How to Calculate Tidal Volume from Respiratory Rate
by
Tidal Volume Calculator
Tidal Volume (TV) is the amount of air that moves in and out of the lungs with each normal breath. It's a crucial parameter in respiratory care, especially for patients on mechanical ventilation. This calculator helps estimate Tidal Volume based on respiratory rate and minute ventilation, or helps calculate minute ventilation if tidal volume and respiratory rate are known. Typically, for adults, a resting tidal volume is around 500 mL (or 5-8 mL/kg of ideal body weight).
function calculateTidalVolume() {
var minuteVentilationInput = document.getElementById("minuteVentilation");
var respiratoryRateInput = document.getElementById("respiratoryRate");
var resultDiv = document.getElementById("result");
var minuteVentilation = parseFloat(minuteVentilationInput.value);
var respiratoryRate = parseFloat(respiratoryRateInput.value);
resultDiv.innerHTML = ""; // Clear previous results
if (isNaN(minuteVentilation) || isNaN(respiratoryRate)) {
resultDiv.innerHTML = "Please enter valid numbers for both Minute Ventilation and Respiratory Rate.";
return;
}
if (respiratoryRate <= 0) {
resultDiv.innerHTML = "Respiratory Rate must be a positive number.";
return;
}
if (minuteVentilation < 0) {
resultDiv.innerHTML = "Minute Ventilation cannot be negative.";
return;
}
var tidalVolume = minuteVentilation / respiratoryRate;
resultDiv.innerHTML = "Calculated Tidal Volume: " + tidalVolume.toFixed(2) + " L";
resultDiv.innerHTML += "Note: This is an estimation. Actual tidal volume can vary based on individual physiology and clinical context.";
}
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font-family: sans-serif;
max-width: 500px;
margin: 20px auto;
padding: 20px;
border: 1px solid #ccc;
border-radius: 8px;
box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}
.calculator-container h2 {
text-align: center;
margin-bottom: 20px;
color: #333;
}
.input-section {
margin-bottom: 15px;
}
.input-section label {
display: block;
margin-bottom: 5px;
font-weight: bold;
color: #555;
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.input-section input[type="number"] {
width: calc(100% – 20px);
padding: 10px;
border: 1px solid #ccc;
border-radius: 4px;
font-size: 1rem;
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button {
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width: 100%;
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border-radius: 4px;
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cursor: pointer;
transition: background-color 0.3s ease;
}
button:hover {
background-color: #0056b3;
}
.result-section {
margin-top: 25px;
padding: 15px;
background-color: #e9ecef;
border: 1px solid #dee2e6;
border-radius: 4px;
text-align: center;
}
.result-section p {
margin: 0;
font-size: 1.1rem;
color: #333;
}
.result-section strong {
color: #28a745;
}
.error {
color: #dc3545;
font-weight: bold;
}