Ethanol mmol/L → mg/dL
Convert ethanol from mmol/L to mg/dL
Sources last checked: 2026-11-03
Ethanol mmol/L → mg/dL
Convert ethanol from mmol/L to mg/dL
Converts units only; reference ranges depend on the laboratory, the assay and the patient.
What is the Ethanol mmol/L → mg/dL?
In the UK and in SI-based toxicology literature blood ethanol is given in mmol/L, while laboratories in the USA, Turkey and parts of Europe use mg/dL. This converter divides by 0.2171 (equivalent to multiplying by about 4.61), the factor derived from the molar mass of ethanol (46.07 g/mol). It applies to serum or plasma concentrations and does not produce per-mille (‰) values.
When to use it
- Bringing a mmol/L result from a UK report or SI-based paper into mg/dL
- Using mg/dL-based osmolality or toxicology references with a result reported in mmol/L
- Comparing serial values after a change of laboratory
When not to use it
- Producing a per-mille (‰) or legal blood-alcohol figure — that requires a whole-blood mass fraction, not a unit swap
- Other alcohols such as methanol or ethylene glycol, which have different molar masses
- Breath-alcohol readings
How it is calculated
Ethanol (mg/dL) = ethanol (mmol/L) ÷ 0.2171
Clinical pearls and limitations
- Converts units only; reference ranges depend on the laboratory, the assay and the patient.
- 1 mmol/L ≈ 4.61 mg/dL; 20 mmol/L ≈ 92 mg/dL.
- Rounding to whole mg/dL is sufficient.
- In mg/dL-based osmolality formulas ethanol is entered divided by roughly 4.6 to turn it into mmol/L — the same molar-mass relationship as this converter; some references use an empirically adjusted divisor instead.
- Serum and whole-blood ethanol differ for the same sample, so state the matrix whenever a value is passed on.
Frequently asked questions
How do I convert ethanol from mmol/L to mg/dL?
Divide by 0.2171. For example, 30 mmol/L ÷ 0.2171 = 138 mg/dL and 12 mmol/L ÷ 0.2171 = 55 mg/dL.
What is 1 mmol/L of ethanol in mg/dL?
About 4.61 mg/dL: one millimole of ethanol weighs 46.07 mg, and a litre contains 10 dL.
Why does ethanol matter for the osmolal gap?
Ethanol is a small, osmotically active molecule that raises measured osmolality but is not part of the usual calculated-osmolality formula. Expressing it in mmol/L shows how much of a gap it can account for; a gap that remains after allowing for ethanol raises the question of another osmotically active substance.
Evidence and guidelines
Have a follow-up question?
Medelix answers clinical questions from current guidelines and studies — every statement with its source.
Related calculators
Embed this calculatorFree to use on your website, intranet or teaching page. Copy the code below.
<iframe src="https://medelix.ai/en/embed/ethanol-mmol-to-mgdl" title="Ethanol mmol/L → mg/dL – Medelix" width="100%" height="620" style="border:0;max-width:720px" loading="lazy"></iframe>
<p><a href="https://medelix.ai/en/calculators/ethanol-mmol-l-to-mg-dl">Ethanol mmol/L → mg/dL calculator by Medelix</a></p>For healthcare professionals and medical students. These tools support, and do not replace, clinical judgement. Always check results against the original source and your local protocols.