Magnesium Per Hour Calculator

Calculate the hourly magnesium infusion rate based on total dose, patient weight, and administration time for safe medication administration

Input Parameters

Calculation Results

Calculation Formula

Mg Hr = Total Dose (mg) / Administration Time (hours)

Where:
Mg Hr = Magnesium infusion rate in mg per hour
Total Dose = Total magnesium dose to be administered
Administration Time = Time period over which to administer the dose

Safety Note

Magnesium sulfate should be infused at a maximum rate of 1-2 g (1000-2000 mg) per hour. Ensure the calculated rate falls within safe limits. Consult hospital protocols.

Magnesium Per Hour Calculator Calculator Usage Guide

Learn how to use the Magnesium Per Hour Calculator and its working principles for safe medication administration

How to Use This Calculator

  1. Enter the patient's weight in kilograms (kg)
  2. Enter the total magnesium dose to be administered in milligrams (mg)
  3. Enter the planned administration time in hours (hours)
  4. Click the "Calculate" button to determine the infusion rate

Understanding the Results

The calculator provides two key results:

  • Infusion Rate (mg/hour): The amount of magnesium being administered per hour
  • Fluid Rate (mL/hour): The rate at which the magnesium solution should be infused (assuming 5% dextrose in water as the diluent)

Principle of Calculation

Magnesium sulfate is commonly administered as an intravenous infusion for conditions such as hypomagnesemia, myocardial infarction, and magnesium deficiency. The infusion rate is calculated by dividing the total dose by the administration time.

Important Considerations

  • Magnesium sulfate should be infused at a maximum rate of 1-2 g (1000-2000 mg) per hour to avoid toxicity.
  • The fluid rate assumes a 5% dextrose in water (D5W) dilution. If a different diluent is used, the fluid rate will change.
  • Always verify the calculated rate with hospital protocols and consult with a healthcare provider before administration.

Example Calculation

For a patient weighing 70 kg who requires a 4 gram (4000 mg) magnesium sulfate infusion over 4 hours:

Infusion Rate = 4000 mg / 4 hours = 1000 mg/hour

Fluid Rate (assuming D5W) = (4000 mg / 1000) × 10 mL = 40 mL/hour