The Definitive Blood Sugar Levels Chart (mg/dL and mmol/L)

23 Aug 2025

The Definitive Blood Sugar Levels Chart (mg/dL and mmol/L) Understanding blood sugar levels is crucial for anyone managing diabetes, prediabetes, or s...

The Definitive Blood Sugar Levels Chart (mg/dL and mmol/L)

Understanding blood sugar levels is crucial for anyone managing diabetes, prediabetes, or simply aiming for better health. This comprehensive guide provides a clear blood sugar levels chart, outlining normal ranges, levels indicating prediabetes, and those suggesting diabetes. We'll cover both mg/dL (milligrams per deciliter), the standard in the United States, and mmol/L (millimoles per liter), used in many other countries. Whether you're monitoring your own glucose or helping a loved one, this information will empower you to make informed decisions.

Related reading: Continuous Glucose Monitor Cgm A Game Changer For Managing Blood Sugar

Why Understanding Blood Sugar Levels is Important

Maintaining healthy blood sugar levels is essential for preventing serious health complications. Consistently high levels can lead to:

  • Heart disease: Damaged blood vessels increase the risk of cardiovascular problems.
  • Kidney disease: High glucose levels can damage the nephrons, the filtering units in your kidneys.
  • Nerve damage (neuropathy): Can cause pain, numbness, and digestive issues.
  • Eye damage (retinopathy): Can lead to blindness.
  • Foot problems: Increased risk of infections and ulcers.

Regular monitoring and management are key to avoiding these complications. Understanding your blood sugar levels helps you proactively manage your health and well-being.

The Blood Sugar Levels Chart: mg/dL and mmol/L

This chart provides a general overview of blood sugar levels at different times of the day. Always consult with your doctor for personalized recommendations.

Category mg/dL (Fasting) mmol/L (Fasting) mg/dL (2-hr postprandial) mmol/L (2-hr postprandial)
Normal Less than 100 Less than 5.6 Less than 140 Less than 7.8
Prediabetes 100 to 125 5.6 to 6.9 140 to 199 7.8 to 11.0
Diabetes 126 or higher 7.0 or higher 200 or higher 11.1 or higher
  • Fasting Blood Sugar: Measured after at least 8 hours of fasting.
  • 2-hour Postprandial Blood Sugar: Measured 2 hours after the start of a meal.

Understanding this blood sugar levels chart is your first step toward proactive health management.

Blood Sugar Levels and HbA1c

The HbA1c (Glycated Hemoglobin) test provides an average of your blood sugar levels over the past 2-3 months. It’s a crucial tool for managing diabetes. Here's how HbA1c levels correlate with average blood sugar:

HbA1c (%) Estimated Average Glucose (eAG) mg/dL Estimated Average Glucose (eAG) mmol/L
Less than 5.7% Less than 114 Less than 6.3
5.7% - 6.4% 114 - 139 6.3 - 7.7
6.5% or higher 140 or higher 7.8 or higher
  • Normal HbA1c: Less than 5.7%
  • Prediabetes HbA1c: 5.7% to 6.4%
  • Diabetes HbA1c: 6.5% or higher

Target HbA1c levels may vary based on individual circumstances. Work with your healthcare provider to establish a personalized target.

Factors Affecting Blood Sugar Levels

Related reading: The Complete Guide To Understanding Your Fasting Blood Sugar Test Results

Many factors can influence your blood sugar levels. These include:

  • Food and Drink: The type, amount, and timing of meals and beverages. Carbohydrates, in particular, have a significant impact.
  • Physical Activity: Exercise can lower blood sugar levels as your body uses glucose for energy.
  • Medications: Certain medications, like insulin and oral diabetes medications, directly impact glucose levels.
  • Stress: Stress hormones can raise blood sugar levels.
  • Illness: Infections and other illnesses can affect glucose metabolism.
  • Sleep: Poor sleep can negatively impact insulin sensitivity.
  • Hormones: Hormonal changes, particularly in women, can affect glucose levels.

How to Monitor Your Blood Sugar Levels

There are several methods for monitoring your blood sugar levels:

  • Blood Glucose Meter: The most common method, involving a finger prick and a small blood sample.
  • Continuous Glucose Monitor (CGM): A device that continuously tracks glucose levels via a sensor inserted under the skin. Provides real-time data and alerts.
  • HbA1c Test: Measures average blood sugar levels over the past 2-3 months.

Related reading: The Dangers Of High Blood Sugar Why You Must Control Your Glucose

Regular monitoring is crucial for effective diabetes management and prevention.

Tips for Maintaining Healthy Blood Sugar Levels

Adopting healthy lifestyle habits can significantly impact your blood sugar levels:

  • Eat a Balanced Diet: Focus on whole foods, lean proteins, and plenty of fruits and vegetables. Limit processed foods, sugary drinks, and refined carbohydrates.
  • Regular Physical Activity: Aim for at least 30 minutes of moderate-intensity exercise most days of the week.
  • Manage Stress: Practice relaxation techniques like yoga, meditation, or deep breathing exercises.
  • Get Enough Sleep: Aim for 7-8 hours of quality sleep each night.
  • Stay Hydrated: Drink plenty of water throughout the day.
  • Monitor Regularly: Check your blood sugar levels as directed by your healthcare provider.

When to Seek Medical Attention

It's essential to seek medical attention if you experience any of the following:

  • Repeatedly high blood sugar levels: Consistently elevated readings above your target range.
  • Severe symptoms of hyperglycemia (high blood sugar): Increased thirst, frequent urination, blurred vision, fatigue.
  • Symptoms of hypoglycemia (low blood sugar): Shakiness, sweating, confusion, dizziness.
  • Sudden changes in blood sugar levels: Unexplained fluctuations that are difficult to manage.

Prompt medical care can prevent serious complications.

Conclusion

Understanding your blood sugar levels is a cornerstone of good health, especially if you have diabetes or prediabetes. By using this definitive blood sugar levels chart, monitoring your levels regularly, and adopting healthy lifestyle habits, you can effectively manage your glucose and reduce your risk of complications. Always consult with your doctor for personalized advice and treatment plans. Remember, proactive management is key to a healthier future. The information provided here is not a substitute for professional medical advice.