Pediatric Ivf Rate Calculator

Pediatric IV Fluid Rate Calculator

Hourly Maintenance

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mL/hr

Daily Maintenance

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mL/day

Standard Bolus (20 mL/kg)

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mL (Isotonic Crystalloid)

*Calculated using the Holliday-Segar (4-2-1) Method.

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Understanding Pediatric IV Fluid Management

In pediatric medicine, fluid replacement is not "one size fits all." Unlike adults, children have different metabolic rates and body surface areas relative to their weight. The Holliday-Segar Method, often called the 4-2-1 Rule, is the clinical standard for calculating maintenance intravenous fluids (IVF) in infants and children.

The 4-2-1 Rule Breakdown

To calculate the hourly maintenance rate (mL/hr), follow these weight-based tiers:

• 0 – 10 kg: 4 mL/hr for every kg of body weight.
• 11 – 20 kg: 40 mL/hr + 2 mL/hr for every kg over 10 kg.
• Over 20 kg: 60 mL/hr + 1 mL/hr for every kg over 20 kg.

Calculation Examples

Example 1: A child weighing 8 kg
Using the 4 mL/kg/hr rule: 8 kg × 4 = 32 mL/hr.

Example 2: A child weighing 15 kg
First 10 kg = 40 mL/hr. Remaining 5 kg = 5 × 2 mL/hr (10 mL/hr). Total = 50 mL/hr.

Example 3: A child weighing 25 kg
First 10 kg = 40 mL/hr. Second 10 kg = 20 mL/hr. Remaining 5 kg = 5 × 1 mL/hr. Total = 65 mL/hr.

Fluid Bolus for Resuscitation

In cases of acute dehydration or shock, clinicians often administer a rapid "bolus." The standard pediatric bolus is 20 mL per kilogram of an isotonic crystalloid, such as Normal Saline (0.9% NaCl) or Lactated Ringer's.

Medical Disclaimer: This calculator is for educational purposes only. Clinical decisions should be made by qualified healthcare professionals based on the patient's specific clinical status, electrolyte levels, and renal function.

function calculatePediatricIVF() { var weight = parseFloat(document.getElementById('patientWeight').value); var hourlyRateBox = document.getElementById('hourlyRate'); var dailyRateBox = document.getElementById('dailyRate'); var bolusBox = document.getElementById('bolusVolume'); var resultsDiv = document.getElementById('ivfResults'); if (isNaN(weight) || weight <= 0) { alert("Please enter a valid weight greater than 0."); return; } var hourly = 0; var daily = 0; // Hourly Calculation (4-2-1 Rule) if (weight <= 10) { hourly = weight * 4; } else if (weight <= 20) { hourly = 40 + ((weight – 10) * 2); } else { hourly = 60 + ((weight – 20) * 1); } // Daily Calculation (100-50-20 Rule) if (weight <= 10) { daily = weight * 100; } else if (weight <= 20) { daily = 1000 + ((weight – 10) * 50); } else { daily = 1500 + ((weight – 20) * 20); } // Bolus Calculation (20 mL/kg) var bolus = weight * 20; // Display Results hourlyRateBox.innerText = hourly.toFixed(1); dailyRateBox.innerText = daily.toFixed(0); bolusBox.innerText = bolus.toFixed(0); resultsDiv.style.display = 'block'; }