For most non-diabetic adults, blood sugar should stay under 100 mg/dL fasting and under 140 mg/dL one to two hours after a meal. For most adults with diabetes, the American Diabetes Association recommends fasting and pre-meal targets of 80 to 130 mg/dL, post-meal under 180 mg/dL, and an A1C below 7 percent. Pregnancy and older-adult targets differ — pregnancy is stricter, older or frail adults are typically given more relaxed goals.
Targets at a Glance
| Population | Fasting / Pre-meal | Post-meal (1 to 2 hours) | A1C Target |
|---|---|---|---|
| Non-diabetic adult | Under 100 mg/dL | Under 140 mg/dL | Under 5.7% |
| Prediabetes | 100 to 125 mg/dL | 140 to 199 mg/dL | 5.7% to 6.4% |
| Adult with diabetes (general) | 80 to 130 mg/dL | Under 180 mg/dL | Under 7% |
| Older or frail adult with diabetes | 90 to 150 mg/dL | Under 200 mg/dL | Under 8% |
| Pregnancy (gestational or pre-existing) | Under 95 mg/dL | Under 140 mg/dL at 1 hr; under 120 mg/dL at 2 hr | Under 6.0% (or 6.5% if hypo risk) |
| Children and adolescents with T1D | 90 to 130 mg/dL | Under 180 mg/dL | Under 7% |
These targets come from the ADA Standards of Care in Diabetes 2025 and apply to most patients. Your prescriber may set a different goal based on your individual situation.
Non-Diabetic Adults
For an adult without diabetes, blood glucose is tightly regulated. Typical readings:
- Fasting (8+ hours without food): 70 to 99 mg/dL
- 1 hour after a meal: typically under 140 mg/dL, often under 120
- 2 hours after a meal: under 140 mg/dL, often returning to fasting baseline
- Random (any time): generally 70 to 140 mg/dL
- A1C: under 5.7 percent
Continuous glucose monitor data in non-diabetic adults shows mean glucose around 99 to 110 mg/dL with brief excursions to 140 to 160 after large carbohydrate meals.
Prediabetes
Prediabetes is defined by:
- Fasting glucose: 100 to 125 mg/dL (impaired fasting glucose)
- 2-hour OGTT result: 140 to 199 mg/dL (impaired glucose tolerance)
- A1C: 5.7 to 6.4 percent
Goals for someone with prediabetes are to bring numbers back into the normal range through weight loss of 5 to 10 percent, 150 minutes per week of activity, and a Mediterranean or lower-carb eating pattern. See whether prediabetes is reversible for what the research shows.
Adults With Diabetes (General Target)
For most non-pregnant adults with type 1 or type 2 diabetes:
- Fasting / pre-meal: 80 to 130 mg/dL
- Peak post-meal (1 to 2 hours): under 180 mg/dL
- A1C: under 7.0 percent
- CGM time-in-range (70 to 180 mg/dL): more than 70 percent
- Time below range (under 70 mg/dL): less than 4 percent
Stricter targets (A1C under 6.5 percent) may be appropriate for younger patients with short disease duration, no significant cardiovascular disease, and low hypoglycemia risk.
Older or Frail Adults
The ADA explicitly relaxes targets for older adults with multiple comorbidities, frailty, cognitive impairment, or limited life expectancy:
- Healthy older adult: A1C under 7.0 to 7.5 percent
- Complex / intermediate health: A1C under 8.0 percent
- Very complex / poor health: avoid both severe hyperglycemia and hypoglycemia rather than chasing a number; A1C under 8.5 percent acceptable
The reasoning is that hypoglycemia in older adults causes falls, fractures, hospitalization, and cognitive harm — risks that often outweigh the long-term microvascular benefits of strict control.
Pregnancy
Tight control in pregnancy reduces risks of macrosomia (large baby), birth complications, neonatal hypoglycemia, and pre-eclampsia. ADA targets for gestational diabetes and pregestational diabetes:
- Fasting: under 95 mg/dL
- 1 hour post-meal: under 140 mg/dL
- 2 hours post-meal: under 120 mg/dL
- A1C: ideally under 6.0 percent (or under 6.5 percent if hypoglycemia risk)
These tighter goals reflect the demonstrated benefit to both mother and baby. Self-monitoring is typically done fasting and after each main meal.
Children and Adolescents
For children with type 1 diabetes, ADA recommends:
- Pre-meal: 90 to 130 mg/dL
- Bedtime / overnight: 90 to 150 mg/dL
- A1C: under 7 percent (individualized — some clinics aim for 6.5 percent if achievable safely)
How These Targets Translate to A1C
| A1C | Estimated Average Glucose (eAG) | Status |
|---|---|---|
| 5.0% | 97 mg/dL | Normal |
| 5.7% | 117 mg/dL | Prediabetes threshold |
| 6.0% | 126 mg/dL | Prediabetes |
| 6.5% | 140 mg/dL | Diabetes threshold |
| 7.0% | 154 mg/dL | ADA target for most adults with diabetes |
| 8.0% | 183 mg/dL | Above target — review the regimen |
| 9.0% | 212 mg/dL | Significantly above target |
For more on what the A1C test measures and how often to check, see our A1C levels guide.
The Bottom Line
What your blood sugar should be depends on whether you have diabetes, your age, your other health conditions, and whether you are pregnant. Most non-diabetic adults should sit under 100 mg/dL fasting and under 140 mg/dL post-meal. Most adults with diabetes aim for 80 to 130 mg/dL fasting and under 180 mg/dL post-meal, with an A1C under 7 percent. Older, frail, and pregnant patients each have their own targets. Always confirm your individual goals with your prescriber rather than relying on general numbers.
