diff --git a/cinder/api/openstack/api_version_request.py b/cinder/api/openstack/api_version_request.py
index 055d5b5d03c..e56994752c8 100644
--- a/cinder/api/openstack/api_version_request.py
+++ b/cinder/api/openstack/api_version_request.py
@@ -59,6 +59,7 @@ REST_API_VERSION_HISTORY = """
     * 3.9 - Add backup update interface.
     * 3.10 - Add group_id filter to list/detail volumes in _get_volumes.
     * 3.11 - Add group types and group specs API.
+    * 3.12 - Add volumes summary API.
 
 """
 
@@ -67,7 +68,7 @@ REST_API_VERSION_HISTORY = """
 # minimum version of the API supported.
 # Explicitly using /v1 or /v2 enpoints will still work
 _MIN_API_VERSION = "3.0"
-_MAX_API_VERSION = "3.11"
+_MAX_API_VERSION = "3.12"
 _LEGACY_API_VERSION1 = "1.0"
 _LEGACY_API_VERSION2 = "2.0"
 
diff --git a/cinder/api/openstack/rest_api_version_history.rst b/cinder/api/openstack/rest_api_version_history.rst
index 0314b89f5aa..0068e36ac43 100644
--- a/cinder/api/openstack/rest_api_version_history.rst
+++ b/cinder/api/openstack/rest_api_version_history.rst
@@ -174,3 +174,7 @@ user documentation.
 3.11
 ----
   Added group types and group specs API.
+
+3.12
+----
+  Added volumes/summary API.
diff --git a/cinder/api/v3/router.py b/cinder/api/v3/router.py
index 72a4cbc8662..9bacc44b9cc 100644
--- a/cinder/api/v3/router.py
+++ b/cinder/api/v3/router.py
@@ -53,7 +53,7 @@ class APIRouter(cinder.api.openstack.APIRouter):
         self.resources['volumes'] = volumes.create_resource(ext_mgr)
         mapper.resource("volume", "volumes",
                         controller=self.resources['volumes'],
-                        collection={'detail': 'GET'},
+                        collection={'detail': 'GET', 'summary': 'GET'},
                         member={'action': 'POST'})
 
         self.resources['messages'] = messages.create_resource(ext_mgr)
diff --git a/cinder/api/v3/views/volumes.py b/cinder/api/v3/views/volumes.py
new file mode 100644
index 00000000000..ecfcf410791
--- /dev/null
+++ b/cinder/api/v3/views/volumes.py
@@ -0,0 +1,24 @@
+#    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.
+
+
+class ViewBuilder(object):
+    """Model a server API response as a python dictionary."""
+
+    def quick_summary(self, volume_count, volume_size):
+        """Number of volumes and size of volumes."""
+        return {
+            'volume-summary': {
+                'total_count': volume_count,
+                'total_size': volume_size
+            },
+        }
diff --git a/cinder/api/v3/volumes.py b/cinder/api/v3/volumes.py
index f8ef58c7d1e..2d3df74dc09 100644
--- a/cinder/api/v3/volumes.py
+++ b/cinder/api/v3/volumes.py
@@ -16,8 +16,11 @@
 from cinder.api import common
 from cinder.api.openstack import wsgi
 from cinder.api.v2 import volumes as volumes_v2
+from cinder.api.v3.views import volumes as volume_views_v3
 from cinder import utils
 
+SUMMARY_BASE_MICRO_VERSION = '3.12'
+
 
 class VolumeController(volumes_v2.VolumeController):
     """The Volumes API controller for the OpenStack API V3."""
@@ -72,6 +75,19 @@ class VolumeController(volumes_v2.VolumeController):
             volumes = self._view_builder.summary_list(req, volumes)
         return volumes
 
+    @wsgi.Controller.api_version(SUMMARY_BASE_MICRO_VERSION)
+    def summary(self, req):
+        """Return summary of volumes."""
+        view_builder_v3 = volume_views_v3.ViewBuilder()
+        context = req.environ['cinder.context']
+        filters = req.params.copy()
+
+        utils.remove_invalid_filter_options(context, filters,
+                                            self._get_volume_filter_options())
+
+        volumes = self.volume_api.get_volume_summary(context, filters=filters)
+        return view_builder_v3.quick_summary(volumes[0], int(volumes[1]))
+
 
 def create_resource(ext_mgr):
     return wsgi.Resource(VolumeController(ext_mgr))
diff --git a/cinder/db/api.py b/cinder/db/api.py
index 712717ee162..187352a0515 100644
--- a/cinder/db/api.py
+++ b/cinder/db/api.py
@@ -280,6 +280,16 @@ def volume_get_all_by_project(context, project_id, marker, limit,
                                           offset=offset)
 
 
+def get_volume_summary_all(context):
+    """Get all volume summary."""
+    return IMPL.get_volume_summary_all(context)
+
+
+def get_volume_summary_by_project(context, project_id):
+    """Get all volume summary belonging to a project."""
+    return IMPL.get_volume_summary_by_project(context, project_id)
+
+
 def volume_update(context, volume_id, values):
     """Set the given properties on a volume and update it.
 
diff --git a/cinder/db/sqlalchemy/api.py b/cinder/db/sqlalchemy/api.py
index 5a5af77882a..a3d821c6cf5 100644
--- a/cinder/db/sqlalchemy/api.py
+++ b/cinder/db/sqlalchemy/api.py
@@ -1775,6 +1775,23 @@ def volume_get_all(context, marker, limit, sort_keys=None, sort_dirs=None,
         return query.all()
 
 
+@require_admin_context
+def get_volume_summary_all(context):
+    """Retrieves all volumes summary.
+
+    :param context: context to query under
+    :returns: volume summary of all projects
+    """
+    query = model_query(context, func.count(models.Volume.id),
+                        func.sum(models.Volume.size), read_deleted="no")
+
+    if query is None:
+        return []
+
+    result = query.first()
+    return (result[0] or 0, result[1] or 0)
+
+
 @require_admin_context
 def volume_get_all_by_host(context, host, filters=None):
     """Retrieves all volumes hosted on a host.
@@ -2077,6 +2094,25 @@ def process_sort_params(sort_keys, sort_dirs, default_keys=None,
     return result_keys, result_dirs
 
 
+@require_context
+def get_volume_summary_by_project(context, project_id):
+    """Retrieves all volumes summary in a project.
+
+    :param context: context to query under
+    :param project_id: project for all volumes being retrieved
+    :returns: volume summary of a project
+    """
+    query = model_query(context, func.count(models.Volume.id),
+                        func.sum(models.Volume.size), read_deleted="no").\
+        filter_by(project_id=project_id)
+
+    if query is None:
+        return []
+
+    result = query.first()
+    return (result[0] or 0, result[1] or 0)
+
+
 @handle_db_data_error
 @require_context
 def volume_update(context, volume_id, values):
diff --git a/cinder/objects/volume.py b/cinder/objects/volume.py
index 6b3f54fffcd..16f02de3763 100644
--- a/cinder/objects/volume.py
+++ b/cinder/objects/volume.py
@@ -538,3 +538,13 @@ class VolumeList(base.ObjectListBase, base.CinderObject):
         expected_attrs = cls._get_expected_attrs(context)
         return base.obj_make_list(context, cls(context), objects.Volume,
                                   volumes, expected_attrs=expected_attrs)
+
+    @classmethod
+    def get_volume_summary_all(cls, context):
+        volumes = db.get_volume_summary_all(context)
+        return volumes
+
+    @classmethod
+    def get_volume_summary_by_project(cls, context, project_id):
+        volumes = db.get_volume_summary_by_project(context, project_id)
+        return volumes
diff --git a/cinder/tests/unit/api/v2/test_volumes.py b/cinder/tests/unit/api/v2/test_volumes.py
index 50edc4cc231..e33de4f6cdb 100644
--- a/cinder/tests/unit/api/v2/test_volumes.py
+++ b/cinder/tests/unit/api/v2/test_volumes.py
@@ -128,7 +128,8 @@ class VolumeApiTest(test.TestCase):
         res_dict = self.controller.detail(req)
         self.assertTrue(mock_validate.called)
 
-    def _vol_in_request_body(self,
+    @classmethod
+    def _vol_in_request_body(cls,
                              size=stubs.DEFAULT_VOL_SIZE,
                              name=stubs.DEFAULT_VOL_NAME,
                              description=stubs.DEFAULT_VOL_DESCRIPTION,
diff --git a/cinder/tests/unit/api/v3/test_volumes.py b/cinder/tests/unit/api/v3/test_volumes.py
index 80d81d1e2a9..2682b22eb7c 100644
--- a/cinder/tests/unit/api/v3/test_volumes.py
+++ b/cinder/tests/unit/api/v3/test_volumes.py
@@ -20,8 +20,10 @@ from cinder.api.openstack import api_version_request as api_version
 from cinder.api.v3 import volumes
 from cinder import context
 from cinder import db
+from cinder import exception
 from cinder import test
 from cinder.tests.unit.api import fakes
+from cinder.tests.unit.api.v2 import test_volumes as v2_test_volumes
 from cinder.tests.unit import fake_constants as fake
 from cinder.volume.api import API as vol_get
 
@@ -145,3 +147,33 @@ class VolumeApiTest(test.TestCase):
         res_dict = self.controller.index(req)
         volumes = res_dict['volumes']
         self.assertEqual(2, len(volumes))
+
+    def _fake_volumes_summary_request(self, version='3.12'):
+        req = fakes.HTTPRequest.blank('/v3/volumes/summary')
+        req.headers = {'OpenStack-API-Version': 'volume ' + version}
+        req.api_version_request = api_version.APIVersionRequest(version)
+        return req
+
+    def test_volumes_summary_in_unsupport_version(self):
+        """Function call to test summary volumes API in unsupported version"""
+        req = self._fake_volumes_summary_request(version='3.7')
+        self.assertRaises(exception.VersionNotFoundForAPIMethod,
+                          self.controller.summary, req)
+
+    def test_volumes_summary_in_supported_version(self):
+        """Function call to test the summary volumes API for version v3."""
+        req = self._fake_volumes_summary_request()
+        res_dict = self.controller.summary(req)
+        expected = {'volume-summary': {'total_size': 0.0, 'total_count': 0}}
+        self.assertEqual(expected, res_dict)
+
+        vol = v2_test_volumes.VolumeApiTest._vol_in_request_body(
+            availability_zone="nova")
+        body = {"volume": vol}
+        req = fakes.HTTPRequest.blank('/v3/volumes')
+        res_dict = self.controller.create(req, body)
+
+        req = self._fake_volumes_summary_request()
+        res_dict = self.controller.summary(req)
+        expected = {'volume-summary': {'total_size': 1.0, 'total_count': 1}}
+        self.assertEqual(expected, res_dict)
diff --git a/cinder/volume/api.py b/cinder/volume/api.py
index 4209bf194f8..0a6cb41bad7 100644
--- a/cinder/volume/api.py
+++ b/cinder/volume/api.py
@@ -523,6 +523,24 @@ class API(base.Base):
         LOG.info(_LI("Get all volumes completed successfully."))
         return volumes
 
+    def get_volume_summary(self, context, filters=None):
+        check_policy(context, 'get_all')
+
+        if filters is None:
+            filters = {}
+
+        allTenants = utils.get_bool_param('all_tenants', filters)
+
+        if context.is_admin and allTenants:
+            del filters['all_tenants']
+            volumes = objects.VolumeList.get_volume_summary_all(context)
+        else:
+            volumes = objects.VolumeList.get_volume_summary_by_project(
+                context, context.project_id)
+
+        LOG.info(_LI("Get summary completed successfully."))
+        return volumes
+
     def get_snapshot(self, context, snapshot_id):
         check_policy(context, 'get_snapshot')
         snapshot = objects.Snapshot.get_by_id(context, snapshot_id)
diff --git a/releasenotes/notes/volumes-summary-6b2485f339c88a91.yaml b/releasenotes/notes/volumes-summary-6b2485f339c88a91.yaml
new file mode 100644
index 00000000000..d09afc6503b
--- /dev/null
+++ b/releasenotes/notes/volumes-summary-6b2485f339c88a91.yaml
@@ -0,0 +1,4 @@
+---
+features:
+  - A new API to display the volumes summary. This summary API displays the
+    total number of volumes and total volume's size in GB.