<!Doctype html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
</head>
<body>
<label>Number of Shares:</label><input name="shares" id="shares" type="text" />
<br /> Total Value: € <span id="result"></span>
<script>
$(document).ready(function() {
$('#shares').keyup(function() {
$('#result').text($('#shares').val() * 1.5);
});
});
</script>
</body>
</html>