The Ultimate Blood Sugar Levels Chart by Age (mg/dL and mmol/L)

23 Aug 2025

The Ultimate Blood Sugar Levels Chart by Age (mg/dL and mmol/L) Understanding blood sugar levels is crucial for managing your health, especially if yo...

The Ultimate Blood Sugar Levels Chart by Age (mg/dL and mmol/L)

Understanding blood sugar levels is crucial for managing your health, especially if you have diabetes or are at risk. Maintaining stable blood sugar helps prevent long-term complications. This comprehensive guide provides a detailed blood sugar levels chart broken down by age, in both mg/dL and mmol/L. We'll cover everything from normal ranges to what to do if your blood sugar is too high or too low.

Why Monitoring Blood Sugar Levels is Important

Regular blood sugar monitoring helps you and your doctor understand how your body is responding to food, exercise, and medication. Keeping track of your blood sugar levels enables you to:

  • Detect hyperglycemia (high blood sugar) or hypoglycemia (low blood sugar).
  • Adjust your diet and exercise routines to maintain healthier levels.
  • Make informed decisions about medication dosages.
  • Improve overall diabetes management.

Blood Sugar Levels Chart by Age (mg/dL and mmol/L)

Here's a detailed chart outlining target blood sugar levels at various times of the day, segmented by age groups. Remember that individual targets may vary based on specific health conditions, medications, and doctor recommendations.

Age Group Time of Day Target Blood Sugar (mg/dL) Target Blood Sugar (mmol/L)
Children (6-12 years) Before Meal 80-180 4.4-10.0
Children (6-12 years) After Meal (1-2 hours) Up to 140 Up to 7.8
Teens (13-19 years) Before Meal 70-150 3.9-8.3
Teens (13-19 years) After Meal (1-2 hours) Up to 140 Up to 7.8
Adults (20+ years) Non-Diabetic Fasting (Before Meal) Less than 100 Less than 5.6
Adults (20+ years) Non-Diabetic After Meal (1-2 hours) Less than 140 Less than 7.8
Adults (20+ years) Diabetic Before Meal 80-130 4.4-7.2
Adults (20+ years) Diabetic After Meal (1-2 hours) Less than 180 Less than 10.0
Elderly (65+ years) Before Meal 80-180 4.4-10.0
Elderly (65+ years) After Meal (1-2 hours) Less than 180 Less than 10.0

Note: These are general guidelines. Always consult with your healthcare provider for personalized blood sugar targets.**

Understanding the Numbers: mg/dL vs. mmol/L

Blood sugar can be measured in two primary units:

  • mg/dL (milligrams per deciliter): This is the standard unit used in the United States and some other countries.
  • mmol/L (millimoles per liter): This unit is more commonly used in Canada, Europe, and other parts of the world.

To convert from mg/dL to mmol/L, divide the mg/dL value by 18. To convert from mmol/L to mg/dL, multiply the mmol/L value by 18.

What to Do If Your Blood Sugar is Too High (Hyperglycemia)

Hyperglycemia, or high blood sugar, can occur for various reasons, including:

  • Eating too many carbohydrates.
  • Being inactive.
  • Not taking enough diabetes medication.
  • Illness or stress.

Symptoms of hyperglycemia may include:

  • Increased thirst.
  • Frequent urination.
  • Blurred vision.
  • Fatigue.
  • Headache.

How to manage hyperglycemia:

  1. Check your blood sugar levels frequently.
  2. Drink plenty of water to stay hydrated.
  3. Follow your doctor's instructions for medication adjustments.
  4. Engage in light exercise if appropriate and approved by your doctor.
  5. If levels remain high or symptoms worsen, seek immediate medical attention.

What to Do If Your Blood Sugar is Too Low (Hypoglycemia)

Hypoglycemia, or low blood sugar, can be caused by:

  • Taking too much diabetes medication.
  • Skipping meals or not eating enough.
  • Excessive exercise.
  • Drinking alcohol.

Symptoms of hypoglycemia may include:

  • Shakiness.
  • Sweating.
  • Dizziness.
  • Confusion.
  • Hunger.
  • Irritability.

How to manage hypoglycemia:

  1. Follow the "15-15 Rule": Consume 15 grams of fast-acting carbohydrates (e.g., glucose tablets, fruit juice, regular soda).
  2. Wait 15 minutes and recheck your blood sugar.
  3. If still low, repeat the process.
  4. Once your blood sugar is back in a safe range, eat a snack or meal to prevent another drop.
  5. If you lose consciousness or are unable to treat yourself, seek emergency medical help.

Factors Affecting Blood Sugar Levels

Many factors can influence your blood sugar levels, including:

  • Diet: Carbohydrates have the most significant impact on blood sugar.
  • Exercise: Physical activity can lower blood sugar.
  • Medications: Insulin and oral diabetes medications can affect blood sugar.
  • Stress: Stress hormones can raise blood sugar.
  • Illness: Infections and other illnesses can influence blood sugar.
  • Hydration: Dehydration can affect blood sugar.
  • Sleep: Lack of sleep can impact blood sugar regulation.
  • Menstrual Cycle: Hormone fluctuations during menstruation can affect blood sugar in women.

Tips for Maintaining Healthy Blood Sugar Levels

Here are some strategies to help keep your blood sugar levels within a healthy range:

Related reading: A1C To Blood Sugar Conversion Use Our A1C Calculator And Chart

  • Eat a Balanced Diet: Focus on whole foods, lean proteins, healthy fats, and complex carbohydrates.
  • Control Carbohydrate Intake: Monitor your carb intake and choose fiber-rich options.
  • Exercise Regularly: Aim for at least 30 minutes of moderate-intensity exercise most days of the week.
  • Monitor Blood Sugar Regularly: Use a blood glucose meter or continuous glucose monitor (CGM) to track your levels.
  • Stay Hydrated: Drink plenty of water throughout the day.
  • Manage Stress: Practice stress-reducing techniques like meditation or yoga.
  • Get Enough Sleep: Aim for 7-8 hours of quality sleep each night.
  • Follow Your Doctor's Recommendations: Work with your healthcare provider to develop a personalized diabetes management plan.

The Role of A1C Testing

Related reading: The Complete A1C Chart From Normal To Diabetes Diagnosis Levels

The A1C test provides an average of your blood sugar levels over the past 2-3 months. It’s a valuable tool for assessing long-term blood sugar control. The A1C target for many adults with diabetes is typically below 7%. However, individual targets may vary based on age, health conditions, and other factors, so discuss your target A1C with your doctor.

Related reading: Mg Dl To Mmol L A Simple Guide To Converting Your Blood Sugar Readings

Conclusion

Managing blood sugar levels is a lifelong journey that requires commitment, knowledge, and collaboration with your healthcare team. By understanding your target blood sugar ranges, being aware of the factors that can influence your levels, and following a healthy lifestyle, you can take control of your health and minimize the risk of diabetes-related complications. This blood sugar levels chart and the information provided are designed to empower you to make informed decisions and live a healthier, more fulfilling life. Always consult with your doctor for personalized advice and treatment.