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Blood Sugar mg/dL to mmol/L Explained: A Simple Conversion Guide
16 Sep 2025 By Danielle M. Shilling, M.D.

Blood Sugar mg/dL to mmol/L Explained: A Simple Conversion Guide

Understanding your blood sugar levels is crucial for managing conditions like diabetes. Blood sugar is typically measured in either mg/dL (milligrams per deciliter) or mmol/L (millimoles per liter), depending on where you are in the world. This guide will help you easily convert between these two units, providing clarity for better health management. Let's dive in!

Why Two Different Units of Measurement?

The use of different units—mg/dL vs. mmol/L—stems from varying measurement standards across different regions. The United States, for example, commonly uses mg/dL, while many other countries around the world prefer mmol/L. Knowing how to convert between these units is vital if you’re traveling, communicating with healthcare professionals from different countries, or simply want to understand information presented in a different format.

The Conversion Factor: The Magic Number

The key to converting between blood glucose levels in mg/dL and mmol/L is the conversion factor.

  • 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.

This magic number "18" is derived from the molecular weight of glucose. Remember these simple rules, and you'll be converting blood sugar readings like a pro in no time! Surprising Foods That Actually Lower Blood Sugar

Example Conversions: Putting It Into Practice

Let's work through a few examples to solidify your understanding:

  1. Converting mg/dL to mmol/L:

    • If your blood sugar reading is 126 mg/dL, to convert it to mmol/L, divide 126 by 18.
    • 126 mg/dL ÷ 18 = 7 mmol/L
    • Therefore, 126 mg/dL is equivalent to 7 mmol/L.
  2. Converting mmol/L to mg/dL:

    • If your blood sugar reading is 5.5 mmol/L, to convert it to mg/dL, multiply 5.5 by 18.
    • 5.5 mmol/L x 18 = 99 mg/dL
    • Therefore, 5.5 mmol/L is equivalent to 99 mg/dL.

These examples illustrate the simple math involved. Practice with a few more numbers to get comfortable with the conversions.

Quick Conversion Chart: Your Go-To Reference

To make things even easier, here’s a handy conversion chart you can refer to:

mg/dL mmol/L
70 3.9
90 5.0
100 5.6
120 6.7
140 7.8
180 10.0
200 11.1

This chart provides a quick reference for common blood glucose measurements.

Normal Blood Sugar Ranges: What to Aim For

Understanding the units is one thing, but what are considered normal blood sugar ranges? Here’s a general guideline. Note: always consult with your doctor for personalized advice, as these ranges can vary based on individual health factors and age. What To Eat When Blood Sugar Is High To Bring It Down

Condition mg/dL mmol/L
Fasting (Normal) Less than 100 Less than 5.6
Fasting (Prediabetes) 100 to 125 5.6 to 6.9
Fasting (Diabetes) 126 or higher 7.0 or higher
2 hours after meal (Normal) Less than 140 Less than 7.8
2 hours after meal (Diabetes) 180 or higher 10.0 or higher

When to Consult a Healthcare Professional

While this guide helps you understand the blood sugar conversion process, it’s not a substitute for professional medical advice. If you have concerns about your blood sugar levels or are experiencing symptoms of diabetes, it’s essential to consult with a healthcare provider. They can provide personalized guidance and create a treatment plan tailored to your specific needs.

Online Conversion Tools: A Helpful Shortcut

There are many online conversion tools available that can quickly convert between mg/dL and mmol/L. While these tools are convenient, it's still helpful to understand the underlying conversion formula. This allows you to verify the results and develop a better understanding of your blood sugar readings. Decoding Your A1C Levels A Guide To The Prediabetes Range And Beyond

Conclusion: Empowering You with Knowledge

Understanding the conversion between mg/dL and mmol/L empowers you to take better control of your health. Whether you’re managing diabetes or simply staying informed, knowing how to convert between these units is a valuable skill. Use this guide as a reference, and always consult with your healthcare provider for personalized medical advice. Stay informed, stay healthy! Remember the formula and the information about blood glucose levels and you will be ready for success!

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