Free Tool

Blood Sugar Converter: mg/dL ↔ mmol/L

Enter a value in either unit to instantly convert. See where your reading falls in the reference ranges below.

Converter

Enter 0 – 900 mg/dL

Enter 0 – 50 mmol/L

Blood Sugar Reference Ranges

Reference values based on ADA guidelines. These are for informational purposes only — always consult your healthcare provider.

Categorymg/dLmmol/L
Hypoglycemia
< 70< 3.9
Normal fasting
70 – 993.9 – 5.5
Prediabetes (fasting)
100 – 1255.6 – 6.9
Diabetes (fasting)
≥ 126≥ 7.0
Normal post-meal (2 h)
< 140< 7.8
High post-meal (2 h)
140 – 1997.8 – 11.0
Very high
≥ 200≥ 11.1

* Post-meal (2 h) thresholds apply after a standard glucose challenge or meal. Fasting values are measured after at least 8 hours without eating.

Glucoly – Blood Sugar Tracker

Log and track your readings in Glucoly

Glucoly accepts readings in both mg/dL and mmol/L, stores your full history, and shows color-coded trends. Free on iPhone and Android.

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mg/dL vs mmol/L: What's the Difference?

mg/dL (milligrams per deciliter) is the standard unit used in the United States, while mmol/L (millimoles per liter) is used in most other countries including the UK, Canada, and Australia. Both measure exactly the same thing — the concentration of glucose in your blood — just expressed on a different scale.

How to Convert Blood Sugar Units

To convert mg/dL to mmol/L, multiply your value by 0.0555. To convert mmol/L to mg/dL, multiply by 18.018. Our converter does this automatically as you type.

For example, a fasting blood sugar of 126 mg/dL equals 7.0 mmol/L — the threshold used by the American Diabetes Association to diagnose diabetes.

Medical disclaimer: This tool is for informational purposes only and does not constitute medical advice. Always discuss your blood sugar readings with a qualified healthcare professional.

Sources

  1. 1.American Diabetes Association. Standards of Medical Care in Diabetes. Diabetes Care. 2024;47(Suppl 1). diabetesjournals.org
  2. 2.World Health Organization. Definition and diagnosis of diabetes mellitus and intermediate hyperglycaemia. WHO Press, 2006.
  3. 3.American Diabetes Association. Blood Glucose and Insulin. diabetes.org
  4. 4.International Diabetes Federation. Guideline on Self-Monitoring of Blood Glucose in Non-Insulin Treated Type 2 Diabetes. IDF, 2009.