I just put those there for reference to the way the cal works.

create calc.php
create a form inside
have it submit to itself
if $_POST data exists, run the calc using $_POST data.

PHP Code
<form method="POST">
<label>Number of Injectors</label> 
<input type="text" name="NOI" value="4">
<br><input type="submit" value="Submit Form">
</form>
<br/><br/>

<?php
if(count($_POST) > 0){
   print'<pre>'.print_r($_POST).'</pre>';
   echo 'You entered '.$_POST['NOI'].' number of injectors';
   //...
}
?>


That should get you going smile

Last edited by Charles Lavoie; May 17, 2016 02:33 pm UTC.
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