.iv-calculator-wrapper {
max-width: 800px;
margin: 0 auto;
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
color: #333;
line-height: 1.6;
}
.iv-calc-box {
background-color: #f8f9fa;
border: 1px solid #e9ecef;
border-radius: 8px;
padding: 25px;
margin-bottom: 30px;
box-shadow: 0 4px 6px rgba(0,0,0,0.05);
}
.iv-calc-title {
text-align: center;
color: #2c3e50;
margin-bottom: 20px;
font-size: 24px;
font-weight: 700;
}
.iv-form-group {
margin-bottom: 15px;
}
.iv-form-group label {
display: block;
margin-bottom: 5px;
font-weight: 600;
color: #495057;
}
.iv-input-field {
width: 100%;
padding: 10px;
border: 1px solid #ced4da;
border-radius: 4px;
font-size: 16px;
box-sizing: border-box;
}
.iv-input-field:focus {
border-color: #007bff;
outline: none;
box-shadow: 0 0 0 0.2rem rgba(0,123,255,0.25);
}
.iv-btn-container {
display: flex;
gap: 10px;
margin-top: 20px;
}
.iv-btn {
flex: 1;
padding: 12px;
border: none;
border-radius: 4px;
font-size: 16px;
font-weight: 600;
cursor: pointer;
transition: background-color 0.2s;
}
.iv-btn-calc {
background-color: #007bff;
color: white;
}
.iv-btn-calc:hover {
background-color: #0056b3;
}
.iv-btn-reset {
background-color: #6c757d;
color: white;
}
.iv-btn-reset:hover {
background-color: #545b62;
}
.iv-result-box {
margin-top: 25px;
background-color: #e8f4fd;
border: 1px solid #b8daff;
border-radius: 6px;
padding: 20px;
display: none;
}
.iv-result-item {
margin-bottom: 10px;
font-size: 18px;
border-bottom: 1px solid #b8daff;
padding-bottom: 10px;
}
.iv-result-item:last-child {
border-bottom: none;
margin-bottom: 0;
padding-bottom: 0;
}
.iv-result-value {
font-weight: 700;
color: #0056b3;
float: right;
}
.iv-article {
margin-top: 40px;
padding: 20px;
background: #fff;
border-top: 2px solid #eee;
}
.iv-article h2 {
color: #2c3e50;
font-size: 22px;
margin-top: 0;
}
.iv-article h3 {
color: #34495e;
font-size: 18px;
margin-top: 20px;
}
.iv-article ul {
padding-left: 20px;
}
.iv-article li {
margin-bottom: 8px;
}
.formula-box {
background: #f1f1f1;
padding: 15px;
border-left: 4px solid #007bff;
font-family: monospace;
margin: 15px 0;
}
.error-msg {
color: #dc3545;
font-size: 14px;
margin-top: 5px;
display: none;
}
function calculateIVFlowRate() {
// Get input values
var volumeStr = document.getElementById("totalVolume").value;
var hoursStr = document.getElementById("timeHours").value;
var dropFactorStr = document.getElementById("dropFactor").value;
var errorDiv = document.getElementById("ivError");
var resultDiv = document.getElementById("ivResults");
// Convert to numbers
var volume = parseFloat(volumeStr);
var hours = parseFloat(hoursStr);
var dropFactor = parseFloat(dropFactorStr);
// Validation logic
if (isNaN(volume) || isNaN(hours) || volume <= 0 || hours <= 0) {
errorDiv.style.display = "block";
resultDiv.style.display = "none";
return;
}
// Hide error if valid
errorDiv.style.display = "none";
// Calculation Logic
// 1. Calculate Total Minutes
var totalMinutes = hours * 60;
// 2. Calculate mL per Hour
var mlPerHour = volume / hours;
// 3. Calculate Drops per Minute (gtt/min)
// Formula: (Volume (mL) * Drop Factor (gtt/mL)) / Time (min)
var gttPerMin = (volume * dropFactor) / totalMinutes;
// Rounding rules:
// gtt/min is usually a whole number because you can't count partial drops easily manually.
// mL/hr is usually rounded to one decimal place for electronic pumps.
var gttPerMinRounded = Math.round(gttPerMin);
var mlPerHourRounded = mlPerHour.toFixed(1);
// Update Result Display
document.getElementById("resGttMin").innerHTML = gttPerMinRounded + " gtt/min";
document.getElementById("resMlHr").innerHTML = mlPerHourRounded + " mL/hr";
document.getElementById("resTotalMin").innerHTML = Math.round(totalMinutes) + " min";
// Show results
resultDiv.style.display = "block";
}
function resetIVCalculator() {
document.getElementById("totalVolume").value = "";
document.getElementById("timeHours").value = "";
document.getElementById("dropFactor").value = "15"; // Reset to default standard
document.getElementById("ivResults").style.display = "none";
document.getElementById("ivError").style.display = "none";
}
IV Flow Rate Calculator
10 gtt/mL (Macrodrip)
15 gtt/mL (Macrodrip)
20 gtt/mL (Macrodrip)
60 gtt/mL (Microdrip)
Please enter valid positive numbers for Volume and Time.
Drip Rate (gtt/min): –
Flow Rate (mL/hr): –
Total Minutes: –
About IV Flow Rate Calculation
In clinical settings, accurately calculating the intravenous (IV) flow rate is a critical skill for nurses and healthcare providers. Ensuring the correct volume of fluid or medication is delivered over a specific period helps prevent complications such as fluid overload or under-dosing. This calculator determines the drip rate in drops per minute (gtt/min) and the flow rate in milliliters per hour (mL/hr) based on standard infusion parameters.
How to Calculate IV Drip Rate
The IV flow rate calculation relies on three primary variables: the total volume of fluid to be infused, the duration of the infusion, and the drop factor of the tubing set being used. The drop factor represents the number of drops (gtt) required to equal 1 milliliter (mL) of fluid.
Formula: (Total Volume (mL) × Drop Factor (gtt/mL)) ÷ Time (minutes) = Flow Rate (gtt/min)
Understanding Drop Factors
IV tubing comes in different sizes, primarily categorized as macrodrip or microdrip sets:
- Macrodrip Sets: Usually deliver 10, 15, or 20 drops per mL. These are used for general IV fluids where large volumes are infused quickly.
- Microdrip Sets: Always deliver 60 drops per mL. These are used for pediatric patients or when precise, small volumes of medication are required.
Calculation Example
Suppose a doctor orders 1,000 mL of Normal Saline to be infused over 8 hours using a tubing set with a drop factor of 15 gtt/mL.
- Convert hours to minutes: 8 hours × 60 = 480 minutes.
- Apply the formula: (1000 mL × 15 gtt/mL) ÷ 480 min.
- Calculation: 15,000 ÷ 480 = 31.25.
- Result: The nurse should set the drip rate to approximately 31 gtt/min (drops per minute).
Note: This tool is for educational and verification purposes only. Always double-check calculations and follow your facility's specific protocols and guidelines regarding patient care.