Infusion Rate Calculator Mcg Kg Min – Cost Calculator

Infusion Rate Calculator (mcg/kg/min)

Patient Weight (kg)

Desired Dose (mcg/kg/min)

Total Drug Amount (mg)

Diluent Volume (mL)

Calculation Result

Infusion Pump Rate:

0 mL/hr

Understanding the mcg/kg/min Infusion Rate Calculation

In critical care settings, medications such as vasopressors, inotropes, and sedatives are often dosed based on the patient's weight in micrograms per kilogram per minute (mcg/kg/min). This ensures that the physiological effect of the drug is proportional to the patient's size, which is especially critical in neonatal, pediatric, and intensive care medicine.

The Infusion Formula

To convert a weight-based dose (mcg/kg/min) into a pump rate (mL/hr), the following mathematical steps are required:

Calculate Concentration: Total Drug (mg) / Bag Volume (mL) = mg/mL.
Convert to Micrograms: (mg/mL) × 1000 = mcg/mL.
Calculate mcg/hr: Desired Dose (mcg/kg/min) × Weight (kg) × 60 minutes = mcg/hr.
Final Pump Rate: (mcg/hr) / (mcg/mL) = mL/hr.

Example Calculation

Suppose you have a patient weighing 80 kg. You need to start a Dopamine drip at 5 mcg/kg/min. The pharmacy provides a bag containing 400 mg of Dopamine in 250 mL of D5W.

Concentration: 400 mg / 250 mL = 1.6 mg/mL (or 1600 mcg/mL).
Patient Dose: 5 mcg × 80 kg × 60 min = 24,000 mcg/hr.
Pump Rate: 24,000 mcg/hr ÷ 1600 mcg/mL = 15 mL/hr.

Clinical Importance

Accurate infusion calculations are vital for patient safety. High-alert medications like Norepinephrine, Dobutamine, or Propofol have narrow therapeutic windows. Using a calculator helps mitigate the risk of "math errors" during high-stress situations, although manual double-checking remains the gold standard in nursing and medical practice.

function calculateInfusionRate() { var weight = parseFloat(document.getElementById('patientWeight').value); var dose = parseFloat(document.getElementById('desiredDose').value); var drugMg = parseFloat(document.getElementById('drugMg').value); var volume = parseFloat(document.getElementById('bagVolume').value); var resultsArea = document.getElementById('resultsArea'); var finalRateDisplay = document.getElementById('finalRate'); var concentrationSummary = document.getElementById('concentrationSummary'); // Validation if (isNaN(weight) || weight <= 0 || isNaN(dose) || dose <= 0 || isNaN(drugMg) || drugMg <= 0 || isNaN(volume) || volume <= 0) { alert("Please enter valid positive numbers for all fields."); resultsArea.style.display = "none"; return; } // Calculation Logic // 1. Get concentration in mcg/mL var concentrationMgMl = drugMg / volume; var concentrationMcgMl = concentrationMgMl * 1000; // 2. Calculate required mcg per hour var totalMcgPerMin = dose * weight; var totalMcgPerHour = totalMcgPerMin * 60; // 3. Calculate mL per hour var mlPerHour = totalMcgPerHour / concentrationMcgMl; // Display Results finalRateDisplay.innerHTML = mlPerHour.toFixed(2) + " mL/hr"; concentrationSummary.innerHTML = "Drug Concentration: " + concentrationMgMl.toFixed(2) + " mg/mL (" + concentrationMcgMl.toFixed(0) + " mcg/mL)"; resultsArea.style.display = "block"; }