The Ultimate Blood Sugar Levels Chart (mg/dL & mmol/L Conversion) Understanding your blood sugar levels is crucial for maintaining good health, es...
The Ultimate Blood Sugar Levels Chart (mg/dL & mmol/L Conversion)
Understanding your blood sugar levels is crucial for maintaining good health, especially if you have diabetes or are at risk of developing it. This comprehensive guide provides a detailed blood sugar levels chart in both mg/dL (milligrams per deciliter) and mmol/L (millimoles per liter), along with practical insights into what these numbers mean for you. We'll cover normal ranges, what to do if your blood sugar is too high or too low, and essential information for managing your health effectively.
Why Monitoring Blood Sugar Levels is Important
Regular monitoring of your blood glucose levels allows you to understand how your body responds to food, exercise, and medication. It's an essential part of diabetes management and helps prevent serious complications like:
- Heart Disease
- Kidney Disease
- Nerve Damage (Neuropathy)
- Vision Loss (Retinopathy)
By tracking your levels, you can make informed decisions about your diet and lifestyle, ensuring you stay within a healthy range. This ultimately leads to improved well-being and a reduced risk of long-term health problems.
Related reading: What Should My Blood Sugar Be A Guide For Adults Without Diabetes
Related reading: Stabilize Your Blood Sugar To Avoid Energy Spikes And Crashes

Blood Sugar Levels Chart: mg/dL and mmol/L Conversion
This chart provides a quick reference for understanding your blood glucose levels at different times of the day. Remember, these are general guidelines, and your doctor may recommend slightly different targets based on your individual health needs.
Category | mg/dL (Fasting) | mmol/L (Fasting) | mg/dL (2-Hour Postprandial) | mmol/L (2-Hour 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 |
Key Terms:
- Fasting Blood Sugar: Measured after at least eight hours of no eating.
- 2-Hour Postprandial Blood Sugar: Measured two hours after starting a meal.
Understanding mg/dL vs. mmol/L
mg/dL and mmol/L are two different units used to measure blood sugar levels. In the United States, mg/dL is the standard unit, while mmol/L is more commonly used in other parts of the world, including Canada and Europe. The conversion formula is:
- mg/dL = mmol/L x 18
- mmol/L = mg/dL / 18
Being familiar with both units ensures you can understand and interpret your results, regardless of where you are or the type of meter you use. Understanding this blood sugar conversion is key for international travel or research.
What to Do If Your Blood Sugar Is Too High (Hyperglycemia)
Hyperglycemia occurs when your blood glucose levels are too high. Symptoms may include:
- Frequent urination
- Increased thirst
- Blurred vision
- Fatigue
If you experience these symptoms, check your blood sugar. If it's consistently above your target range, take the following steps:
- Drink Plenty of Water: This helps flush out excess sugar.
- Check Your Medication: Ensure you're taking the correct dose at the right time.
- Exercise (If Appropriate): Physical activity can help lower blood sugar, but avoid exercise if you have ketones in your urine, as this could indicate a more serious condition (diabetic ketoacidosis).
- Contact Your Healthcare Provider: If your blood sugar remains high despite these measures, seek medical advice.
- Consider Adjusting Your Diet: Limit simple carbohydrates and sugary foods.
What to Do If Your Blood Sugar Is Too Low (Hypoglycemia)
Hypoglycemia occurs when your blood glucose levels are too low. Symptoms may include:
- Shakiness
- Sweating
- Dizziness
- Confusion
- Irritability
If you experience these symptoms, check your blood sugar immediately. If it's below 70 mg/dL (3.9 mmol/L), take the following steps:
- Follow the 15-15 Rule: Consume 15 grams of fast-acting carbohydrates (such as glucose tablets, fruit juice, or regular soda) and wait 15 minutes.
- Recheck Your Blood Sugar: If it's still low, repeat the 15-15 rule.
- Eat a Meal or Snack: Once your blood sugar is back to a safe level, eat a meal or snack to prevent it from dropping again.
- Contact Your Healthcare Provider: Discuss any frequent episodes of hypoglycemia with your doctor. They may need to adjust your medication or meal plan.
- Carry a Source of Fast-Acting Carbohydrates: Always have glucose tablets or another readily available source of sugar with you.
Factors Affecting Blood Sugar Levels
Many factors can influence your blood glucose levels. Being aware of these factors can help you manage your condition more effectively:
- Diet: The type and amount of food you eat significantly impact blood sugar. High-carbohydrate foods, especially simple sugars, can cause rapid spikes.
- Exercise: Physical activity can lower blood sugar as your body uses glucose for energy. However, intense exercise can sometimes raise blood sugar temporarily due to the release of stress hormones.
- Medications: Insulin and other diabetes medications can lower blood sugar. Other medications, such as steroids, can raise it.
- Stress: Stress hormones can increase blood sugar.
- Illness: Your body releases hormones to fight illness, which can also raise blood sugar.
- Dehydration: Dehydration can concentrate your blood, leading to higher blood sugar readings.
- Menstrual Cycle: Hormonal changes during menstruation can affect blood sugar levels.
- Alcohol: Alcohol can initially lower blood sugar but may lead to a rebound effect later.
- Sleep: Poor sleep can affect hormone levels and insulin sensitivity, impacting blood sugar.
Tips for Maintaining Healthy Blood Sugar Levels
Related reading: Understanding Blood Glucose Levels For Non Diabetics
Maintaining stable blood glucose levels is essential for overall health and preventing complications. Here are some practical tips:
- Eat a Balanced Diet: Focus on whole foods, including fruits, vegetables, lean proteins, and whole grains. Limit processed foods, sugary drinks, and saturated fats.
- Monitor Carbohydrate Intake: Work with a dietitian to determine the appropriate amount of carbohydrates for your individual needs.
- Exercise Regularly: Aim for at least 150 minutes of moderate-intensity aerobic exercise per week, along with strength training exercises.
- Stay Hydrated: Drink plenty of water throughout the day.
- Manage Stress: Practice relaxation techniques such as meditation, yoga, or deep breathing.
- Get Enough Sleep: Aim for 7-9 hours of quality sleep per night.
- Monitor Your Blood Sugar Regularly: Check your blood sugar as directed by your healthcare provider.
- Take Medications as Prescribed: Adhere to your medication schedule and dosage instructions.
- Attend Regular Check-ups: See your doctor and other healthcare professionals for routine check-ups and screenings.
- Keep a Blood Sugar Log: Record your blood glucose readings to identify patterns and inform decisions.
The Importance of A1C Testing
The A1C test, also known as the hemoglobin A1c test, provides an average of your blood sugar levels over the past 2-3 months. It's a crucial tool for monitoring long-term blood glucose control. Unlike a daily blood sugar reading, the A1C test gives a broader picture of your overall management. The results are presented as a percentage, and the target A1C level for most people with diabetes is below 7%. Your doctor will advise on the frequency of this test based on your specific needs.
Continuous Glucose Monitoring (CGM)
Continuous Glucose Monitoring (CGM) systems provide real-time blood glucose readings throughout the day and night. A small sensor inserted under the skin measures glucose levels in interstitial fluid. CGM devices can alert you to high or low blood sugar levels, helping you take proactive steps to stay within your target range. They can also provide valuable insights into how your blood sugar responds to different foods, activities, and medications.
Conclusion
Understanding and managing your blood sugar levels is essential for maintaining good health. By using the blood sugar levels chart, adopting healthy lifestyle habits, and working closely with your healthcare team, you can effectively control your blood glucose and reduce your risk of complications. Remember that this blood sugar levels chart is for informational purposes only and does not constitute medical advice. Always consult with your healthcare provider for personalized recommendations.