diff --git a/controller/Users.py b/controller/Users.py
index 1d6ecf2..ee71c06 100644
--- a/controller/Users.py
+++ b/controller/Users.py
@@ -548,6 +548,17 @@ class Users( object ):
     """
     return sum( self.__database.select_one( tuple, user.sql_calculate_storage() ), 0 )
 
+  def calculate_group_storage( self, user ):
+    """
+    Calculate total storage utilization for all groups that the given user is a member of.
+
+    @type user: User
+    @param user: user for which to calculate storage utilization
+    @rtype: int
+    @return: total bytes used for group storage
+    """
+    return self.__database.select_one( int, user.sql_calculate_group_storage() )
+
   def update_storage( self, user_id, commit = True ):
     """
     Calculate and record total storage utilization for the given user.
@@ -564,6 +575,7 @@ class Users( object ):
     if user:
       user.storage_bytes = self.calculate_storage( user )
       self.__database.save( user, commit )
+      user.group_storage_bytes = self.calculate_group_storage( user )
 
     return user
 
diff --git a/controller/test/Test_controller.py b/controller/test/Test_controller.py
index 013a0ac..ea8507b 100644
--- a/controller/test/Test_controller.py
+++ b/controller/test/Test_controller.py
@@ -119,6 +119,12 @@ class Test_controller( object ):
     User.sql_calculate_storage = lambda self: \
       lambda database: sql_calculate_storage( self, database )
 
+    def sql_calculate_group_storage( self, database ):
+      return 0
+
+    User.sql_calculate_group_storage = lambda self: \
+      lambda database: sql_calculate_group_storage( self, database )
+
     def sql_has_access( self, notebook_id, read_write, owner, database ):
       for ( user_id, notebook_infos ) in database.user_notebook.items():
         for notebook_info in notebook_infos:
diff --git a/controller/test/Test_users.py b/controller/test/Test_users.py
index fa0b9eb..529b37c 100644
--- a/controller/test/Test_users.py
+++ b/controller/test/Test_users.py
@@ -679,6 +679,7 @@ class Test_users( Test_controller ):
 
     user = self.database.load( User, self.user.object_id )
     assert user.storage_bytes == expected_size
+    assert user.group_storage_bytes == 0
     assert user.revision > previous_revision
 
   def test_update_storage_with_unknown_user_id( self ):
@@ -690,6 +691,7 @@ class Test_users( Test_controller ):
 
     user = self.database.load( User, self.user.object_id )
     assert self.user.storage_bytes == 0
+    assert self.user.group_storage_bytes == 0
     assert self.user.revision == original_revision
 
   def test_check_access( self ):