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

23 Aug 2025

The Ultimate Blood Sugar Levels Chart (mg/dL & mmol/L) by Age Understanding blood sugar levels is crucial for maintaining optimal health, especial...

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

Understanding blood sugar levels is crucial for maintaining optimal health, especially for individuals managing diabetes or those at risk. This comprehensive guide provides detailed blood sugar level charts in both mg/dL and mmol/L, broken down by age, offering a clear understanding of healthy ranges and potential warning signs.

Why Blood Sugar Monitoring Matters

Regularly monitoring blood glucose levels is essential for several reasons:

  • Diabetes Management: Helps individuals with diabetes adjust their medication, diet, and exercise routines to keep blood sugar within target ranges.
  • Early Detection: Identifies prediabetes, allowing for lifestyle changes to prevent the onset of type 2 diabetes.
  • Overall Health: Provides insights into how diet, exercise, and stress affect blood sugar levels, promoting better overall health.

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

Related reading: Hyperglycemia Vs Hypoglycemia Understanding The Critical Differences

Blood sugar levels are typically measured in two units:

  • mg/dL (milligrams per deciliter): This is the standard unit used in the United States.
  • mmol/L (millimoles per liter): This is the standard unit used in most 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.

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

This section provides detailed blood sugar level charts for different age groups, including children, adults, and seniors. The chart outlines target ranges for fasting blood sugar, postprandial (after meal) blood sugar, and HbA1c (a measure of average blood sugar over the past 2-3 months).

Children and Teenagers (Ages 0-19)

Measurement Target Range (mg/dL) Target Range (mmol/L)
Fasting Blood Sugar 70-150 mg/dL 3.9-8.3 mmol/L
Postprandial (1-2 hours after eating) Less than 140 mg/dL Less than 7.8 mmol/L
HbA1c Less than 7.5% (recommended by ADA) N/A

Note: These ranges can vary slightly based on individual circumstances and should be discussed with a pediatrician or endocrinologist. Strict control in children is still vital to minimize complications and promote long-term health. These measurements refer to people diagnosed with type 1 diabetes

Adults (Ages 20-59)

Related reading: Your Complete Guide To Managing Blood Sugar Levels For Better Health

For non-diabetic adults:

Measurement Target Range (mg/dL) Target Range (mmol/L)
Fasting Blood Sugar 70-99 mg/dL 3.9-5.5 mmol/L
Postprandial (2 hours after eating) Less than 140 mg/dL Less than 7.8 mmol/L
HbA1c Less than 5.7% N/A

For adults with diabetes, targets may be different. Always consult with a healthcare professional:

Measurement Target Range (mg/dL) Target Range (mmol/L)
Fasting Blood Sugar 80-130 mg/dL 4.4-7.2 mmol/L
Postprandial (1-2 hours after eating) Less than 180 mg/dL Less than 10.0 mmol/L
HbA1c Less than 7.0% (recommended by ADA) N/A

Note: These are general guidelines, and individual targets may vary based on health status and doctor's recommendations.

Seniors (Ages 60+)

For non-diabetic seniors:

Measurement Target Range (mg/dL) Target Range (mmol/L)
Fasting Blood Sugar 70-99 mg/dL 3.9-5.5 mmol/L
Postprandial (2 hours after eating) Less than 140 mg/dL Less than 7.8 mmol/L
HbA1c Less than 5.7% N/A

For seniors with diabetes, less stringent control may be appropriate to reduce the risk of hypoglycemia, particularly for those with multiple health issues:

Measurement Target Range (mg/dL) Target Range (mmol/L)
Fasting Blood Sugar 80-150 mg/dL 4.4-8.3 mmol/L
Postprandial (1-2 hours after eating) Less than 180 mg/dL Less than 10.0 mmol/L
HbA1c Less than 8.0% (Individualized Goal) N/A

Related reading: Managing Your Blood Glucose The Ultimate Guide To A Healthier Life

Note: Individualized target ranges are particularly important for seniors and should be determined in consultation with their healthcare provider.

Blood Sugar Levels: When to Seek Medical Advice

Certain blood sugar readings require immediate medical attention. Seek medical advice if you experience any of the following:

  • Hypoglycemia (Low Blood Sugar):
    • Symptoms: Shakiness, sweating, confusion, dizziness, rapid heartbeat.
    • Readings: Below 70 mg/dL (3.9 mmol/L) for most individuals.
  • Hyperglycemia (High Blood Sugar):
    • Symptoms: Increased thirst, frequent urination, blurred vision, fatigue.
    • Readings: Above 200 mg/dL (11.1 mmol/L) consistently.
  • Diabetic Ketoacidosis (DKA): A serious complication of diabetes.
    • Symptoms: Difficulty breathing, nausea, vomiting, stomach pain, confusion.
    • Requires immediate emergency care.

Factors Influencing Blood Sugar Levels

Many factors can affect blood sugar levels, including:

  • Diet: Consuming carbohydrates, especially sugary drinks and processed foods, can rapidly increase blood sugar.
  • Exercise: Physical activity helps lower blood sugar levels by increasing insulin sensitivity.
  • Stress: Stress hormones can elevate blood sugar levels.
  • Medications: Certain medications, such as steroids, can affect blood sugar.
  • Illness: Infections and illnesses can increase blood sugar levels.
  • Menstrual Cycle: Hormonal changes during menstruation can affect blood sugar levels in women.

Tips for Maintaining Healthy Blood Sugar Levels

  • Eat a Balanced Diet: Focus on whole foods, including fruits, vegetables, lean proteins, and whole grains. Limit processed foods, sugary drinks, and excessive carbohydrates.
  • Exercise Regularly: Aim for at least 30 minutes of moderate-intensity exercise most days of the week.
  • Monitor Blood Sugar Regularly: Check your blood sugar levels as recommended by your healthcare provider.
  • Manage Stress: Practice stress-reducing techniques such as meditation, yoga, or deep breathing exercises.
  • Stay Hydrated: Drink plenty of water throughout the day.
  • Get Enough Sleep: Aim for 7-9 hours of quality sleep each night.
  • Follow Your Doctor’s Recommendations: Work closely with your healthcare provider to manage diabetes or prediabetes effectively. This might include taking oral medication and/or insulin injections.

Common Blood Sugar Testing Methods

Several methods are available for blood sugar monitoring:

  • Finger-Prick Blood Glucose Meters: The most common method, involving pricking a finger and testing a drop of blood on a test strip.
  • Continuous Glucose Monitors (CGMs): Devices that continuously track blood sugar levels via a sensor inserted under the skin. CGMs provide real-time data and trends.
  • HbA1c Test: A blood test that measures average blood sugar levels over the past 2-3 months, usually performed in a doctor’s office.

Conclusion

Understanding and managing blood sugar levels is essential for individuals of all ages. By using the provided blood glucose level charts and following the recommended tips, you can take proactive steps to maintain healthy blood sugar levels and prevent diabetes-related complications. Remember to consult with your healthcare provider for personalized advice and management strategies. Monitoring your average blood glucose can give you a comprehensive overview.