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Blood Sugar mg/dL to mmol/L: A Simple Guide to Your Test Results

04 Sep 2025 by Tina Ardon, M.D., FAAFP

Blood Sugar mg/dL to mmol/L: A Simple Guide to Your Test Results

Understanding your blood sugar levels is crucial for managing your health, especially if you have diabetes or are at risk of developing it. Blood sugar, or glucose, is measured in different units worldwide. In the United States, mg/dL (milligrams per deciliter) is commonly used, while many other countries use mmol/L (millimoles per liter). This article will provide a simple guide to converting between these units, interpreting your test results, and understanding what they mean for your health.

Why Are Blood Sugar Levels Important?

Maintaining healthy blood sugar levels is essential because glucose is the primary source of energy for your body's cells. When your blood sugar is too high (hyperglycemia) or too low (hypoglycemia), it can lead to various health problems. What Is Hypoglycemia The Signs And Dangers Of Low Blood Sugar

  • Hyperglycemia (High Blood Sugar): Over time, high blood sugar can damage blood vessels, nerves, and organs, increasing the risk of heart disease, kidney disease, vision problems, and nerve damage.
  • Hypoglycemia (Low Blood Sugar): Low blood sugar can cause symptoms like shakiness, dizziness, confusion, and even loss of consciousness if left untreated.

Regular monitoring of your blood sugar levels and understanding what they mean is vital for preventing these complications.

Understanding mg/dL and mmol/L

  • mg/dL (Milligrams per Deciliter): This is the standard unit of measurement for blood glucose in the United States. It indicates the concentration of glucose in a specific volume of blood.
  • mmol/L (Millimoles per Liter): This is the standard unit used in many other countries. It represents the number of moles of glucose in a liter of blood.

Converting mg/dL to mmol/L and Vice Versa

Knowing how to convert between these units is helpful, especially if you travel internationally or encounter different units in medical literature. Symptoms Of High Blood Sugar Hyperglycemia You Can T Afford To Ignore

  • Converting mg/dL to mmol/L: Divide the mg/dL value by 18.
    • Formula: mmol/L = mg/dL / 18
  • Converting mmol/L to mg/dL: Multiply the mmol/L value by 18.
    • Formula: mg/dL = mmol/L x 18

Example: If your blood sugar level is 100 mg/dL, the equivalent in mmol/L is: 100 mg/dL / 18 = 5.56 mmol/L Fasting Blood Sugar In The Prediabetes Range Here S Your Action Plan

If your blood sugar level is 7 mmol/L, the equivalent in mg/dL is: 7 mmol/L x 18 = 126 mg/dL

Normal Blood Sugar Ranges

What's considered a normal blood sugar range can vary slightly depending on the source, but generally, these are the recommended targets:

Category mg/dL mmol/L
Fasting Blood Sugar (Before Breakfast) 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% (This is a percentage, not mg/dL or mmol/L) Less than 5.7% (This is a percentage, not mg/dL or mmol/L)
  • Fasting Blood Sugar: Measured after an overnight fast (usually 8 hours). It's a good indicator of how well your body is regulating blood sugar overnight.
  • Postprandial Blood Sugar: Measured 1-2 hours after eating. It shows how your body responds to glucose from food.
  • HbA1c: This test provides an average of your blood sugar levels over the past 2-3 months. It gives a broader picture of your blood sugar control than a single measurement.

What If Your Blood Sugar Levels Are Outside the Normal Range?

If your blood sugar levels are consistently outside the normal range, it’s essential to consult with your doctor. Depending on your specific situation, they may recommend:

  • Lifestyle Changes: Diet modification (reducing sugary foods and refined carbohydrates), regular exercise, and weight management.
  • Medication: Oral medications or insulin injections to help regulate blood sugar.
  • Regular Monitoring: Frequent blood sugar testing to track your levels and make adjustments to your treatment plan as needed.

Tips for Managing Blood Sugar Levels

  • Eat a Balanced Diet: Focus on whole foods, including fruits, vegetables, lean proteins, and whole grains.
  • Exercise Regularly: Aim for at least 30 minutes of moderate-intensity exercise most days of the week.
  • Monitor Your Blood Sugar Regularly: Follow your doctor's recommendations for frequency and timing of blood sugar tests.
  • Stay Hydrated: Drink plenty of water throughout the day.
  • Manage Stress: Practice stress-reducing techniques like meditation, yoga, or deep breathing exercises.
  • Get Enough Sleep: Aim for 7-8 hours of quality sleep each night.
  • Work Closely with Your Healthcare Team: Communicate any concerns or changes in your health to your doctor or diabetes educator.

Conclusion

Understanding the relationship between blood sugar mg/dL and mmol/L, interpreting your test results, and taking proactive steps to manage your blood sugar are crucial for maintaining good health. By following the guidance in this article and working closely with your healthcare provider, you can effectively manage your blood sugar levels and reduce your risk of diabetes-related complications. Regular blood sugar monitoring is key to understanding how your body reacts to food, exercise, and medication, allowing for personalized management and a healthier life.

References and Further Reading