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

Divide by the molar mass. For lactate (90.08 g/mol), 1 mg/dL = 0.111012 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 › Lactate

Lactate: mg/dL to mmol/L

1 mg/dL = 0.111012 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.

Try it — edit the line, the answer updates as you type Open in Jotal

Conversion table

mg/dL	mmol/L
5 mg/dL	0.555062 mmol/L
9 mg/dL	0.999112 mmol/L
18 mg/dL	1.9982 mmol/L
27 mg/dL	2.9973 mmol/L
36 mg/dL	3.9964 mmol/L
45 mg/dL	4.9956 mmol/L

Going the other way, 1 mmol/L = 9.008 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 lactate that is 90.08 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 lactate 27 mg/dL in mmol/L and it answers 2.9973 mmol/L. Leave the substance out and it deliberately returns nothing rather than guessing.

Other lab values

Jotal is a notepad that does maths

Free, works offline, no account. Lab units, ordinary units, currencies, percentages, dates and running totals — written in plain language, answers down the right-hand side.

Open Jotal