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

04 Sep 2025 by Aoife M. Egan, M.B., B.Ch., Ph.D.

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

Maintaining healthy blood sugar levels is crucial for overall well-being, especially for individuals with diabetes or those at risk. Understanding your blood sugar levels chart is the first step in managing your health. This article provides a comprehensive overview of normal blood sugar ranges, variations in mg/dL and mmol/L, and what those numbers mean for you. The Dawn Phenomenon Why Your Morning Blood Sugar Level Is High

Why is Monitoring Blood Sugar Levels Important?

Blood sugar, or glucose, is the main sugar found in your blood and comes from the food you eat. Your body uses glucose for energy. Maintaining stable blood glucose levels is vital because both high (hyperglycemia) and low (hypoglycemia) blood sugar can have serious health consequences. Regular monitoring helps:

  • Prevent long-term complications associated with diabetes (e.g., nerve damage, kidney disease, heart disease).
  • Identify patterns and trends to adjust diet, exercise, and medication accordingly.
  • Provide insights into how different foods and activities affect your blood sugar.
  • Ensure timely intervention if levels become dangerously high or low.

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

Blood sugar levels are measured in two main units: milligrams per deciliter (mg/dL) and millimoles per liter (mmol/L). The United States primarily uses mg/dL, while many other countries use mmol/L. Normal Blood Sugar Range For Adults Your Guide To Fasting Amp Post Meal Levels

  • mg/dL (milligrams per deciliter): This is the standard unit in the United States. It indicates the weight of glucose in a specific volume of blood.
  • mmol/L (millimoles per liter): This unit is commonly used internationally. It represents the number of molecules of glucose in a specific volume of blood.

Converting between the two is straightforward:

  • 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.

For example:

  • 100 mg/dL = 5.6 mmol/L (approximately)
  • 7.0 mmol/L = 126 mg/dL (approximately)

Blood Sugar Levels Chart: Target Ranges

Here's a breakdown of generally accepted target blood glucose levels for people with and without diabetes. It's crucial to consult with your healthcare provider to determine the best target range for your individual needs. Remember, these are general guidelines, and your individual targets may vary based on factors such as age, medical conditions, and medications.

Category Target Blood Sugar (mg/dL) Target Blood Sugar (mmol/L)
Fasting (before a meal) - People without diabetes 70-99 mg/dL 3.9-5.5 mmol/L
Fasting (before a meal) - People with diabetes 80-130 mg/dL 4.4-7.2 mmol/L
2 hours after a meal - People without diabetes Less than 140 mg/dL Less than 7.8 mmol/L
2 hours after a meal - People with diabetes Less than 180 mg/dL Less than 10.0 mmol/L
HbA1c (average over 2-3 months) - People without diabetes Less than 5.7% N/A
HbA1c (average over 2-3 months) - People with diabetes Less than 7.0% (as recommended by the American Diabetes Association) N/A

Important Notes:

  • Fasting blood sugar is measured after at least 8 hours of fasting (no food or drinks, except water).
  • Postprandial blood sugar is measured 1-2 hours after starting a meal.
  • HbA1c provides an average of your blood sugar levels over the past 2-3 months. While HbA1c is expressed as a percentage, it reflects an average glucose value.

Understanding High and Low Blood Sugar Levels

Knowing the target ranges is important, but understanding the implications of high and low blood sugar levels is equally critical. Prediabetes Diet Plan 21 Blood Sugar Friendly Meals To Try

Hyperglycemia (High Blood Sugar)

Hyperglycemia occurs when your blood sugar is too high. Symptoms can include:

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

If left untreated, high blood sugar can lead to serious complications such as:

  • Diabetic Ketoacidosis (DKA): A life-threatening condition that occurs when your body doesn't have enough insulin.
  • Hyperosmolar Hyperglycemic State (HHS): Another serious condition characterized by extremely high blood sugar and dehydration.
  • Long-term damage to organs like the kidneys, nerves, and eyes.

Hypoglycemia (Low Blood Sugar)

Hypoglycemia occurs when your blood sugar is too low. Symptoms can include:

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

If left untreated, low blood sugar can lead to:

  • Seizures
  • Loss of consciousness
  • Coma

Action Steps for Hypoglycemia: If you experience symptoms of low blood sugar, immediately consume a fast-acting carbohydrate source such as:

  • Glucose tablets
  • Fruit juice
  • Hard candy

Test your blood glucose level after 15 minutes, and repeat if necessary.

Factors Affecting Blood Sugar Levels

Numerous factors can influence your blood sugar levels, including:

  • Diet: The type and amount of carbohydrates you consume have a significant impact.
  • Physical Activity: Exercise can lower blood sugar.
  • Medications: Insulin and other diabetes medications affect blood sugar.
  • Stress: Stress hormones can raise blood sugar.
  • Illness: Infections can increase blood sugar levels.
  • Menstrual Cycle: Hormonal changes during menstruation can affect blood sugar in women.
  • Dehydration: Dehydration can concentrate glucose in the blood, leading to higher readings.
  • Time of Day: Blood sugar can fluctuate naturally throughout the day.

Tools for Monitoring Blood Sugar

Several tools are available for monitoring blood sugar levels:

  • Blood Glucose Meter (glucometer): Requires a small blood sample, typically from a fingertip.
  • Continuous Glucose Monitor (CGM): A small sensor inserted under the skin that continuously tracks glucose levels. Provides real-time data and trends.
  • Urine Glucose Testing: Less accurate than blood glucose testing and not commonly used.

Tips for Maintaining Healthy Blood Sugar Levels

  • Follow a balanced diet: Focus on whole, unprocessed foods. Limit sugary drinks and processed carbohydrates.
  • Engage in regular physical activity: 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 testing frequency.
  • Take medications as prescribed: Don't skip doses or adjust your medication without consulting your doctor.
  • Manage stress: Practice relaxation techniques like yoga or meditation.
  • Stay hydrated: Drink plenty of water throughout the day.
  • Get enough sleep: Aim for 7-8 hours of quality sleep per night.
  • Work closely with your healthcare team: Develop a personalized diabetes management plan.

Conclusion

Understanding your blood sugar levels chart, whether in mg/dL or mmol/L, is a critical component of managing your health, especially if you have diabetes. By regularly monitoring your blood glucose, being aware of the factors that affect it, and adopting healthy lifestyle habits, you can maintain stable blood sugar levels and reduce your risk of complications. Always consult with your healthcare provider to determine the best course of action for your individual needs. Managing your blood sugar effectively empowers you to live a healthier, more fulfilling life.

References and Further Reading