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Blood Sugar mg/dL to mmol/L: A Quick Conversion Guide for Your Results

04 Sep 2025 by Simon J. Laplante, M.D.

Blood Sugar mg/dL to mmol/L: A Quick Conversion Guide for Your Results

Understanding your blood sugar levels is essential for managing your health, especially if you have diabetes. However, blood sugar readings can be displayed in different units: mg/dL (milligrams per deciliter) and mmol/L (millimoles per liter). This article will provide a simple guide on how to convert between these two units, empowering you to understand your results better and take appropriate action. Blood Sugar Levels Decoding Mg Dl Vs Mmol L For Your Health

Why the Different Units?

Mg/dL is commonly used in the United States, while mmol/L is the standard unit in many other countries, including Canada and most of Europe. Both measure the concentration of glucose in your blood, just in different ways. Knowing how to convert between them is particularly useful if you travel internationally, use devices from different regions, or are simply trying to understand research published using a different unit. Decoding Your Test Results Blood Sugar Mg Dl Vs Mmol L Explained

The Simple Conversion Formula

The conversion between mg/dL and mmol/L is quite straightforward.

  • 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.

Formula:

  • mmol/L = mg/dL / 18
  • mg/dL = mmol/L * 18

Example Conversions

Let's walk through a few examples to illustrate the conversion process.

  • Example 1: Your blood sugar reading is 126 mg/dL. What is it in mmol/L?

    mmol/L = 126 mg/dL / 18 = 7 mmol/L

  • Example 2: Your blood sugar reading is 5.5 mmol/L. What is it in mg/dL?

    mg/dL = 5.5 mmol/L * 18 = 99 mg/dL

Quick Conversion Chart

Here’s a handy chart that provides common blood sugar readings in both units for easy reference. This is the required HTML format for tables:

mg/dL mmol/L Interpretation
70 3.9 Low Blood Sugar (Hypoglycemia)
100 5.6 Normal Blood Sugar (Fasting)
126 7.0 Diabetes (Fasting)
140 7.8 Normal Blood Sugar (2 hours after eating)
200 11.1 Diabetes (2 hours after eating)

Note: These interpretations are general guidelines. Always consult with your healthcare provider for personalized advice. What Is Postprandial Blood Sugar Why Your Levels After Eating Matter

Understanding Your Blood Sugar Levels

Beyond just converting the units, it's crucial to understand what your blood sugar levels mean. Here’s a general overview:

  • Normal Blood Sugar (Fasting): Less than 100 mg/dL (5.6 mmol/L)
  • Prediabetes (Fasting): 100 to 125 mg/dL (5.6 to 6.9 mmol/L)
  • Diabetes (Fasting): 126 mg/dL (7.0 mmol/L) or higher

  • Normal Blood Sugar (2 hours after eating): Less than 140 mg/dL (7.8 mmol/L)

  • Prediabetes (2 hours after eating): 140 to 199 mg/dL (7.8 to 11.0 mmol/L)
  • Diabetes (2 hours after eating): 200 mg/dL (11.1 mmol/L) or higher

If your blood sugar levels consistently fall outside the normal range, it's essential to consult with your doctor. They can perform further tests, diagnose any underlying conditions, and recommend a suitable treatment plan. Managing your blood glucose is a lifelong process.

Tools for Easy Conversion

Several online converters and mobile apps can perform the mg/dL to mmol/L conversion automatically. A simple search for "blood sugar converter" will reveal various options. These tools can be especially useful when you need to quickly convert values on the go. Some blood glucose meters also allow you to choose your preferred unit of measurement, which can eliminate the need for manual conversions altogether.

Key Takeaways for Blood Sugar Management

  • Master the Conversion: Know how to convert between mg/dL and mmol/L.
  • Understand Your Numbers: Recognize what your blood sugar levels indicate.
  • Consult Your Doctor: If you have concerns, seek professional medical advice.
  • Monitor Regularly: Consistent monitoring is critical for managing your blood glucose.
  • Use Available Tools: Utilize online converters and apps for convenience.

By understanding these principles and utilizing the simple conversion formula, you can effectively monitor your blood sugar levels, regardless of the units used, and take proactive steps to manage your health effectively. Remember that consistent monitoring and consulting with your healthcare provider are key to successful diabetes management.

References and Further Reading