BP & SugarNormal Blood Sugar Levels: Chart By Time Of Day
For most adults without diabetes, a normal fasting blood sugar level is 70–99 mg/dL (3.9–5.5 mmol/L) and below 140 mg/dL (7.8 mmol/L) two hours after a meal.
Blood Sugar Levels Chart
| Reading | Normal | Prediabetes | Diabetes |
|---|---|---|---|
| Fasting | 70–99 mg/dL (3.9–5.5) | 100–125 mg/dL (5.6–6.9) | ≥126 mg/dL (≥7.0) |
| 2 h after meal | <140 mg/dL (<7.8) | 140–199 mg/dL (7.8–11.0) | ≥200 mg/dL (≥11.1) |
| A1C | <5.7% | 5.7–6.4% | ≥6.5% |
Ranges based on the American Diabetes Association Standards of Care. Values in brackets are mmol/L.
Targets If You Have Diabetes
Common targets for many adults with diabetes are 80–130 mg/dL before meals and below 180 mg/dL 1–2 hours after eating, but your doctor may set different goals for you.
How To Read Your Blood Sugar Graphs
- Look at averages, not single readings.
- Compare fasting readings across weeks.
- Check time in range (70–180 mg/dL) — higher is better.
- Note patterns after specific meals.
Need to convert units? Use our Blood Sugar Unit Converter: mg/dL To mmol/L.
Low And High Blood Sugar
Below 70 mg/dL (3.9 mmol/L) is low blood sugar (hypoglycemia) and needs quick treatment. Very high readings with symptoms such as thirst, frequent urination or confusion need medical attention.
Learn the warning signs in Low Blood Sugar: Symptoms, Causes And What To Do.
Frequently Asked Questions
What is a normal blood sugar level after eating?
Below 140 mg/dL (7.8 mmol/L) two hours after a meal for people without diabetes.
What blood sugar level is dangerous?
Below 54 mg/dL (3.0 mmol/L) or very high readings with symptoms need urgent attention.
Track blood sugar and blood pressure in one app
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This content is for information only and does not replace advice from your doctor. If you think you have very low or very high blood sugar, or a blood pressure above 180/120 mmHg with symptoms, seek medical help immediately.
Related Guides
Low Blood Sugar: Symptoms, Causes And What To Do
Low blood sugar (below 70 mg/dL): symptoms like shaking and sweating, common causes, the 15-15 rule to treat it and how logging helps you prevent lows.
Blood Sugar Unit Converter: mg/dL To mmol/L
Free blood sugar unit converter: convert glucose from mg/dL to mmol/L and back instantly, with the formula and a quick reference table of common values.
Free Blood Sugar Tracker App: Log Glucose In Seconds
A free blood sugar tracker to log glucose in mg/dL or mmol/L, see graphs and time in range, and set reminders. Learn how to track blood sugar effectively.