Magnesium mmol/L → mg/dL
Convert magnesium from mmol/L to mg/dL
Sources last checked: 2026-11-03
Magnesium mmol/L → mg/dL
Convert magnesium from mmol/L to mg/dL
Converts units only; reference ranges depend on the laboratory, the assay and the patient.
What is the Magnesium mmol/L → mg/dL?
This converter turns total serum magnesium from mmol/L, common in German, Austrian, UK and Scandinavian labs, into mg/dL, the unit of most Turkish and US reports and of many US references. It divides by 0.4114 (equivalent to multiplying by 2.4305), which reflects the atomic mass of magnesium, 24.305 g/mol.
When to use it
- Reading US or Turkish literature on electrolyte disorders with a European result in hand
- Entering magnesium into a form or protocol that expects mg/dL
- Comparing results from labs using different units
When not to use it
- Values given in mEq/L — halve them to get mmol/L first
- Converting magnesium doses (e.g. mmol of magnesium sulfate) — dose units are a separate question from serum concentration
How it is calculated
Magnesium (mg/dL) = magnesium (mmol/L) ÷ 0.4114
Clinical pearls and limitations
- Converts units only; reference ranges depend on the laboratory, the assay and the patient.
- Multiplying by 2.4305 gives the same result as dividing by 0.4114; both come from the atomic mass 24.305 g/mol.
- mEq/L is twice the mmol/L value for magnesium; some older references use mEq/L, so check which unit a threshold refers to.
- Delayed separation or haemolysis of the sample can raise magnesium falsely.
- Reference ranges are laboratory-specific; compare with the range printed on the report.
Frequently asked questions
How do I convert magnesium from mmol/L to mg/dL?
Divide by 0.4114 (or multiply by 2.4305). For example, 0.82 mmol/L ÷ 0.4114 = 1.99 mg/dL.
What is 1 mmol/L magnesium in mg/dL?
1 ÷ 0.4114 = 2.43 mg/dL.
Is mmol/L the same as mEq/L for magnesium?
No. Magnesium carries two charges, so 1 mmol/L = 2 mEq/L.
Evidence and guidelines
Have a follow-up question?
Medelix answers clinical questions from current guidelines and studies — every statement with its source.
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<p><a href="https://medelix.ai/en/calculators/magnesium-mmol-l-to-mg-dl">Magnesium 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.