Units & Conversions
Blood Glucose Converter - Convert blood sugar between mg/dL and mmol/L
Convert blood sugar between mg/dL and mmol/L
Formulas and edge cases are reviewed against authoritative references before publication. For methodology, editorial standards, or corrections, use the links below.
Frequently asked questions
Which unit is more common?
US uses mg/dL; most other countries use mmol/L. Know your meter's units.
What is normal fasting glucose?
Normal: 70-100 mg/dL (3.9-5.6 mmol/L). Pre-diabetic: 100-125 mg/dL (5.6-6.9 mmol/L).
Why different units?
Historical preference. Both measure the same thing - concentration of glucose in blood.
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About this tool
Use this Blood Glucose Converter to convert a value quickly and consistently. Provide Blood Glucose Value, Unit, and Low and it returns mg/dL and mmol/L.
If you are comparing results across tools, keep the same units and the same level of precision. The displayed value may be rounded, so copy more decimal places when you need a tighter match.