For most adults with diabetes, a normal blood sugar is 80 to 130 mg/dL before meals and under 180 mg/dL one to two hours after eating. These are the targets recommended by the American Diabetes Association, though your personal goals may be tighter or more relaxed depending on your age, health, and risk of low blood sugar episodes.
Standard Blood Sugar Targets for Adults
The ADA recommends these targets for most nonpregnant adults with diabetes:
- Before meals (fasting or pre-meal): 80 to 130 mg/dL
- 1 to 2 hours after the start of a meal: less than 180 mg/dL
- A1C (a 2- to 3-month average): less than 7%
The American Association of Clinical Endocrinology sets slightly tighter goals for people who can safely reach them without frequent blood sugar drops: under 110 mg/dL before meals, under 140 mg/dL after meals, and an A1C at or below 6.5%. These stricter targets are intended for people not on insulin or other medications that carry a higher risk of low blood sugar. If you’re hitting these numbers comfortably, great. If reaching them means you’re frequently dipping too low, the standard ADA range is a safer bet.
Why Targets Vary From Person to Person
There is no single “normal” number for every person with diabetes. Your target range depends on how long you’ve had diabetes, what medications you take, your age, and whether you have other health conditions. Someone newly diagnosed and otherwise healthy might aim for the tighter AACE targets, while someone with a long history of diabetes, kidney problems, or frequent low blood sugar episodes might aim for an A1C between 7% and 8%.
The core principle is balancing two risks: keeping blood sugar low enough to prevent long-term complications (eye, kidney, and nerve damage) while keeping it high enough to avoid dangerous lows. The “right” target is the one that minimizes both.
Targets During Pregnancy
Pregnancy requires much tighter blood sugar control. The American College of Obstetricians and Gynecologists and the ADA both recommend a fasting blood sugar under 95 mg/dL, a one-hour post-meal reading under 140 mg/dL, and a two-hour post-meal reading under 120 mg/dL. Post-meal timing starts from the beginning of the meal, not the end. These stricter ranges protect against complications for both the mother and baby.
Targets for Older Adults
For older adults, especially those managing multiple health conditions or frailty, the priorities shift. Preventing low blood sugar becomes more important than hitting tight numbers, because a severe low can cause falls, confusion, or hospitalization.
Diabetes Canada breaks this down by functional status. Older adults who are fully independent aim for the same A1C target as younger adults (7% or below). Those who are functionally dependent have a target under 8%, with pre-meal blood sugars of 90 to 144 mg/dL. For frail older adults or those with dementia, the A1C target relaxes further to under 8.5%, with pre-meal readings as high as 162 mg/dL considered acceptable. At end of life, A1C testing is no longer recommended. The goal simply becomes avoiding symptoms from either high or low blood sugar.
Targets for Children and Teens
Pediatric targets are slightly wider than adult targets. International guidelines recommend pre-meal blood sugars of 70 to 144 mg/dL and post-meal readings of 70 to 180 mg/dL. Bedtime targets fall in that same 70 to 144 mg/dL range, though caregivers may feel more comfortable with slightly higher readings at bedtime, particularly after exercise, a recent low, or in children who don’t reliably feel symptoms of dropping blood sugar.
Time in Range: A Newer Way to Measure
If you use a continuous glucose monitor (CGM), you’ll see a metric called Time in Range. This tells you what percentage of the day your blood sugar stays between 70 and 180 mg/dL. For most adults with Type 1 or Type 2 diabetes, the goal is spending at least 70% of the day in that range, which works out to roughly 17 hours out of 24.
Time in Range gives a fuller picture than individual finger-stick readings because it captures the highs and lows that happen between meals, overnight, and during exercise. Two people can have the same A1C but very different daily patterns. One might hold steady in range most of the day, while the other swings between high spikes and low dips that average out to the same number. Time in Range reveals those differences in a way that A1C alone cannot.
When Blood Sugar Is Too Low
Low blood sugar (hypoglycemia) is classified in three levels. Level 1 is a reading below 70 mg/dL but at or above 54 mg/dL. You may feel shaky, sweaty, or irritable. Level 2 is below 54 mg/dL, which is more dangerous and typically causes confusion, blurred vision, or difficulty concentrating. Level 3 is any episode where you can’t function or help yourself because of mental or physical changes from low blood sugar and need someone else’s assistance.
Even level 1 lows matter. Frequent mild lows can dull your body’s ability to sense dropping blood sugar over time, making severe episodes more likely. If you’re regularly dipping below 70 mg/dL, that’s a signal your targets or medication may need adjusting.
When Blood Sugar Is Too High
Occasional readings above 180 mg/dL after a large meal aren’t unusual, but sustained highs deserve attention. If you’re sick and your blood sugar reaches 240 mg/dL or above, the CDC recommends checking for ketones using an over-the-counter urine or blood ketone test kit. High ketones can signal diabetic ketoacidosis, a serious condition that requires prompt medical care. Even outside of illness, blood sugars that consistently run above your target range increase the risk of long-term complications over months and years.
Putting the Numbers Together
Here’s a practical way to think about it. Your pre-meal readings tell you how well your baseline is controlled, whether that’s through medication, diet, or your body’s own insulin production overnight. Your post-meal readings tell you how well your body handles the food you eat. And your A1C or Time in Range tells you how the overall pattern looks across weeks and months. No single reading defines your control. A fasting number of 135 mg/dL one morning isn’t a crisis, but if your fasting readings average 135 over several weeks, that trend is worth addressing.
The numbers that matter most are the ones you can sustain without frequent lows, without constant anxiety, and without sacrificing your quality of life. For most people with diabetes, that means pre-meal readings between 80 and 130 mg/dL, post-meal readings under 180 mg/dL, and an A1C under 7%.