Blood Sugar Converter

What is Blood Sugar?

Blood sugar, or blood glucose, is the concentration of glucose circulating in your bloodstream. Glucose serves as your body's primary energy source, especially crucial for brain function. Medical professionals measure blood glucose to diagnose and manage diabetes, monitor treatment effectiveness, and ensure safe glucose levels during illness or medication changes.

Normal glucose regulation involves insulin production, cellular glucose uptake, and liver glucose storage. When this system functions properly, blood glucose remains within a narrow, healthy range. Disruption of this balance can lead to dangerous glucose elevations or drops, both potentially serious if not properly managed.

Understanding mmol/L and mg/dL

The global challenge with blood sugar measurement is that different countries use completely different units. This creates confusion for people with diabetes who travel internationally or encounter medical devices displaying unfamiliar numbers.

• mmol/L (millimoles per liter) - Used by most countries worldwide, including the UK, Canada, Australia, and most of Europe. This unit counts the number of glucose molecules per liter of blood and aligns with the International System of Units (SI).

• mg/dL (milligrams per deciliter) - Used primarily in the United States, along with Japan, Israel, and some Latin American countries. This unit measures the weight of glucose per deciliter (100 milliliters) of blood.

Both measurements provide identical clinical information, just expressed in different mathematical frameworks.

Conversion Formulas

The conversion between these units is straightforward:

• mmol/L to mg/dL: multiply by 18
• mg/dL to mmol/L: divide by 18

The factor comes from the molar mass of glucose, 180.16 g/mol: a millimole weighs 180.16 mg, and a liter is 10 deciliters. The exact factor is 18.016, but 18 is the one used in practice.

Example conversions:

• Normal fasting glucose: 5.0 mmol/L = 90 mg/dL
• Diabetes threshold: 7.0 mmol/L = 126 mg/dL
• Hypoglycemia: 3.9 mmol/L = 70 mg/dL

Quick recognition:

• mmol/L readings typically range from 3-20 with decimal points (like 5.4), while mg/dL readings range from 60-400 as whole numbers (like 95).

Blood sugar chart

Normal Blood Sugar Ranges

Healthy individuals:

• Fasting: 70-99 mg/dL (3.9-5.5 mmol/L)

Prediabetes:

• Fasting: 100-125 mg/dL (5.6-6.9 mmol/L)

Diabetes diagnosis:

• Fasting: ≥126 mg/dL (≥7.0 mmol/L) on two occasions
• Random with symptoms: ≥200 mg/dL (≥11.1 mmol/L)

Diabetes management targets:

• Before meals: 80-130 mg/dL (4.4-7.2 mmol/L)
• After meals: <180 mg/dL (10.0 mmol/L)

Medical Disclaimer: This information is for educational purposes only and should not replace professional medical advice. Always consult with healthcare providers for diabetes management decisions.