Decoding Your Blood Sugar Levels Chart (mg/dL & mmol/L)

23 Aug 2025

Decoding Your Blood Sugar Levels Chart (mg/dL & mmol/L) Understanding your blood sugar levels is crucial for managing diabetes or prediabetes and ...

Decoding Your Blood Sugar Levels Chart (mg/dL & mmol/L)

Understanding your blood sugar levels is crucial for managing diabetes or prediabetes and maintaining overall health. This article breaks down everything you need to know about interpreting a blood sugar levels chart, including the different units of measurement (mg/dL and mmol/L), target ranges, and what to do if your levels are outside the normal range. We'll provide practical guidance to help you effectively monitor and manage your glucose levels for better health outcomes.

Understanding Blood Sugar Units: mg/dL vs. mmol/L

Before diving into the chart, it's essential to understand the two primary units used to measure blood sugar:

  • 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 countries, including Canada, the UK, and many European nations.

It's important to know which unit your testing device uses and to understand how to convert between the two if necessary. To convert mg/dL to mmol/L, divide the mg/dL value by 18. To convert mmol/L to mg/dL, multiply the mmol/L value by 18.

Normal Blood Sugar Levels Chart

The following table provides a general guideline for normal blood sugar levels. Keep in mind that these ranges may vary slightly depending on individual health conditions, age, and other factors. Consult with your healthcare provider to determine the specific target range that's right for you. This table uses the required HTML format.

Time Normal Blood Sugar Range (mg/dL) Normal Blood Sugar Range (mmol/L)
Fasting (after at least 8 hours of not eating) 70-99 mg/dL 3.9-5.5 mmol/L
2 Hours After Eating Less than 140 mg/dL Less than 7.8 mmol/L
HbA1c (Average over 2-3 months) Less than 5.7% N/A

Blood Sugar Levels for People with Diabetes

For individuals with diabetes, the target blood sugar levels are different from those without the condition. The following table outlines typical targets, but again, personalized targets should be established in consultation with your healthcare provider.

Time Target Blood Sugar Range for Diabetics (mg/dL) Target Blood Sugar Range for Diabetics (mmol/L)
Fasting (after at least 8 hours of not eating) 80-130 mg/dL 4.4-7.2 mmol/L
2 Hours After Eating Less than 180 mg/dL Less than 10.0 mmol/L
HbA1c (Average over 2-3 months) Less than 7% (Individualized targets may vary) N/A

Understanding High Blood Sugar (Hyperglycemia)

Hyperglycemia, or high blood sugar, occurs when your glucose levels are higher than the target range. Symptoms may include:

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

Causes of hyperglycemia can include:

  • Overeating
  • Lack of physical activity
  • Illness
  • Stress
  • Not taking enough insulin or oral diabetes medication

Related reading: The Top 20 Foods That Lower Blood Sugar According To Science

Managing Hyperglycemia:

  • Check your blood sugar more frequently.
  • Adjust your diet, focusing on smaller portions and lower carbohydrate intake.
  • Engage in physical activity (if appropriate and safe).
  • Adjust your medication as directed by your doctor.
  • Stay hydrated.

Understanding Low Blood Sugar (Hypoglycemia)

Hypoglycemia, or low blood sugar, occurs when your glucose levels drop too low. This is typically defined as below 70 mg/dL (3.9 mmol/L). Symptoms may include:

  • Shakiness
  • Sweating
  • Dizziness
  • Confusion
  • Rapid heartbeat
  • Hunger
  • Irritability

Causes of Hypoglycemia can include:

  • Taking too much insulin or oral diabetes medication
  • Skipping meals
  • Exercising strenuously without eating
  • Drinking alcohol

Managing Hypoglycemia:

  • Follow the 15-15 rule: Consume 15 grams of fast-acting carbohydrates (such as glucose tablets, juice, or regular soda), wait 15 minutes, and then check your blood sugar again. Repeat if necessary.
  • Once your blood sugar is back within the target range, eat a meal or snack to prevent another drop.
  • Carry a source of fast-acting carbohydrates with you at all times.

Factors Affecting Blood Sugar Levels

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

Related reading: Beyond Diet 7 Lifestyle Habits To Control Blood Sugar Effectively

Related reading: Hemoglobin A1C Explained Your Guide To A1C Levels And Charts

  • Diet: Carbohydrates have the greatest impact on blood sugar.
  • Physical Activity: Exercise can lower blood sugar levels.
  • Stress: Stress hormones can raise blood sugar.
  • Illness: Illness can affect blood sugar levels, sometimes increasing them.
  • Medications: Certain medications, including steroids, can affect blood sugar.
  • Hydration: Dehydration can increase blood sugar concentrations.
  • Time of Day: Hormonal changes throughout the day can affect blood sugar.

Tips for Monitoring and Managing Your Blood Sugar

  • Regularly monitor your blood sugar: Use a blood glucose meter to check your levels at home.
  • Keep a blood sugar log: Record your blood sugar readings, meals, physical activity, and medications to identify patterns.
  • Follow a healthy diet: Focus on whole foods, fruits, vegetables, and lean protein.
  • Exercise regularly: Aim for at least 30 minutes of moderate-intensity exercise most days of the week.
  • Manage stress: Practice relaxation techniques such as yoga or meditation.
  • Work closely with your healthcare provider: Discuss your blood sugar levels and adjust your treatment plan as needed.

The Importance of HbA1c

The HbA1c test provides a picture of your average blood sugar control over the past 2-3 months. It measures the percentage of your red blood cells that have glucose attached to them. The higher your HbA1c, the higher your average blood sugar levels have been. For most people with diabetes, the target HbA1c is less than 7%. This value represents an average blood glucose of approximately 154 mg/dL. HbA1c should be checked regularly, as recommended by your physician.

Conclusion

Understanding your blood sugar levels chart is a vital step in managing your health, whether you have diabetes or are simply aiming for optimal wellness. By knowing your target ranges, recognizing the signs of hyperglycemia and hypoglycemia, and implementing effective monitoring and management strategies, you can take control of your blood sugar and enjoy a healthier life. Always consult with your healthcare provider for personalized guidance and treatment. Regularly monitoring blood glucose levels is a fundamental part of managing diabetes and maintaining good health.