For most adults with diabetes, a good blood sugar level is 80 to 130 mg/dL before meals and under 180 mg/dL two hours after eating. These are the standard targets recommended by the CDC and American Diabetes Association, but your ideal range may be tighter or more relaxed depending on your age, type of diabetes, pregnancy status, and overall health.
Standard Targets for Adults
The two numbers most people with diabetes track are pre-meal and post-meal blood sugar. Before a meal (including fasting in the morning), the target is 80 to 130 mg/dL. Two hours after the start of a meal, the goal is to stay below 180 mg/dL. These ranges apply to most non-pregnant adults with type 1 or type 2 diabetes.
Your A1C, which reflects your average blood sugar over roughly three months, is the other key measurement. Most adults aim for an A1C below 7%, which corresponds to an estimated average blood sugar of about 154 mg/dL. Some people can safely target below 6.5%, while others benefit from a higher ceiling. Your doctor sets this based on your risk of low blood sugar episodes and your overall treatment plan.
Targets During Pregnancy
Pregnancy requires tighter blood sugar control because elevated glucose crosses the placenta and affects the baby’s growth. The American College of Obstetricians and Gynecologists recommends these targets for pregnant women with type 1, type 2, or gestational diabetes:
- Fasting: below 95 mg/dL
- One hour after eating: below 140 mg/dL
- Two hours after eating: below 120 mg/dL
These are noticeably lower than the standard adult targets. Hitting them often requires more frequent monitoring, dietary changes, and sometimes medication adjustments throughout the pregnancy.
Targets for Children and Teens
Children and adolescents with type 1 diabetes follow ranges similar to adults, with a few refinements. Before meals and at bedtime, the recommended target is 70 to 144 mg/dL. After meals, the goal is to stay between 70 and 180 mg/dL. The International Society for Pediatric and Adolescent Diabetes recommends an A1C of 7% or lower for most kids, and 6.5% or lower for those using advanced technology like continuous glucose monitors and automated insulin delivery systems, as long as reaching that tighter target doesn’t create added stress or reduce quality of life.
Adjusted Ranges for Older Adults
For older adults, especially those with multiple health conditions or cognitive decline, the priority shifts. Avoiding dangerously low blood sugar becomes more important than keeping numbers as tight as possible, because hypoglycemia in this group can cause falls, confusion, and hospitalizations.
Guidelines from Diabetes Canada lay out a sliding scale based on functional status. Older adults who are functionally dependent typically aim for an A1C below 8%, which translates to higher acceptable daily readings. Those who are frail or living with dementia may target an A1C up to 8.5%. For people at the end of life, A1C testing is no longer recommended. The goal becomes simply avoiding symptoms from very high or very low blood sugar.
If you or a family member falls into one of these categories, the day-to-day targets your care team sets will be more relaxed than the standard 80 to 130 mg/dL range. That’s intentional, not a failure of management.
Time in Range: A Newer Way to Measure
If you wear a continuous glucose monitor (CGM), you’ll encounter a metric called “time in range.” This measures what percentage of the day your blood sugar stays between 70 and 180 mg/dL. Most adults should aim for at least 70% of readings in that window, which works out to roughly 17 out of 24 hours each day.
Time in range captures something that A1C and finger-stick checks miss: how much your blood sugar swings throughout the day. Two people can have the same A1C, but one might have steady readings while the other bounces between highs and lows. A higher time in range generally means fewer of those spikes and crashes. For children and teens, the targets are the same (over 70%), with an additional goal of spending less than 4% of the day below 70 mg/dL and less than 25% above 180 mg/dL.
When Blood Sugar Gets Dangerously High
Knowing your target range also means knowing when numbers signal a medical emergency. Blood sugar above 200 mg/dL that stays elevated, combined with nausea, vomiting, or fruity-smelling breath, can indicate diabetic ketoacidosis (DKA), a life-threatening condition most common in type 1 diabetes. DKA is formally diagnosed at glucose levels of 200 mg/dL or higher alongside other metabolic changes.
A separate emergency, called hyperglycemic hyperosmolar state, occurs primarily in type 2 diabetes when blood sugar climbs to 600 mg/dL or above. This condition develops more slowly, often over days, and causes severe dehydration and confusion. Both situations require emergency treatment.
Occasional readings above 180 mg/dL are common and not immediately dangerous, but sustained highs above 250 mg/dL warrant prompt attention, especially if you’re feeling unwell.
Why Your Target May Differ
The standard ranges are starting points, not rigid rules. Several factors can shift your personal target in either direction. People with a long history of severe low blood sugar episodes may be given a higher ceiling to reduce that risk. Someone newly diagnosed, young, and otherwise healthy might aim for tighter control to prevent long-term complications. The type of medication matters too: treatments that can cause low blood sugar (like insulin) typically come with slightly more relaxed targets than those that don’t.
The practical takeaway is that “good” blood sugar is the range that balances long-term protection against complications with short-term safety from lows. For most people, that’s 80 to 130 mg/dL before meals and under 180 mg/dL after. For you specifically, the best target is the one built around your health, your medications, and your daily life.