations can increase the risk of dangerous blood sugar crashes, which in older or frailer adults can lead to falls, confusion, and hospitalization. The VA and Department of Defense use a structured approach: someone with more than 10 years of life expectancy and no major complications aims lower, while someone with serious conditions like severe kidney disease, recent stroke, or advanced cardiovascular disease is given a higher target of 8% to 9%.
Targets for Children and Teens
Pediatric guidelines have become more ambitious in recent years. The International Society for Pediatric and Adolescent Diabetes recommends an A1C of 6.5% or below for children and adolescents who have access to advanced diabetes technology like continuous glucose monitors and automated insulin delivery systems. For those without these tools, the recommended target is 7% or below.
The ADA similarly supports a target under 6.5% for young people when it can be achieved without significant low blood sugar risk or negative impacts on quality of life. Countries like Sweden and the UK have also moved their pediatric targets down to 6.5%. The shift reflects how much easier it has become for kids and teens to stay in range with newer technology.
Targets During Pregnancy
Pregnancy calls for tighter blood sugar control because even moderately elevated glucose levels can affect the baby’s development. If you have diabetes and are planning a pregnancy, the recommended A1C is below 6.5% before conception. If your A1C is above 10%, guidelines from the UK’s National Institute for Health and Care Excellence strongly advise waiting to conceive until that number comes down, because the risk of serious complications rises sharply at that level.
During pregnancy itself, your care team will likely rely more on daily blood sugar checks than on A1C alone, since A1C reflects a two-to-three-month average and pregnancy demands more real-time adjustments.
What Your A1C Means in Daily Blood Sugar Terms
One of the most useful things about A1C is that it translates directly to an estimated average glucose, the number you’d see on a blood sugar meter. The conversion uses a simple formula, and here’s what common A1C values look like in everyday terms:
- A1C of 6%: average blood sugar around 126 mg/dL
- A1C of 6.5%: around 140 mg/dL
- A1C of 7%: around 154 mg/dL
- A1C of 7.5%: around 169 mg/dL
- A1C of 8%: around 183 mg/dL
- A1C of 9%: around 212 mg/dL
- A1C of 10%: around 240 mg/dL
So the difference between an A1C of 7% and 8% is roughly 30 mg/dL in your day-to-day average. That’s a meaningful gap over months, which is why even small A1C improvements can reduce the risk of complications like nerve damage and vision problems.
When Your A1C Might Not Be Accurate
The A1C test measures how much sugar has attached to your red blood cells over their lifespan, which is typically about three months. Anything that changes how long your red blood cells live, or how they’re structured, can throw off the result.
Conditions that shorten the life of red blood cells, like hemolytic anemia or recovery from significant blood loss, will falsely lower your A1C. Your blood sugar could be higher than the test suggests because the red blood cells haven’t been around long enough to accumulate sugar. People with sickle cell disease or sickle cell trait also need to interpret A1C results cautiously, since the abnormal hemoglobin and increased red cell turnover make the test unreliable.
On the other hand, iron deficiency anemia pushes A1C readings falsely higher. This is especially relevant during late pregnancy, when iron deficiency is common and can inflate A1C even in someone without diabetes. Chronic kidney failure can also distort results, with recent evidence suggesting A1C tends to underestimate blood sugar in people on dialysis. If any of these conditions apply to you, your doctor may use alternative tests like fructosamine or glycated albumin to get a more accurate picture.
How Often to Get Tested
If you have diabetes, testing at least twice a year is the baseline recommendation for people whose blood sugar is stable and meeting their target. If you’ve recently changed medications, aren’t hitting your goal, or your doctor is adjusting your treatment plan, testing every three months is more typical. Since the test reflects a rolling two-to-three-month average, testing more frequently than every three months won’t give you much new information.
For people without diabetes who had a normal result, repeat testing every three years is generally sufficient unless risk factors like weight gain, family history, or a previous prediabetes reading suggest closer monitoring.