Post Time: 2025-09-01

Blood Sugar mg/dL to mmol/L: A Simple Conversion & Chart for Everyone

Understanding your blood sugar levels is critical for managing diabetes and maintaining overall health. Often, blood sugar is measured in either milligrams per deciliter (mg/dL) or millimoles per liter (mmol/L), depending on where you are in the world and the testing equipment used. This article provides a straightforward explanation of the conversion process from mg/dL to mmol/L, along with a handy conversion chart to make it easy for anyone to understand their readings. We'll also touch on why this conversion is important, and what normal and abnormal blood sugar levels look like.

Why Understanding Blood Sugar Conversion is Important

Whether you're managing diabetes, monitoring your health as a precaution, or simply curious about blood sugar levels, understanding the units of measurement is paramount. Different countries and different meters use different units, primarily mg/dL (commonly used in the United States) and mmol/L (commonly used in many other countries, including Canada and the UK). Without knowing how to convert between these units, interpreting your blood glucose results can be confusing and even dangerous. This knowledge empowers you to:

• Accurately track your readings across different regions or devices.
• Effectively communicate your blood sugar levels to healthcare professionals, regardless of where they are located or the unit system they are using.
• Make informed decisions about your diet, medication, and exercise routines to better manage your blood sugar.

The Simple Formula for Conversion: mg/dL to mmol/L

Converting blood sugar readings from mg/dL to mmol/L is remarkably straightforward. The formula is:

mmol/L = mg/dL ÷ 18

Therefore, to convert your mg/dL value into mmol/L, simply divide your mg/dL reading by 18. Let's look at some examples:

• If your blood sugar level is 100 mg/dL, the equivalent in mmol/L is 100 ÷ 18 = 5.56 mmol/L (approximately).
• If your blood sugar level is 180 mg/dL, the equivalent in mmol/L is 180 ÷ 18 = 10 mmol/L.

Quick Conversion Chart: mg/dL to mmol/L

To further simplify the process, here is a blood sugar conversion chart that presents common mg/dL readings and their corresponding mmol/L values. This chart serves as a quick reference guide for understanding your blood sugar numbers at a glance.

mg/dL (Milligrams per Deciliter)	mmol/L (Millimoles per Liter)
70	3.9
80	4.4
90	5.0
100	5.6
110	6.1
120	6.7
130	7.2
140	7.8
150	8.3
160	8.9
170	9.4
180	10.0
190	10.6
200	11.1
250	13.9
300	16.7

Please note that these are approximate conversions and may vary slightly.

Understanding Normal Blood Sugar Levels

Knowing what's considered a normal blood sugar range is vital. This can vary slightly depending on individual factors such as age and specific health conditions. The following ranges are generally accepted guidelines:

• Fasting Blood Sugar (After at least 8 hours of not eating):
  • Normal: Less than 100 mg/dL (5.6 mmol/L)
  • Prediabetes: 100 to 125 mg/dL (5.6 to 6.9 mmol/L)
  • Diabetes: 126 mg/dL (7.0 mmol/L) or higher
• 2 Hours After Eating (Postprandial):
  • Normal: Less than 140 mg/dL (7.8 mmol/L)
  • Prediabetes: 140 to 199 mg/dL (7.8 to 11.0 mmol/L)
  • Diabetes: 200 mg/dL (11.1 mmol/L) or higher

It is essential to discuss your specific target ranges with your healthcare provider.

What to Do If Your Blood Sugar is High or Low

• High Blood Sugar (Hyperglycemia): High blood sugar can cause symptoms such as increased thirst, frequent urination, blurred vision, and fatigue. If you experience these symptoms, monitor your blood sugar more frequently, adjust your diet and exercise as directed by your healthcare provider, and take your medications as prescribed. Prolonged hyperglycemia can lead to serious complications.

• Low Blood Sugar (Hypoglycemia): Low blood sugar can cause symptoms such as shakiness, sweating, dizziness, confusion, and hunger. If you suspect your blood sugar is low (typically below 70 mg/dL or 3.9 mmol/L), consume a fast-acting carbohydrate source such as glucose tablets, fruit juice, or regular (non-diet) soda. Recheck your blood sugar after 15 minutes and repeat if necessary.

Important Note: This article provides general information and should not replace professional medical advice. Always consult with your doctor or a qualified healthcare provider for any questions you may have regarding your health and blood sugar management. They can provide personalized recommendations based on your individual needs and medical history.

Conclusion

Converting blood sugar readings between mg/dL and mmol/L is a fundamental skill for anyone managing their glucose levels. By using the simple formula or the conversion chart provided in this article, you can quickly and accurately understand your readings regardless of the units used. Remember to always consult with your healthcare provider for personalized advice and to establish target blood sugar ranges that are right for you. Taking control of your health involves understanding the numbers and using that knowledge to make informed decisions every day. Mastering the mg/dL to mmol/L conversion is a significant step towards that goal.

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