diff --git a/index.html b/index.html
index d1ab621..733a6bc 100644
--- a/index.html
+++ b/index.html
@@ -1,6 +1,15 @@
 <!DOCTYPE html>
 <html lang="en">
 <head>
+<!-- Google Tag Manager -->
+<script>
+    (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':
+    new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],
+    j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src=
+    'https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);
+    })(window,document,'script','dataLayer','GTM-WZBBV8PX');
+</script>
+<!-- End Google Tag Manager -->
 <meta charset="UTF-8">
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
 <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.5.1/css/all.min.css" />
@@ -254,6 +263,12 @@
 </style>
 </head>
 <body>
+<!-- Google Tag Manager (noscript) -->
+<noscript>
+    <iframe src="https://www.googletagmanager.com/ns.html?id=GTM-WZBBV8PX"
+    height="0" width="0" style="display:none;visibility:hidden"></iframe>
+</noscript>
+<!-- End Google Tag Manager (noscript) -->
 <div class="container">
     <h1>Performance Index Calculator</h1>
     <div class="radio-buttons">
