For most adults with diabetes, a good A1C is below 7%. That target, recommended by the American Diabetes Association, translates to an estimated average blood sugar of about 154 mg/dL over the previous two to three months. But “good” isn’t one number for everyone. Your ideal target depends on your age, how long you’ve had diabetes, your risk of low blood sugar episodes, and other health conditions you may be managing.
The Standard Targets
Two major professional organizations set slightly different goals. The American Diabetes Association recommends an A1C below 7% for most nonpregnant adults. The American Association of Clinical Endocrinology sets a tighter target of 6.5% or lower for people who can reach it safely, meaning those without serious concurrent illness and at low risk for hypoglycemia.
The difference matters in practice. If you’re relatively young, recently diagnosed, and managing your diabetes without frequent low blood sugar episodes, aiming for 6.5% is reasonable and may offer extra protection against complications. If reaching that number requires stacking multiple medications or causes repeated lows, the slightly higher target of under 7% is just as appropriate.
Why Lower A1C Matters for Complications
Every percentage point you drop your A1C reduces the risk of serious diabetes complications by a meaningful amount. For every 1% decrease in A1C, the risk of microvascular complications (damage to the small blood vessels in your eyes, kidneys, and nerves) drops by roughly 33% to 37%. That’s a substantial payoff. Going from an A1C of 9% down to 7% doesn’t just improve a number on a lab report; it significantly lowers your odds of vision loss, kidney disease, and nerve pain over the years ahead.
That said, pushing A1C as low as possible isn’t always better. The landmark ACCORD trial found that very aggressive blood sugar lowering in people already at high cardiovascular risk, especially when achieved through multiple medications, actually increased the risk of death from heart disease. The benefits of tight control have diminishing returns, and at some point the risks of hypoglycemia and medication burden outweigh the gains.
When a Higher Target Is the Right Target
Not everyone should chase a number below 7%. For certain groups, a higher A1C is not just acceptable but recommended.
Older adults with significant health problems are generally advised to aim for 8% or lower, with fasting blood sugars in the 160 to 170 mg/dL range. If you’re over 65 with multiple chronic conditions or a life expectancy under 10 years, tight blood sugar control carries real risks (dangerous lows, falls, medication side effects) without enough time to reap the long-term benefits of preventing complications.
For older adults in poor overall health, including those with cognitive decline or severe functional limitations, the goal may be even more relaxed, up to 8.5%. An A1C of 8.5% corresponds to an average blood sugar around 200 mg/dL. The priority shifts from prevention to quality of life: avoiding both the symptoms of very high blood sugar and the dangers of hypoglycemia.
People with a history of severe hypoglycemia or hypoglycemia unawareness (where you can’t feel your blood sugar dropping) also typically get a wider A1C range of 7% to 8%. The same applies to anyone with long-standing diabetes where tighter control has been persistently difficult to achieve despite consistent effort.
Targets for Children and Adolescents
For children and teens with type 1 diabetes, the International Society for Pediatric and Adolescent Diabetes recommends an A1C of 6.5% or lower when they have access to advanced technology like continuous glucose monitors and automated insulin delivery systems. These tools make tighter control safer by catching lows before they become dangerous. Without that technology, the recommended target is 7% or lower. In both cases, the goal should not come at the expense of quality of life or create excessive burden on the child and family.
What Your A1C Actually Measures
A1C reflects the percentage of your hemoglobin (a protein in red blood cells) that has glucose attached to it. Because red blood cells live for about two to three months, A1C captures a rolling average of your blood sugar over that window. An A1C of 7% corresponds to an estimated average glucose of about 154 mg/dL. At 9%, that average climbs to roughly 212 mg/dL.
This makes A1C useful as a big-picture snapshot, but it has blind spots. It won’t reveal dangerous swings between highs and lows that cancel each other out and produce a “normal” looking average. That’s where continuous glucose monitors add value: they track a metric called Time in Range, which measures what percentage of the day your blood sugar stays between 70 and 180 mg/dL. Research shows a strong correlation between Time in Range and A1C. Dropping your A1C from 7.5% to 7.0% corresponds to roughly a 5 to 6 percentage point improvement in Time in Range, depending on the device. If you wear a CGM, your care team may use both numbers together to get a fuller picture.
When A1C Results Can Be Misleading
Several conditions can push your A1C reading higher or lower than your actual blood sugar levels warrant. Severe anemia, kidney failure, liver disease, and blood disorders like sickle cell anemia or thalassemia all interfere with the test’s accuracy. Blood transfusions, significant blood loss, and certain medications (including some opioids and HIV treatments) can also skew results. Pregnancy, particularly early or late stages, affects readings as well.
If you have any of these conditions, your doctor may rely more heavily on direct blood sugar measurements or a fructosamine test, which reflects a shorter window of blood sugar control. A misleading A1C could lead to over- or under-treatment, so it’s worth flagging these factors if they apply to you.
Making Sense of Your Number
If your A1C is currently well above your target, it helps to think in increments rather than trying to hit 7% immediately. Even a 1% reduction delivers that 33% to 37% drop in microvascular complication risk. Going from 10% to 9% is clinically meaningful. Going from 9% to 8% is another major step. Progress matters more than perfection.
Your A1C should be checked at least twice a year if you’re meeting your goals and stable on your current treatment plan. If your treatment has recently changed or you’re not yet at target, testing every three months gives you and your care team faster feedback on what’s working. Because the test reflects a two- to three-month average, checking it more frequently than that won’t yield useful new information.