How do you convert glucose from mg/dL to mmol/L?

Divide by the molar mass. For glucose (180.156 g/mol), 1 mg/dL = 0.055507 mmol/L.

Why isn't there one factor for mg/dL to mmol/L?

Because mg measures mass and mmol measures amount of substance, the factor depends on the molar mass of what is being measured. Every analyte has its own.

Calculators › Glucose

Glucose: mg/dL to mmol/L

1 mg/dL = 0.055507 mmol/L

Reference only. These conversions are arithmetic, not medical advice. Reference ranges differ between laboratories, and results should be interpreted by a clinician alongside the lab's own reported units and ranges.

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Conversion table

mg/dL	mmol/L
70 mg/dL	3.8855 mmol/L
90 mg/dL	4.9957 mmol/L
100 mg/dL	5.5507 mmol/L
110 mg/dL	6.1058 mmol/L
126 mg/dL	6.9939 mmol/L
140 mg/dL	7.771 mmol/L
180 mg/dL	9.9913 mmol/L
200 mg/dL	11.1015 mmol/L
250 mg/dL	13.8769 mmol/L
300 mg/dL	16.6522 mmol/L

Going the other way, 1 mmol/L = 18.0156 mg/dL.

Why this conversion needs the substance

mg/dL measures mass; mmol/L measures amount of substance. Converting between them needs the molar mass of the thing being measured — for glucose that is 180.156 g/mol. That is why a generic converter can't do it, and why every analyte has a different factor.

Jotal works this out from molar mass rather than a stored factor, so write glucose 140 mg/dL in mmol/L and it answers 7.771 mmol/L. Leave the substance out and it deliberately returns nothing rather than guessing.

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