Magnesium mmol/L to mg/dL Converter
Instantly convert serum magnesium results between mmol/L and mg/dL. Accurate, free lab unit converter with clinical reference ranges included.
Convert Magnesium Units
Enter a magnesium lab value below to get an instant, precise conversion between mmol/L (SI unit) and mg/dL (conventional US unit).
Magnesium Unit Converter
Enter the value to see the converted result
Converted Value
Based on the standard molar mass of magnesium
Common Magnesium Conversions
Standard conversions for quick lookup when comparing lab reports that use different measurement systems.
| mmol/L | mg/dL | Typical Interpretation* |
|---|---|---|
| 0.40 | 0.97 | Markedly low |
| 0.50 | 1.22 | Low |
| 0.60 | 1.46 | Low |
| 0.70 | 1.70 | Low-normal |
| 0.85 | 2.07 | Normal |
| 1.00 | 2.43 | Normal |
| 1.10 | 2.67 | High-normal |
| 1.20 | 2.92 | Elevated |
| 1.50 | 3.65 | High |
| 2.00 | 4.86 | Markedly high |
Magnesium Conversion FAQ
Everything you need to know about converting and reading serum magnesium lab values.
Multiply the mmol/L value by 2.4305, which comes from the atomic weight of magnesium (24.305 g/mol) divided by 10. For example, 0.85 mmol/L × 2.4305 = 2.07 mg/dL. To go the other way, multiply mg/dL by 0.4114.
A commonly cited normal serum magnesium reference range is roughly 0.70 to 1.00 mmol/L, equivalent to about 1.70 to 2.40 mg/dL. Ranges vary slightly by laboratory and assay method, so the range printed on your own lab report is the one that applies to your result.
Countries using the International System of Units, including the UK, most of Europe, Canada, and Australia, report magnesium in mmol/L. The United States conventionally reports it in mg/dL. Both describe the same blood concentration, just on different numerical scales.
A result below the reference range is called hypomagnesemia and a result above it is called hypermagnesemia. Both can influence nerve, muscle, and cardiac function. This calculator only converts units; interpreting what a result means for your health should come from a doctor or other qualified clinician.