diff -r c1f2a90c93ca -r fef03c7ae353 www/js/prod_edit.js
--- a/www/js/prod_edit.js	Wed Feb 20 21:57:40 2019 +0100
+++ b/www/js/prod_edit.js	Thu Feb 21 16:36:02 2019 +0100
@@ -2164,6 +2164,10 @@
 			calcIBUs();
 			calcYeast();
 		});
+		$("#primary_end_sg").on('change', function (event) {
+			dataRecord.primary_end_sg = parseFloat(event.args.value);
+			calcFermentation();
+		});
 
 		$("#BLog").jqxButton({ disabled: (dataRecord.log_brew) ? false:true });
 		$("#FLog").jqxButton({ disabled: (dataRecord.log_fermentation) ? false:true });