diff --git a/cloudkitty/storage/sqlalchemy/alembic/versions/307430ab38bc_improve_qty_precision.py b/cloudkitty/storage/sqlalchemy/alembic/versions/307430ab38bc_improve_qty_precision.py
new file mode 100644
index 00000000..3feaa87f
--- /dev/null
+++ b/cloudkitty/storage/sqlalchemy/alembic/versions/307430ab38bc_improve_qty_precision.py
@@ -0,0 +1,35 @@
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
+"""improve qty precision
+
+Revision ID: 307430ab38bc
+Revises: 792b438b663
+Create Date: 2016-09-05 18:37:26.714065
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = '307430ab38bc'
+down_revision = '792b438b663'
+
+from alembic import op
+import sqlalchemy as sa
+
+
+def upgrade():
+    with op.batch_alter_table('rated_data_frames') as batch_op:
+        batch_op.alter_column(
+            'qty',
+            type_=sa.Numeric(10, 5),
+            existing_type=sa.Numeric())
diff --git a/cloudkitty/storage/sqlalchemy/models.py b/cloudkitty/storage/sqlalchemy/models.py
index 5be55ad9..e4d092c3 100644
--- a/cloudkitty/storage/sqlalchemy/models.py
+++ b/cloudkitty/storage/sqlalchemy/models.py
@@ -44,7 +44,7 @@ class RatedDataFrame(Base, models.ModelBase):
                             nullable=False)
     unit = sqlalchemy.Column(sqlalchemy.String(255),
                              nullable=False)
-    qty = sqlalchemy.Column(sqlalchemy.Numeric(),
+    qty = sqlalchemy.Column(sqlalchemy.Numeric(10, 5),
                             nullable=False)
     res_type = sqlalchemy.Column(sqlalchemy.String(255),
                                  nullable=False)
diff --git a/cloudkitty/transformer/format.py b/cloudkitty/transformer/format.py
index 44a7fd9b..a124f13a 100644
--- a/cloudkitty/transformer/format.py
+++ b/cloudkitty/transformer/format.py
@@ -19,7 +19,7 @@ from cloudkitty import transformer
 
 
 class CloudKittyFormatTransformer(transformer.BaseTransformer):
-    def format_item(self, desc, unit, qty=1):
+    def format_item(self, desc, unit, qty=1.0):
         data = {}
         data['desc'] = desc
         data['vol'] = {'unit': unit, 'qty': qty}