Magnesium Unit Converter

In short Magnesium is reported in mg/dL in some countries and mmol/L in others, and the two are related by a fixed factor: 1 mg/dL = 0.411438 mmol/L, so to go the other way you divide by 2.4305. 1.8 mg/dL is 0.74 mmol/L; 2.0 mg/dL is 0.82 mmol/L; 2.4 mg/dL is 0.99 mmol/L. The factor is not arbitrary — it comes from the molar mass, because magnesium has an atomic mass of 24.305 g/mol, and that is why every analyte has its own factor rather than one shared conversion. Magnesium is reported in three units in common use — mg/dL, mmol/L and mEq/L — which is more than any other routine electrolyte, and the three differ by factors that are easy to mix up. Magnesium is divalent like calcium, so mEq/L is twice mmol/L. This converts units. It does not interpret results, does not compare your value against a reference interval, and is not a substitute for the clinician who ordered the test — reference intervals differ between laboratories, methods and populations.