diff -r 08c92cb740b9 -r 5b6bb99bc52a www/includes/formulas.php
--- a/www/includes/formulas.php	Sat Nov 17 19:44:39 2018 +0100
+++ b/www/includes/formulas.php	Sat Nov 17 20:40:23 2018 +0100
@@ -197,23 +197,28 @@
 
 
 
-function calc_IBU($useat, $form, $sg, $volume, $mass, $boiltime, $alpha, $method) {
+function calc_IBU($useat, $form, $sg, $volume, $mass, $boiltime, $alpha, $method)
+{
+	global $my_factor_mashhop;
+	global $my_factor_fwh;
+	global $my_factor_pellet;
+	global $my_factor_plug;
 
 	$fmoment  = 1.0;
 	if (($useat == "Dry Hop") || ($useat == "Dry hop") || ($useat == "Whirlpool") || ($useat == "Aroma")) {
 		$fmoment = 0.0;
 	} else if ($useat == "Mash") {
-		$fmoment += /* Settings.MashHopFactor.Value = -30% */ -30 / 100;         // Brouwhulp
+		$fmoment += $my_factor_mashhop / 100;         // Brouwhulp
 	} else if (($useat == "First Wort") || ($useat == "First wort")) {
-		$fmoment += /* Settings.FWHFactor.Value = 10% */ 10 / 100;         // Brouwhulp, Louis, Ozzie
+		$fmoment += $my_factor_fwh / 100;         // Brouwhulp, Louis, Ozzie
 	}
 
 	$pfactor  = 1.0;
 	if ($form == "Pellet") {
-		$pfactor += /* Settings.PelletFactor.Value = 10% */ 10 / 100;
+		$pfactor += $my_factor_pellet / 100;
 	}
 	if ($form == "Plug") {
-		$pfactor += /* Settings.PlugFactor.Value = 2% */ 2 / 100;
+		$pfactor += $my_factor_plug / 100;
 	}
 
 	$ibu = 0;