Blood Sugar Converter Calculator

Category: Diabetes
- April 07, 2025
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Convert blood glucose values between mg/dL and mmol/L units. This calculator provides instant conversion for diabetes management and international reference.

Blood Glucose Conversion

mg/dL
OR
mmol/L

Display Options

Conversion Result

mg/dL Value
100
mg/dL
mmol/L Value
5.6
mmol/L

Conversion Formula

mg/dL to mmol/L:
mmol/L = mg/dL ÷ 18.0182
mmol/L to mg/dL:
mg/dL = mmol/L × 18.0182

The conversion factor 18.0182 is based on the molecular weight of glucose and is the standard factor used in medical conversions.

Common Values Reference Table

Blood Glucose Level mg/dL mmol/L
Low (Hypoglycemia) < 70 < 3.9
Normal Fasting (Non-diabetic) 70 - 99 3.9 - 5.5
Prediabetes (Fasting) 100 - 125 5.6 - 6.9
Diabetes (Fasting) ≥ 126 ≥ 7.0
Target Range (Diabetic) 80 - 180 4.4 - 10.0
High (Hyperglycemia) > 180 > 10.0

Note: Target ranges may vary based on individual factors and medical advice.

About Blood Glucose Units

Blood glucose (blood sugar) concentration is measured in different units worldwide. The United States, Japan, and several other countries use milligrams per deciliter (mg/dL), while the United Kingdom, Canada, Australia, and most of Europe use millimoles per liter (mmol/L).

Why Different Units?

The mg/dL unit measures the weight of glucose in a specific volume of blood, while mmol/L represents the number of glucose molecules in that volume. Healthcare professionals use these measurements to assess diabetes management, diagnose conditions, and adjust treatment plans.

When You Need Conversion
  • Traveling to countries that use different units
  • Reading international medical literature or research
  • Using glucose meters or continuous glucose monitors with different unit settings
  • Communicating with healthcare providers who use different units

Disclaimer: This calculator is provided for educational and reference purposes only. Always consult with your healthcare provider regarding blood glucose readings and diabetes management.

Conversion Formulas:
  • mg/dL to mmol/L: mmol/L = mg/dL ÷ 18.0182
  • mmol/L to mg/dL: mg/dL = mmol/L × 18.0182

What Is the Blood Sugar Converter Calculator?

The Blood Sugar Converter Calculator is a practical tool that helps you convert blood glucose values between mg/dL and mmol/L — the two most common units used across different regions of the world. Whether you are using medical literature, glucose monitors, or discussing readings with healthcare providers internationally, this sugar level conversion tool ensures accurate interpretation of blood sugar measurements.

It supports diabetes management by allowing easy unit conversion, which is essential for interpreting lab results, adjusting treatment plans, and tracking glucose levels over time.

Why Use This Calculator?

Different countries use different units to express blood sugar levels:

  • mg/dL – Used in the US, Japan, and some other regions
  • mmol/L – Common in the UK, Canada, Australia, and most of Europe

This calculator helps bridge that gap by instantly converting values between these systems, using the medically accepted conversion factor of 18.0182.

How to Use the Blood Sugar Conversion Tool

Follow these simple steps:

  • Enter your value in either the mg/dL or mmol/L input field.
  • Click the button to convert to the other unit.
  • Select how many decimal places you’d like to display for mmol/L values.
  • Optionally, view the formula used for the conversion.
  • Click “Clear Values” to reset the inputs and results.

The result section shows both values side-by-side for easy comparison. A reference table is also available to help you understand what your blood sugar level means.

How This Calculator Can Help You

The blood sugar converter plays a key role in diabetes tracking and daily health monitoring. It can help:

  • Improve your understanding of test results from different regions.
  • Support communication with doctors using a different unit system.
  • Enhance personal health logging, especially when using glucose meters with unit settings that differ from your region's standard.

It is a valuable companion to other tools such as an A1C Calculator, HOMA-IR assessment tools, and estimated glucose to A1C converters — all of which contribute to better glycemic control and diabetes management.

Frequently Asked Questions (FAQ)

What is the difference between mg/dL and mmol/L?

mg/dL measures the weight of glucose in a deciliter of blood, while mmol/L measures the number of glucose molecules in a liter of blood. They are simply different ways of expressing the same thing.

Why do I need to convert blood sugar units?

You may need to convert values when reading international lab reports, using imported glucose meters, or discussing results with a medical team that uses a different system.

Can this calculator help estimate my A1C?

While this specific calculator is for unit conversion, tools like an Estimated Average Glucose (eAG) to A1C Calculator are used to convert eAG to A1C and assess long-term blood sugar trends. They are closely related and often used together.

Is the conversion formula accurate?

Yes. The calculator uses the standard medical formula based on the molecular weight of glucose: 1 mmol/L = 18.0182 mg/dL. This is the same formula used by healthcare professionals and labs worldwide.

Additional Insight for Diabetes Tools Users

This converter pairs well with tools like the HOMA-IR index calculator for insulin resistance, the QUICKI measurement tool for checking insulin sensitivity, and blood sugar estimators that calculate HbA1c from average glucose levels.

If you're also using a glycemic index checker or glycemic load calculator, understanding blood sugar units becomes even more important. These tools work together to offer better insights into your overall glucose profile.

Disclaimer

This calculator is intended for general information and educational purposes only. Always consult with your healthcare provider before making any decisions about your blood glucose or diabetes treatment.