A normal A1C level is below 5.7%. If you have diabetes, the general target is below 7%, though your ideal number depends on your age, overall health, and whether you’re pregnant. 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.
The Three A1C Ranges
The CDC uses these cutoffs for diagnosis:
- Normal: below 5.7%
- Prediabetes: 5.7% to 6.4%
- Diabetes: 6.5% or above
A result in the prediabetes range means your blood sugar is higher than it should be but hasn’t crossed into diabetes territory yet. This is the window where lifestyle changes, such as losing 5 to 7 percent of your body weight or adding 150 minutes of weekly exercise, are most effective at preventing progression. A reading of 6.5% or higher on two separate tests typically confirms a diabetes diagnosis.
What A1C Actually Measures
Glucose in your bloodstream sticks to hemoglobin, the protein inside red blood cells that carries oxygen. The higher your blood sugar runs over time, the more glucose attaches. Because red blood cells live about 90 to 120 days, the A1C test captures a weighted average of your blood sugar across that window, with more recent weeks influencing the result more heavily.
This is why your doctor orders the test every few months rather than relying on daily glucose readings alone. A single blood sugar check tells you what’s happening right now. A1C tells you the trend.
A1C Translated to Average Blood Sugar
Your A1C percentage maps to an estimated average glucose (eAG), which is the number you’d see on a glucose meter, measured in mg/dL. Here’s how they line up:
- 5.0% = about 97 mg/dL
- 6.0% = about 126 mg/dL
- 7.0% = about 154 mg/dL
- 8.0% = about 183 mg/dL
- 9.0% = about 212 mg/dL
- 10.0% = about 240 mg/dL
Each 1% increase in A1C corresponds to roughly a 29 mg/dL jump in average blood sugar. If your A1C is 8%, your blood sugar has been averaging around 183 mg/dL, well above the 154 mg/dL that corresponds to the standard 7% target.
Targets for Adults With Diabetes
The American Diabetes Association’s 2025 Standards of Care recommend an A1C below 7% for most nonpregnant adults with diabetes, provided they can reach that level without frequent or severe episodes of low blood sugar. Going lower than 7% is considered acceptable, and even beneficial, if you can do it safely. Some people with well-controlled type 2 diabetes on medications that don’t cause low blood sugar can aim for 6.5% or less.
The key word is “safely.” Pushing your A1C lower through aggressive medication or insulin dosing increases the risk of hypoglycemia, which can cause confusion, falls, and in serious cases, loss of consciousness. The goal is the lowest number you can sustain without those episodes disrupting your daily life.
How Targets Change With Age and Health
A 7% target works well for younger and middle-aged adults who are otherwise healthy. For older adults, the math shifts because the risks of low blood sugar become more dangerous (falls, fractures, cognitive effects) while the long-term benefits of tight control shrink when life expectancy is shorter.
Healthy older adults without major complications typically aim for below 7.5%. Older adults with significant health conditions or a life expectancy under 10 years have a target closer to 8% or below. For those with severe comorbidities, cognitive decline, or functional disability, individualized goals may go as high as 8.5%, with the focus shifting toward preventing dangerous blood sugar swings in either direction and preserving quality of life.
A1C During Pregnancy
Pregnancy lowers the bar significantly. Red blood cells turn over faster during pregnancy, which naturally brings A1C readings down, so the reference range shifts. The American Diabetes Association recommends an A1C below 6% for pregnant women, provided they can hit that target without hypoglycemia. For women planning a pregnancy, getting A1C below 7% before conception is important because high blood sugar in the earliest weeks of pregnancy increases the risk of birth defects, sometimes before a woman even knows she’s pregnant.
When Your A1C Might Be Wrong
Several conditions can throw off your results. Anything that shortens the lifespan of your red blood cells, like hemolytic anemia, recent significant blood loss, or blood transfusions, will make your A1C look artificially low because the red blood cells haven’t been around long enough to accumulate glucose. Iron deficiency anemia pushes results in the opposite direction, producing a falsely high reading.
Genetic hemoglobin variants, particularly sickle cell trait and hemoglobin C trait, can also interfere with certain A1C test methods. Kidney disease complicates things further. Chemical changes to hemoglobin caused by kidney failure, along with the anemia that often accompanies it, can make A1C unreliable for people on dialysis. In these cases, alternative markers like fructosamine or glycated albumin give a more accurate picture.
If you have any of these conditions, your results should be interpreted carefully rather than taken at face value.
How Often to Test
The American Diabetes Association recommends testing every six months if your A1C is within your goal range and your treatment plan is stable. If you’re above target or you’ve recently changed medications, more frequent testing (typically every three months) helps you see whether the changes are working. For people without diabetes who are screening for prediabetes, testing every one to three years is standard depending on risk factors like weight, family history, and age.
Lowering Your A1C
A1C responds to the same strategies that lower daily blood sugar, but the three-month average means you won’t see the result of changes overnight. Most people can expect to see a meaningful shift after about three months of consistent effort.
For people with prediabetes or early type 2 diabetes, the most impactful changes are reducing refined carbohydrates, increasing physical activity, and losing a moderate amount of weight. Cutting even 50 grams of daily carbohydrates or walking 30 minutes after meals can noticeably lower post-meal glucose spikes, which are a major driver of A1C. For those on medication, taking it consistently and at the right time matters as much as the drug itself. Skipping doses or taking them inconsistently creates blood sugar swings that push A1C up even when your “good days” look fine.
Every 1% reduction in A1C is clinically meaningful. Dropping from 9% to 8% meaningfully reduces the risk of diabetes-related complications affecting your eyes, kidneys, and nerves. You don’t need to hit a perfect number to benefit from improvement.