HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>jQuery checked selector demo</title>
  <style>
    #count { color: #dc2626; margin-top: 12px; font-weight: bold; }
    label { display: inline-block; margin-right: 12px; }
  </style>
</head>
<body>
  <form>
    <label><input type="checkbox" name="newsletter" value="Hourly" checked> Hourly</label>
    <label><input type="checkbox" name="newsletter" value="Daily"> Daily</label>
    <label><input type="checkbox" name="newsletter" value="Weekly"> Weekly</label>
    <label><input type="checkbox" name="newsletter" value="Monthly" checked> Monthly</label>
    <label><input type="checkbox" name="newsletter" value="Yearly"> Yearly</label>
  </form>
  <div id="count"></div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    var countChecked = function() {
      var n = $("input:checked").length;
      $("#count").text(n + (n === 1 ? " is" : " are") + " checked!");
    };
    countChecked();
    $("input[type=checkbox]").on("click", countChecked);
  </script>
</body>
</html>

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jQuery countChecked — official demo (Try It)