For most adults with diabetes, a good blood sugar is 80 to 130 mg/dL before meals and under 180 mg/dL about one to two hours after eating. These are the standard targets set by the American Diabetes Association for 2025, but your ideal range may be slightly different depending on your age, how long you’ve had diabetes, and whether you’re at risk for dangerous lows.
Standard Blood Sugar Targets
The numbers most adults with diabetes should aim for break down into three key measurements:
- Before meals (fasting): 80 to 130 mg/dL
- One to two hours after eating: under 180 mg/dL
- A1C (your three-month average): under 7%
An A1C under 7% is the standard benchmark, but going lower can be even better if you can do it safely. The key qualification is “safely,” meaning without frequent episodes where your blood sugar drops too low. Some people with well-controlled diabetes maintain an A1C closer to 6.5%, and endocrinologists sometimes recommend this tighter target. The American Association of Clinical Endocrinologists actually sets its standard A1C goal at 6.5% or below, which is stricter than the ADA’s 7%.
Why These Numbers Matter
Blood sugar doesn’t just affect how you feel day to day. Over time, consistently elevated glucose damages small blood vessels throughout your body, particularly in your eyes, kidneys, and nerves. Research published in Diabetes Care found a direct causal relationship between glucose levels and the risk of retinopathy (eye damage), kidney disease, and nerve damage. For every 18 mg/dL increase in average blood sugar, the risk of retinopathy roughly doubled.
This damage accumulates gradually, which is why the A1C matters so much. A single high reading after a big meal isn’t cause for alarm. A pattern of readings that consistently run above target over weeks and months is what leads to complications.
When Targets Are Looser or Tighter
The standard targets work well for most adults, but they aren’t right for everyone. Older adults, people with multiple chronic conditions, or those with a history of severe low blood sugar episodes may benefit from a more relaxed A1C goal, sometimes up to 8% or even 8.5%. The reasoning is straightforward: for someone in their 80s with several health conditions, the risks of aggressive blood sugar lowering (falls from dizziness, confusion from lows) can outweigh the long-term benefits of tight control.
On the other end of the spectrum, younger adults who were recently diagnosed and have no complications may aim for an A1C below 6.5%. The earlier in the disease you establish tight control, the more years of protection you get against complications.
Blood Sugar Targets During Pregnancy
Pregnancy calls for significantly tighter blood sugar control. The targets for pregnant women with diabetes are:
- Fasting: 70 to 95 mg/dL
- One hour after eating: 110 to 140 mg/dL
- Two hours after eating: 100 to 120 mg/dL
These ranges are narrower because even moderately elevated blood sugar during pregnancy can affect fetal development. The fasting ceiling of 95 mg/dL is notably lower than the general target of 130 mg/dL.
Targets for Children With Type 1 Diabetes
Children with type 1 diabetes share the same A1C goal as adults: under 7%. The International Society for Pediatric and Adolescent Diabetes notes that children under 7 with access to modern insulin pumps and glucose monitors can often achieve an A1C of 6.5% or lower without a high risk of dangerous lows. The day-to-day target range for kids is generally 70 to 180 mg/dL, with a tighter 70 to 140 mg/dL range used as a more ambitious goal for younger children on advanced technology.
Understanding Time in Range
If you use a continuous glucose monitor (CGM), there’s another way to think about good blood sugar: time in range. This measures what percentage of the day your blood sugar stays between 70 and 180 mg/dL. The goal for most adults is to spend at least 70% of the day in that range, which works out to roughly 17 out of 24 hours.
Time in range gives you a more complete picture than individual finger-stick readings because it captures the ups and downs throughout the entire day, including overnight. Two people can have the same A1C but very different time-in-range numbers if one person swings between highs and lows while the other stays relatively steady. The steadier pattern is healthier even when the average looks the same.
Along with time in range, the goal is to spend less than 4% of the day below 70 mg/dL (under an hour). For older adults, that target is stricter: less than 1% of the day below 70 mg/dL, because low blood sugar is especially dangerous as you age.
Recognizing Low Blood Sugar
Good blood sugar control isn’t just about avoiding highs. Lows are an immediate safety concern, and knowing the thresholds helps you respond appropriately. Hypoglycemia is classified in three levels:
- Level 1 (alert value): 70 mg/dL or below. You may feel shaky, sweaty, or hungry. This is your signal to eat or drink something with fast-acting carbohydrates.
- Level 2 (clinically significant): below 54 mg/dL. At this point, your brain isn’t getting enough fuel. Symptoms can include confusion, blurred vision, and difficulty speaking.
- Level 3 (severe): no specific number, but defined by cognitive impairment severe enough that you need someone else’s help to recover. This can involve seizures or loss of consciousness.
If you’re frequently dipping below 70 mg/dL, your treatment plan likely needs adjustment. Tight control is only beneficial when it doesn’t come at the cost of frequent lows.
How Often to Check
How frequently you test depends on your treatment. If you take insulin, checking multiple times a day is typical: before meals, before bed, and sometimes in the middle of the night. If you manage type 2 diabetes with oral medications alone, your testing schedule may be less frequent, sometimes just a few times a week to spot patterns. A CGM removes much of this guesswork by providing readings every few minutes automatically.
Regardless of how often you test, the most useful thing you can do with your numbers is look for patterns rather than reacting to individual readings. A single fasting reading of 140 mg/dL is less informative than noticing your fasting numbers have been running between 135 and 150 all week. Patterns tell you whether your overall management strategy is working, and they give your care team something concrete to adjust.