--- a/www/js/mon_ispindel.js	Fri Apr 17 11:29:37 2020 +0200
+++ b/www/js/mon_ispindel.js	Sat Apr 18 11:12:28 2020 +0200
@@ -147,7 +147,7 @@
 
    if (record.og_gravity) {
     var og = plato_to_sg(record.og_gravity);
-    var svg = 100 * (og - sg) / (og - 1);
+    var svg = calc_svg(og, sg);
 
     $('#vg_og1').html(og.toFixed(4));
     $('#vg_og2').html(record.og_gravity.toFixed(1) + '&deg;P');