diff --git a/kivy_garden/graph/__init__.py b/kivy_garden/graph/__init__.py
index 50a02cb..0e0c4a3 100644
--- a/kivy_garden/graph/__init__.py
+++ b/kivy_garden/graph/__init__.py
@@ -1417,7 +1417,7 @@ def update_bar_width(self, *ar):
 
         point_width = (
             len(self.points) *
-            float(abs(self.graph.xmax) + abs(self.graph.xmin)) /
+            float(self.graph.xmax - self.graph.xmin) /
             float(abs(max(self.points)[0]) + abs(min(self.points)[0])))
 
         if not self.points: