How do you convert hemoglobin from g/dL to mmol/L?

Divide by the molar mass. For hemoglobin (16114.5 g/mol), 1 g/dL = 0.620559 mmol/L.

Why isn't there one factor for g/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 › Hemoglobin

Hemoglobin: g/dL to mmol/L

1 g/dL = 0.620559 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

g/dL	mmol/L
8 g/dL	4.9645 mmol/L
10 g/dL	6.2056 mmol/L
12 g/dL	7.4467 mmol/L
13 g/dL	8.0673 mmol/L
14 g/dL	8.6878 mmol/L
15 g/dL	9.3084 mmol/L
16 g/dL	9.9289 mmol/L
18 g/dL	11.1701 mmol/L

Going the other way, 1 mmol/L = 1.6115 g/dL.

Why this conversion needs the substance

g/dL measures mass; mmol/L measures amount of substance. Converting between them needs the molar mass of the thing being measured — for hemoglobin that is 16114.5 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 hemoglobin 14 g/dL in mmol/L and it answers 8.6878 mmol/L. Leave the substance out and it deliberately returns nothing rather than guessing.

Other lab values

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