Nov 20, 2025
v.0
Versions
Bugs
None!
Get This App On Your Website
1. Copy the code above with the iframe and link.
2. Paste the code into your website.
3. Resize the iframe to fit your website.
2. Paste the code into your website.
3. Resize the iframe to fit your website.
Javascript, HTML, CSS Code
<html>
<head>
<script type="text/javascript"> window.addEventListener('error', function(event) { var message = JSON.parse(JSON.stringify(event.message)); var source = event.filename; var lineno = event.lineno; var colno = event.colno; var error = event.error; window.parent.postMessage({ type: 'iframeError', details: { message: message, source: source, lineno: lineno, colno: colno, error: error ? error.stack : '' } }, '*'); }); window.addEventListener('unhandledrejection', function(event) { window.parent.postMessage({ type: 'iframePromiseRejection', details: { reason: event.reason } }, '*'); }); </script>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width,initial-scale=1">
<title>Airflow Calculator</title>
<meta name="description" content="Calculate airflow based on duct diameter and air velocity easily.">
<meta name="keywords" content="airflow, calculator, duct diameter, air velocity, HVAC">
<!-- Libraries -->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.6.0/jquery.min.js" crossorigin="anonymous"></script>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/css/bootstrap.min.css" crossorigin="anonymous">
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/js/bootstrap.min.js" crossorigin="anonymous"></script>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/@fortawesome/fontawesome-free@6.6.0/css/fontawesome.min.css" crossorigin="anonymous">
<script type="text/javascript">
try {
// This will run when the DOM is ready.
document.addEventListener("DOMContentLoaded", function() {
$('#calculate-button').on('click', function() {
const velocity = parseFloat($('#velocity').val());
const diameter = parseFloat($('#diameter').val());
if (isNaN(velocity) || isNaN(diameter) || velocity <= 0 || diameter <= 0) {
alert('Please enter valid positive numbers for velocity and diameter.');
return;
}
const area = Math.PI * Math.pow((diameter / 2), 2);
const airflow = area * velocity; // Cubic meters per second
$('#result').html(`Airflow: ${airflow.toFixed(2)} m³/s`);
});
});
} catch (error) {
throw error;
}
</script>
<style>
body {
background: linear-gradient(to right, #4facfe, #00f2fe);
color: #ffffff;
}
#main-container {
margin-top: 50px;
background-color: rgba(0, 0, 0, 0.7);
border-radius: 10px;
padding: 25px;
}
.input-field {
margin-bottom: 15px;
}
#calculate-button {
background-color: #f39c12;
color: #fff;
}
#calculate-button:hover {
background-color: #e67e22;
}
h1 {
text-align: center;
margin-bottom: 20px;
font-size: 2.5rem;
}
#result {
font-size: 1.5rem;
text-align: center;
color: #2ecc71;
}
</style>
<link rel="canonical" href="https://calculator.tools/app/airflow-calculator-1694/">
<meta charset="utf-8">
</head>
<body>
<div id="main-container" class="container">
<h1>Airflow Calculator</h1>
<div class="input-field">
<label for="velocity">Air Velocity (m/s):</label>
<input type="number" id="velocity" class="form-control" placeholder="Enter air velocity" />
</div>
<div class="input-field">
<label for="diameter">Duct Diameter (m):</label>
<input type="number" id="diameter" class="form-control" placeholder="Enter duct diameter" />
</div>
<button id="calculate-button" class="btn btn-primary btn-block">Calculate Airflow</button>
<div id="result" class="mt-3"></div>
</div>
<script type="text/javascript"> var localStoragePrefix = "ct-1694"; var lastSave = 0; function saveLocal(data) { if (Date.now() - lastSave < 1000) { return; } let cookie = localStoragePrefix + "=" + JSON.stringify(data) + "; path=" + window.location.pathname + "'; SameSite=Strict"; cookie += "; expires=" + new Date(Date.now() + 1000 * 60 * 60 * 24 * 365 * 1000).toUTCString(); document.cookie = cookie; lastSave = Date.now(); } function loadLocal() { var cookiePrefix = localStoragePrefix + "="; var cookieStart = document.cookie.indexOf(cookiePrefix); if (cookieStart > -1) { let cookieEnd = document.cookie.indexOf(";", cookieStart); if (cookieEnd == -1) { cookieEnd = document.cookie.length; } var cookieData = document.cookie.substring(cookieStart + cookiePrefix.length, cookieEnd); return JSON.parse(cookieData); } } </script>
<script type="text/javascript"> window.addEventListener('load', function() { var observer = new MutationObserver(function() { window.parent.postMessage({height: document.documentElement.scrollHeight || document.body.scrollHeight},"*"); }); observer.observe(document.body, {attributes: true, childList: true, subtree: true}); window.parent.postMessage({height: document.documentElement.scrollHeight || document.body.scrollHeight},"*"); }); </script>
</body>
</html>
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