Decoding Your Blood Sugar Levels: A Complete Chart for Mg/dL & Mmol/L

23 Aug 2025

Decoding Your Blood Sugar Levels: A Complete Chart for Mg/dL & Mmol/L Understanding your blood sugar levels is crucial for maintaining good health...

Decoding Your Blood Sugar Levels: A Complete Chart for Mg/dL & Mmol/L

Understanding your blood sugar levels is crucial for maintaining good health, especially if you have diabetes or are at risk of developing it. Whether you're using milligrams per deciliter (mg/dL) or millimoles per liter (mmol/L), knowing what's considered normal, prediabetic, and diabetic can empower you to make informed decisions about your diet, exercise, and overall well-being. This comprehensive guide provides clear blood sugar charts, explains the different measurement units, and offers insights into managing your glucose levels effectively.

Why Monitor Your Blood Sugar?

Regularly monitoring your blood sugar offers numerous benefits, including:

Related reading: Understanding Your Blood Sugar Range What S Healthy And What S Not

  • Early Detection of Diabetes: Identifies prediabetic or diabetic conditions early, allowing for timely intervention.
  • Effective Diabetes Management: Helps people with diabetes adjust their treatment plans (medication, diet, exercise) for optimal control.
  • Prevention of Complications: Prevents long-term health problems associated with poorly controlled blood sugar, such as nerve damage, kidney disease, and heart disease.
  • Personalized Insights: Provides valuable data for understanding how different foods, activities, and medications affect your glucose levels.

Understanding Blood Sugar Measurement Units: Mg/dL vs. Mmol/L

Blood sugar is measured in two primary units:

  • Milligrams per deciliter (mg/dL): This is the standard unit used in the United States.
  • Millimoles per liter (mmol/L): This is commonly used in countries like Canada and the United Kingdom.

Related reading: Feeling Shaky It Could Be Low Blood Sugar Hypoglycemia

It’s important to be familiar with both units to interpret lab results and communicate effectively with healthcare professionals, especially if you travel or encounter information from various sources.

Conversion Formula

To convert between mg/dL and mmol/L, use the following formula:

  • mg/dL = mmol/L x 18
  • mmol/L = mg/dL / 18

For example:

  • 70 mg/dL is approximately equal to 3.9 mmol/L (70 / 18 = 3.89)
  • 5 mmol/L is equal to 90 mg/dL (5 x 18 = 90)

Blood Sugar Level Chart (Mg/dL)

This chart provides a general guideline for blood sugar levels in mg/dL for people without diabetes, with prediabetes, and with diabetes.

Category Fasting Blood Sugar (mg/dL) 2 Hours After Meal (mg/dL) HbA1c (%)
Normal Less than 100 Less than 140 Less than 5.7%
Prediabetes 100 to 125 140 to 199 5.7% to 6.4%
Diabetes 126 or higher 200 or higher 6.5% or higher

Note: These values are general guidelines and can vary depending on individual factors and specific medical advice.

Blood Sugar Level Chart (Mmol/L)

This chart provides a general guideline for blood sugar levels in mmol/L.

Category Fasting Blood Sugar (mmol/L) 2 Hours After Meal (mmol/L) HbA1c (%)
Normal Less than 5.6 Less than 7.8 Less than 5.7%
Prediabetes 5.6 to 6.9 7.8 to 11.0 5.7% to 6.4%
Diabetes 7.0 or higher 11.1 or higher 6.5% or higher

Note: These values are general guidelines and can vary depending on individual factors and specific medical advice.

Types of Blood Sugar Tests

Several types of blood sugar tests are used to diagnose and monitor diabetes:

  1. Fasting Blood Sugar (FBS): Measured after at least eight hours of fasting. It is a common initial test for diabetes.
  2. Random Blood Sugar (RBS): Taken at any time, regardless of the last meal. A high random blood sugar level may prompt further testing.
  3. Oral Glucose Tolerance Test (OGTT): Requires fasting, then drinking a sugary liquid. Blood sugar levels are measured periodically for two hours. It is commonly used to diagnose gestational diabetes.
  4. A1C Test (Glycated Hemoglobin): Measures average blood sugar levels over the past two to three months. It does not require fasting and provides a long-term view of blood sugar control.

Factors Affecting Blood Sugar Levels

Many factors can influence your blood sugar levels, including:

  • Diet: Carbohydrates, especially refined sugars, can cause a rapid increase in blood sugar.
  • Physical Activity: Exercise helps lower blood sugar by improving insulin sensitivity and burning glucose.
  • Stress: Stress hormones can raise blood sugar levels.
  • Illness: Infections and other illnesses can increase blood sugar.
  • Medications: Certain medications, such as steroids, can raise blood sugar levels.
  • Dehydration: Can lead to concentrated blood sugar.

How to Maintain Healthy Blood Sugar Levels

Adopting a healthy lifestyle is crucial for maintaining optimal blood sugar levels. Here are some practical tips:

  1. Follow a Balanced Diet: Focus on whole foods, including fruits, vegetables, whole grains, and lean proteins. Limit processed foods, sugary drinks, and refined carbohydrates.
  2. Engage in Regular Physical Activity: Aim for at least 150 minutes of moderate-intensity exercise per week.
  3. Monitor Your Blood Sugar Regularly: Use a home glucose meter to check your blood sugar as recommended by your healthcare provider.
  4. Manage Stress: Practice relaxation techniques such as deep breathing, meditation, or yoga.
  5. Stay Hydrated: Drink plenty of water throughout the day.
  6. Get Enough Sleep: Aim for 7-8 hours of quality sleep each night.
  7. Follow Your Doctor's Advice: Adhere to prescribed medications and attend regular check-ups.

Understanding Hypoglycemia and Hyperglycemia

Related reading: A Practical Guide To Reading Your Blood Sugar Test Results At Home

Two common blood sugar imbalances are:

  • Hypoglycemia (Low Blood Sugar): Occurs when blood sugar levels drop too low (typically below 70 mg/dL or 3.9 mmol/L). Symptoms include shakiness, sweating, confusion, and dizziness. It requires immediate treatment, such as consuming glucose tablets or juice.
  • Hyperglycemia (High Blood Sugar): Occurs when blood sugar levels are too high (above the target range set by your doctor). Symptoms include increased thirst, frequent urination, blurred vision, and fatigue. It requires managing with diet, exercise, and medication.

The Role of HbA1c

The HbA1c test is an essential tool for monitoring long-term blood sugar control. It provides an average of your blood sugar levels over the past 2-3 months, giving a more comprehensive view than single-point-in-time glucose readings. A high A1C level indicates poor blood sugar control and increases the risk of diabetes-related complications. Regular A1C testing helps you and your healthcare team make informed decisions about your diabetes management plan.

Utilizing Continuous Glucose Monitoring (CGM)

Continuous Glucose Monitoring (CGM) systems have revolutionized diabetes management. These devices track glucose levels in real-time, providing a continuous stream of data to help you understand how your blood sugar fluctuates throughout the day and night. CGMs can alert you to highs and lows, enabling you to take timely action and maintain better control. They can be especially valuable for people with type 1 diabetes or those who experience frequent fluctuations in blood sugar.

Conclusion

Understanding your blood sugar levels is a cornerstone of good health, particularly if you are managing diabetes. By familiarizing yourself with the measurement units (mg/dL and mmol/L), using the blood sugar charts provided, and implementing lifestyle strategies, you can effectively monitor and control your glucose levels. Always consult with your healthcare provider for personalized advice and guidance. With proactive management, you can lead a healthy and fulfilling life. Remember that consistent monitoring and lifestyle adjustments can significantly impact your well-being.