body {
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
line-height: 1.6;
color: #333;
max-width: 800px;
margin: 0 auto;
padding: 20px;
background-color: #f9f9f9;
}
.calculator-container {
background: #ffffff;
padding: 30px;
border-radius: 12px;
box-shadow: 0 4px 15px rgba(0,0,0,0.1);
margin-bottom: 40px;
border-top: 5px solid #4285F4;
}
.calculator-title {
text-align: center;
margin-bottom: 25px;
color: #202124;
}
.input-group {
margin-bottom: 20px;
}
.input-group label {
display: block;
margin-bottom: 8px;
font-weight: 600;
color: #5f6368;
}
.input-group input {
width: 100%;
padding: 12px;
border: 1px solid #dadce0;
border-radius: 6px;
font-size: 16px;
box-sizing: border-box;
transition: border-color 0.2s;
}
.input-group input:focus {
border-color: #4285F4;
outline: none;
}
.btn-calculate {
display: block;
width: 100%;
padding: 15px;
background-color: #4285F4;
color: white;
border: none;
border-radius: 6px;
font-size: 18px;
font-weight: bold;
cursor: pointer;
transition: background-color 0.2s;
}
.btn-calculate:hover {
background-color: #3367d6;
}
.results-area {
margin-top: 30px;
background-color: #f8f9fa;
border-radius: 8px;
padding: 20px;
display: none;
}
.result-row {
display: flex;
justify-content: space-between;
align-items: center;
margin-bottom: 15px;
padding-bottom: 15px;
border-bottom: 1px solid #e0e0e0;
}
.result-row:last-child {
border-bottom: none;
margin-bottom: 0;
padding-bottom: 0;
}
.result-label {
font-weight: 600;
color: #5f6368;
}
.result-value {
font-size: 24px;
font-weight: bold;
color: #4285F4;
}
.result-secondary {
color: #EA4335;
}
.bar-container {
height: 20px;
background-color: #eee;
border-radius: 10px;
margin-top: 10px;
overflow: hidden;
display: flex;
}
.bar-engaged {
height: 100%;
background-color: #4285F4;
width: 0%;
transition: width 0.5s ease-in-out;
}
.bar-bounce {
height: 100%;
background-color: #EA4335;
width: 0%;
transition: width 0.5s ease-in-out;
}
.error-msg {
color: #d93025;
font-size: 14px;
margin-top: 5px;
display: none;
}
.article-content {
background: #fff;
padding: 30px;
border-radius: 12px;
box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}
h2 {
color: #202124;
margin-top: 0;
}
h3 {
color: #5f6368;
}
.formula-box {
background-color: #e8f0fe;
padding: 15px;
border-left: 4px solid #4285F4;
font-family: monospace;
margin: 20px 0;
font-size: 1.1em;
}
How is Engagement Rate Calculated in GA4?
Understanding user behavior in Google Analytics 4 (GA4) requires a shift in mindset from Universal Analytics (UA). One of the most significant changes is the replacement of the traditional "Bounce Rate" with Engagement Rate as a primary metric for assessing content quality and user interest.
The GA4 Engagement Rate Formula
The calculation for Engagement Rate in GA4 is straightforward, provided you understand the underlying metrics. It represents the percentage of sessions that interacted meaningfully with your website or app.
Engagement Rate = (Engaged Sessions / Total Sessions) × 100
For example, if your website received 1,000 total sessions and 650 of them were classified as "engaged," your Engagement Rate would be 65%.
What Qualifies as an "Engaged Session"?
To calculate this metric accurately, GA4 relies on the specific definition of an Engaged Session. A session is considered engaged if it meets at least one of the following criteria:
- Duration: The session lasts longer than 10 seconds.
- Conversion: The session results in a conversion event (e.g., a purchase or signup).
- Pageviews: The session involves 2 or more pageviews (or screenviews).
If a user visits your site and leaves within 5 seconds without triggering a conversion or visiting a second page, that session is not engaged. In UA, this was a "Bounce." In GA4, this simply contributes to a lower Engagement Rate.
Engagement Rate vs. Bounce Rate
In GA4, Bounce Rate is essentially the inverse of Engagement Rate. While UA defined bounce rate as single-page sessions with no interaction, GA4 defines it as the percentage of sessions that were not engaged.
GA4 Bounce Rate = 100% – Engagement Rate
Why is Engagement Rate Important?
This metric provides a more nuanced view of user activity than the old bounce rate. Because "Engaged Sessions" include users who stay for more than 10 seconds (even on a single page), it better accommodates blogs, news sites, and single-page applications where a user might read content successfully without clicking further.
function calculateEngagementRate() {
// Get input values using var
var totalSessionsInput = document.getElementById('ga4TotalSessions');
var engagedSessionsInput = document.getElementById('ga4EngagedSessions');
var errorMsg = document.getElementById('inputError');
var resultsArea = document.getElementById('ga4Results');
var totalSessions = parseFloat(totalSessionsInput.value);
var engagedSessions = parseFloat(engagedSessionsInput.value);
// Reset error state
errorMsg.style.display = 'none';
resultsArea.style.display = 'none';
// Validation Logic
if (isNaN(totalSessions) || totalSessions <= 0) {
alert("Please enter a valid number for Total Sessions greater than 0.");
return;
}
if (isNaN(engagedSessions) || engagedSessions totalSessions) {
errorMsg.style.display = 'block';
return;
}
// Calculation Logic
var engagementRate = (engagedSessions / totalSessions) * 100;
var bounceRate = 100 – engagementRate;
// Formatting results to 2 decimal places
var formattedEngagement = engagementRate.toFixed(2);
var formattedBounce = bounceRate.toFixed(2);
// Update DOM elements
document.getElementById('displayEngagementRate').innerText = formattedEngagement + "%";
document.getElementById('displayBounceRate').innerText = formattedBounce + "%";
// Update Visual Bars
document.getElementById('barEngaged').style.width = formattedEngagement + "%";
document.getElementById('barBounce').style.width = formattedBounce + "%";
// Show Results
resultsArea.style.display = 'block';
}