diff --git a/src/calibre/gui2/tag_browser/model.py b/src/calibre/gui2/tag_browser/model.py
index ace8a6f359..377ace6efa 100644
--- a/src/calibre/gui2/tag_browser/model.py
+++ b/src/calibre/gui2/tag_browser/model.py
@@ -159,9 +159,9 @@ class TagTreeItem(object):  # {{{
         return None
 
     def dump_data(self):
-        fmt = '%s [count=%s]'
+        fmt = '%s [count=%s%s]'
         if self.type == self.CATEGORY:
-            return fmt % (self.py_name, len(self.child_tags()))
+            return fmt % (self.py_name, len(self.child_tags()), '')
         tag = self.tag
         if tag.use_sort_as_name:
             name = tag.sort
@@ -172,7 +172,10 @@ class TagTreeItem(object):  # {{{
                 name = tag.name
         count = len(self.id_set)
         count = count if count > 0 else tag.count
-        return fmt % (name, count,)
+        rating = tag.avg_rating or 0
+        if rating:
+            rating = ',rating=%.1f' % rating
+        return fmt % (name, count, rating or '')
 
     def toggle(self, set_to=None):
         '''
diff --git a/src/calibre/srv/metadata.py b/src/calibre/srv/metadata.py
index 53c8c118cd..c66d503d7a 100644
--- a/src/calibre/srv/metadata.py
+++ b/src/calibre/srv/metadata.py
@@ -408,8 +408,11 @@ def dump_categories_tree(data):
     ans, indent = [], '  '
     def dump_node(node, level=0):
         item = items[node['id']]
+        rating = item.get('avg_rating', None) or 0
+        if rating:
+            rating = ',rating=%.1f' % rating
         try:
-            ans.append(indent*level + item['name'] + ' [count=%s]' % (item['count'],))
+            ans.append(indent*level + item['name'] + ' [count=%s%s]' % (item['count'], rating or ''))
         except KeyError:
             print(item)
             raise