diff --git a/combo/apps/dataviz/models.py b/combo/apps/dataviz/models.py
index c900f29a..2ceb7fc9 100644
--- a/combo/apps/dataviz/models.py
+++ b/combo/apps/dataviz/models.py
@@ -554,8 +554,12 @@ class ChartNgCell(CellBase):
                     chart.x_labels = [pygal.util.truncate(x, 15) for x in chart.x_labels]
         else:
             chart.show_legend = True
-            if width and width < 500:
-                chart.truncate_legend = 15
+            if width and height:
+                # pies are as tall as wide, reserve the appropriate space and distribute
+                # the rest for the legend.
+                chart.truncate_legend = (width - height) // 10
+            elif width:
+                chart.truncate_legend = width // 20
 
     def process_one_dimensional_data(self, chart, data):
         if self.hide_null_values: