How do I convert mg/dL to mmol/L?

To convert mg/dL to mmol/L, divide the mg/dL value by 18. For example: 108 mg/dL ÷ 18 = 6.0 mmol/L. To convert mmol/L to mg/dL, multiply the mmol/L value by 18. For example: 6.0 mmol/L × 18 = 108 mg/dL.

What are normal blood sugar ranges?

Fasting (no caloric intake for at least 8 hours): 70-99 mg/dL (3.9-5.5 mmol/L). Post-meal (1-2 hours after eating): less than 140 mg/dL (7.8 mmol/L) for people without diabetes. These ranges may vary by individual and medical guidance.

Blood Sugar Unit Converter

Instantly convert blood glucose readings between milligrams per deciliter (mg/dL) and millimoles per liter (mmol/L) with clinical reference benchmarks.

Enter a value: and choose the unit below to convert both directions automatically

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mg/dL

Reference Ranges

Fasting (8+ hours) 70-99 mg/dL (3.9-5.5 mmol/L)

Post-meal (1-2 hours) < 140 mg/dL (< 7.8 mmol/L)

What Is a Blood Sugar Unit Converter?

A Blood Sugar Unit Converter is a metabolic screening and unit translation tool designed to help individuals understand glycemic parameters and long-term blood glucose regulation. It allows users to convert laboratory measurements across international reporting standards or assess evidence-based Type 2 diabetes risk markers. This tool is designed strictly for educational awareness and lifestyle planning; it does not provide medical diagnosis or calculate insulin or pharmaceutical dosages.

How to Use This Calculator

Choose your input unit (mg/dL or mmol/L).
Type your blood glucose measurement.
View the instant two-way converted value alongside standard fasting and post-meal clinical guidelines.

How This Calculator Works

Because glucose has a molecular weight of 180.16 g/mol, the mathematical conversion between the mass-concentration unit (mg/dL) and the molar-concentration unit (mmol/L) is: $\text{mmol/L} = \frac{\text{mg/dL}}{18.0182}$ and $\text{mg/dL} = \text{mmol/L} \times 18.0182$.

Understanding Your Results

Normal fasting plasma glucose is 70 to 99 mg/dL (3.9 to 5.5 mmol/L). Fasting glucose of 100 to 125 mg/dL (5.6 to 6.9 mmol/L) reflects impaired fasting glucose (prediabetes). Fasting glucose of 126 mg/dL (7.0 mmol/L) or higher warrants clinical evaluation for diabetes.

Frequently Asked Questions

Which countries use mg/dL vs mmol/L?

The United States, Japan, France, Germany, and Egypt predominantly use mg/dL. The United Kingdom, Canada, Australia, and most European and Commonwealth nations use mmol/L as the international standard (SI).

What is a normal postprandial (post-meal) blood sugar reading?

For non-diabetic adults, blood glucose typically peaks under 140 mg/dL (7.8 mmol/L) one to two hours after starting a meal. The ADA target for adults with diabetes is under 180 mg/dL (10.0 mmol/L) post-meal.

What reading constitutes clinical hypoglycemia?

Hypoglycemia is clinically defined as blood glucose below 70 mg/dL (3.9 mmol/L), requiring prompt treatment with fast-acting carbohydrates (the 15-15 rule).

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Important Limitations & Medical Disclaimer

Notice: Blood sugar unit conversions are purely mathematical references. Never adjust medication, insulin therapy, or treatment regimens without medical consultation from your healthcare team.