Infusion Flow Rate Calculation

Infusion Flow Rate Calculator

10 gtt/mL (Macro) 15 gtt/mL (Macro) 20 gtt/mL (Macro) 60 gtt/mL (Micro)

Calculation Results:

Electronic Pump Rate: 0 mL/hr

Manual Drip Rate: 0 gtt/min

Understanding Infusion Flow Rate Calculations

In clinical settings, accurately calculating the infusion flow rate is critical for patient safety and effective medication delivery. Whether you are using an electronic infusion pump or a manual gravity drip, knowing how to determine the rate ensures the prescribed volume is delivered over the correct duration.

How to Use This Calculator

1. Total Volume: Enter the total amount of fluid to be infused in milliliters (mL).
2. Time: Enter the duration prescribed for the infusion. You can enter hours, minutes, or both (e.g., 1 hour and 30 minutes).
3. Drop Factor: Select the drop factor of your administration set. This is the number of drops (gtt) that equal 1 mL. Standard macro-drip sets are usually 10, 15, or 20 gtt/mL, while micro-drip sets are 60 gtt/mL.

The Formulas

1. To find mL/hr (Pump Rate):

Flow Rate (mL/hr) = Total Volume (mL) / Total Time (hr)

2. To find gtt/min (Manual Drip Rate):

Drip Rate (gtt/min) = [Total Volume (mL) × Drop Factor (gtt/mL)] / Time in Minutes

Realistic Example

Scenario: A physician orders 500 mL of Normal Saline to be infused over 4 hours using a 15 gtt/mL administration set.

• Step 1 (mL/hr): 500 mL / 4 hours = 125 mL/hr.
• Step 2 (gtt/min): (500 mL × 15 gtt/mL) / 240 minutes = 31.25 gtt/min (Round to 31 gtt/min).

Disclaimer: This tool is for educational purposes only. Always verify medical calculations with a secondary source and follow institutional protocols.

function calculateInfusion() { var volume = parseFloat(document.getElementById('totalVolume').value); var hours = parseFloat(document.getElementById('timeHours').value) || 0; var minutes = parseFloat(document.getElementById('timeMinutes').value) || 0; var dropFactor = parseFloat(document.getElementById('dropFactor').value); if (isNaN(volume) || volume <= 0) { alert("Please enter a valid Total Volume."); return; } var totalMinutes = (hours * 60) + minutes; if (totalMinutes <= 0) { alert("Please enter a valid Time duration."); return; } // Calculation for mL/hr var totalHours = totalMinutes / 60; var mlPerHr = volume / totalHours; // Calculation for gtt/min var gttPerMin = (volume * dropFactor) / totalMinutes; // Display results document.getElementById('mlPerHrResult').innerHTML = mlPerHr.toFixed(1); document.getElementById('gttPerMinResult').innerHTML = Math.round(gttPerMin); document.getElementById('infusionResult').style.display = 'block'; // Scroll to results document.getElementById('infusionResult').scrollIntoView({ behavior: 'smooth', block: 'nearest' }); }