mltgroup

If you're looking to have it automatically add up without a page refresh or submit button clicked you'd need to use Javascript & AJAX. Otherwise your form could look like this: <form method="post" action="index.php"> <input type="text" name="field_1" /> First Number<br /> <input type="text" name="field_2" /> Second Number<br /> <input type="submit" /> </form> on the index.php file in the header you would do this: <?php $val = $_POST['field_1'] + $_POST['field_2']; echo $val; ?>