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

04 Sep 2025 by M. Regina Castro, M.D.

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

Understanding your blood sugar readings is crucial for managing diabetes and maintaining overall health. Blood sugar levels are typically measured in either milligrams per deciliter (mg/dL) or millimoles per liter (mmol/L), depending on the region or the laboratory performing the test. If you're used to one unit and encounter the other, knowing how to convert between the two is essential. This guide provides a simple breakdown of blood sugar conversion. Fasting Blood Sugar Test Preparation Procedure And What Your Results Mean

Why Convert Blood Sugar Units?

Different countries and regions use different units to report blood glucose levels. The United States typically uses mg/dL, while Canada, Europe, and many other countries use mmol/L. If you travel internationally, consult medical information from a different country, or use apps and devices with different measurement preferences, you'll likely need to convert your blood sugar values. Understanding Your Blood Sugar Test Results Mg Dl And Mmol L Explained

The Conversion Formula: mg/dL to mmol/L

The formula for converting mg/dL to mmol/L is:

mmol/L = mg/dL ÷ 18

This means you simply divide the blood glucose level in mg/dL by 18 to get the equivalent value in mmol/L.

Example Conversion

Let's say your blood sugar reading is 126 mg/dL. To convert this to mmol/L, you would calculate: Is Your Normal Blood Sugar Actually Healthy A Deep Dive Into Ranges

mmol/L = 126 mg/dL ÷ 18 = 7 mmol/L

Therefore, 126 mg/dL is equal to 7 mmol/L.

The Conversion Formula: mmol/L to mg/dL

To convert from mmol/L back to mg/dL, you would use the following formula:

mg/dL = mmol/L × 18

This involves multiplying the blood sugar level in mmol/L by 18.

Example Conversion

If your blood glucose reading is 6 mmol/L, to convert it to mg/dL, you would calculate:

mg/dL = 6 mmol/L × 18 = 108 mg/dL

Thus, 6 mmol/L is equal to 108 mg/dL.

Quick Conversion Chart

While formulas are useful, a quick conversion chart can provide immediate reference, especially when checking your blood sugar.

mg/dL mmol/L
70 3.9
90 5.0
100 5.6
126 7.0
150 8.3
180 10.0
200 11.1
250 13.9

Understanding Healthy Blood Sugar Ranges

It's important not just to convert, but also to understand what the converted values mean for your health. Normal blood sugar levels vary depending on when you last ate and whether you have diabetes. Consult with your doctor to determine your personal target range. Generally speaking, for people without diabetes, these are considered normal glucose levels:

  • Fasting Blood Sugar: Less than 100 mg/dL (5.6 mmol/L)
  • 2 Hours After Eating: Less than 140 mg/dL (7.8 mmol/L)

For people with diabetes, targets might differ based on individual health circumstances and treatment plans.

Tools and Resources for Conversion

Several online tools and apps can help with blood sugar conversions. These resources can be particularly useful when you need a quick and accurate conversion. Search online for "mg/dL to mmol/L converter" or download a diabetes management app that includes a conversion function.

Important Considerations

  • Consistent Units: Stick to one unit of measurement (either mg/dL or mmol/L) as much as possible to avoid confusion.
  • Consult Your Doctor: Always discuss your blood sugar levels and target ranges with your healthcare provider. Don't rely solely on conversion charts or online tools for managing your diabetes.
  • Accuracy Matters: Ensure accurate blood glucose monitoring. Calibrate your meter regularly and follow the manufacturer's instructions.

By understanding how to convert between mg/dL and mmol/L, you can effectively manage your blood sugar and maintain better control of your health, regardless of where you are in the world. Knowing these conversions helps you understand your blood glucose meter readings and communicate effectively with healthcare professionals.

References and Further Reading