Blood Sugar Converter

Convert blood glucose between mg/dL and mmol/L with reference ranges.

mg/dL:

mmol/L:

–Category (fasting)

–Est. HbA1c*

Fasting ranges: normal <100 mg/dL · prediabetes 100–125 · diabetes ≥126. *HbA1c estimated from a single reading — not diagnostic.

How to use

Enter a value in either unit — the other appears with its reference range; everything runs in your browser.

What is normal fasting glucose?

70–100 mg/dL (3.9–5.6 mmol/L) for adults without diabetes.

Is this medical advice?

No — this is a unit converter only. Talk to your doctor about your readings.

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