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Electrolytes & minerals

Magnesium: convert mg/dL to mmol/L

mmol/L = mg/dL × 0.4114

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Enter a value in any unit and all other units fill in.

Conversion formulas

mg/dL → mmol/Lmmol/L = mg/dL × 0.4114
mmol/L → mg/dLmg/dL = mmol/L × 2.431

Conversion table

Highlighted: values inside the adult reference range.

mg/dLmmol/L
0.50.2057
10.4114
1.50.6171
20.8228
2.51.028
31.234
3.51.44
41.646
4.51.851
52.057
5.52.263
62.468

Reference range

1.702 – 2.431 mg/dL = 0.7 – 1 mmol/L

Source: Pathology Harmony Group (ACB, IBMS, RCPath): Agreed Adult Clinical Biochemistry Reference Intervals, January 2011 · Last reviewed: 2026-10-14

Frequently asked questions

How do I convert Magnesium from mg/dL to mmol/L?

mmol/L = mg/dL × 0.4114. For example, 2 mg/dL equals 0.823 mmol/L.

How many mmol/L are 2 mg/dL?

2 mg/dL equal 0.823 mmol/L (Magnesium).

How do I convert Magnesium from mmol/L back to mg/dL?

mg/dL = mmol/L × 2.431.

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