Blood Sugar Converter: Instantly Convert mg/dL and mmol/L

Understanding Blood Sugar Units

Managing diabetes effectively requires accurate blood glucose monitoring. Since blood sugar readings can be displayed in different units depending on where you live, using a blood sugar converter is essential for easy and reliable conversion between mg/dL (milligrams per deciliter) and mmol/L (millimoles per liter).

Blood‑Sugar Converter

How to Convert Blood Sugar Levels

mg/dL to mmol/L: Divide by 18.
mmol/L to mg/dL: Multiply by 18.

Understanding this conversion is crucial for interpreting your blood glucose results, especially when consulting international resources or traveling.

Why Blood Sugar Measurement Units Vary

mg/dL is commonly used in the United States and a few other countries.
mmol/L is standard in most of the world, including Europe, Australia, and Canada.

This variation highlights the importance of knowing how to quickly convert blood sugar readings for medical consultations, dietary adjustments, and insulin dosing.

Recommended Blood Sugar Ranges

Condition mmol/L Range mg/dL Range
Normal (fasting) 4.0 – 5.4 72 – 99
Diabetes (diagnosed) > 7.0 > 126
Ideal after meals (non‑diabetic) < 7.8 < 140
Target for diabetics (after meals) 4.0 – 8.0 72 – 144

Note: Targets may vary based on age, pregnancy, and individual health circumstances. Always consult your healthcare provider.

Why Accurate Blood Sugar Monitoring Matters

  • Prevent serious complications like hypoglycemia and hyperglycemia.
  • Fine‑tune diet, exercise, and medication plans.
  • Detect trends early to adjust your diabetes management.

Blood Sugar Monitoring Tips

  • Use a reliable blood glucose meter.
  • Record your readings in a logbook or app.
  • Test at consistent times, especially before meals and bedtime.
  • Stay hydrated – dehydration can skew readings.
  • Calibrate your device regularly if needed.

FAQ: Blood Sugar Conversion and Management

  1. How do I convert blood sugar from mg/dL to mmol/L?
    Simply divide the mg/dL value by 18. For example, 180 mg/dL ÷ 18 = 10 mmol/L.
  2. How do I convert mmol/L to mg/dL?
    Multiply the mmol/L value by 18. For instance, 7 mmol/L × 18 = 126 mg/dL.
  3. What is the normal blood sugar range?
    Fasting: 4.0 – 5.4 mmol/L (72 – 99 mg/dL)
    After meals: Below 7.8 mmol/L (140 mg/dL)
  4. What blood sugar level indicates diabetes?
    A fasting blood sugar of 7.0 mmol/L (126 mg/dL) or higher is typically used to diagnose diabetes.
  5. Why are blood sugar units different in different countries?
    Different regions use different units based on medical practice norms. The U.S. uses mg/dL, while most other countries use mmol/L.
  6. How often should I check my blood sugar?
    It depends on your treatment plan, but many people with diabetes check several times a day, especially before meals and bedtime.
Back to blog