Magnesium Deficit Calculator

Estimate magnesium deficiency and replacement needs for patients with hypomagnesemia.

Enter Values

Weight (kg)

Current Magnesium (mg/dL)

Target Magnesium (mg/dL)

Enter values above and click Calculate to see your result.

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(Target Mg - Current Mg) * 0.2 * Weight

Helps estimate total body stores deficiency, although magnesium is primarily intracellular and skeletal.

70kg Patient, 1.2 Mg, Target 2.0 -> Deficit estimation guide.

Typically 1.7 to 2.2 mg/dL.

Commonly with Magnesium Sulfate (IV) or Magnesium Oxide (Oral), depending on severity and symptoms.

Magnesium stabilizes the electrical activity of cardiac cells and is essential for preventing arrhythmias like Torsades de Pointes.

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Corrected calcium for hypoalbuminemia.

Serum anion gap for metabolic acidosis.

CrCl for kidney function and drug dosing.

IV flow rate in gtt/min.

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