diff --git a/osc_placement/resources/inventory.py b/osc_placement/resources/inventory.py
index ddb41d2..745acfb 100644
--- a/osc_placement/resources/inventory.py
+++ b/osc_placement/resources/inventory.py
@@ -26,6 +26,7 @@ from osc_placement import version
 BASE_URL = '/resource_providers/{uuid}/inventories'
 PER_CLASS_URL = BASE_URL + '/{resource_class}'
 RP_BASE_URL = '/resource_providers'
+USAGES_BASE_URL = '/resource_providers/{uuid}/usages'
 INVENTORY_FIELDS = {
     'allocation_ratio': {
         'type': float,
@@ -372,7 +373,18 @@ class ShowInventory(command.ShowOne):
         url = PER_CLASS_URL.format(uuid=parsed_args.uuid,
                                    resource_class=parsed_args.resource_class)
         resource = http.request('GET', url).json()
-        return FIELDS, utils.get_dict_properties(resource, FIELDS)
+
+        # TODO(stephenfin): We should just include this information in the
+        # above API. Alternatively, we should add an API to retrieve usage for
+        # a single resource class
+        url = USAGES_BASE_URL.format(uuid=parsed_args.uuid)
+        resources = http.request('GET', url).json()['usages']
+
+        resource['used'] = resources[parsed_args.resource_class]
+
+        fields = FIELDS + ('used', )
+
+        return fields, utils.get_dict_properties(resource, fields)
 
 
 class ListInventory(command.Lister):
@@ -401,6 +413,14 @@ class ListInventory(command.Lister):
             for k, v in resources['inventories'].items()
         ]
 
-        fields = ('resource_class', ) + FIELDS
+        # TODO(stephenfin): We should just include this information in the
+        # above API
+        url = USAGES_BASE_URL.format(uuid=parsed_args.uuid)
+        resources = http.request('GET', url).json()['usages']
+
+        for inventory in inventories:
+            inventory['used'] = resources[inventory['resource_class']]
+
+        fields = ('resource_class', ) + FIELDS + ('used', )
         rows = (utils.get_dict_properties(i, fields) for i in inventories)
         return fields, rows
diff --git a/osc_placement/tests/functional/base.py b/osc_placement/tests/functional/base.py
index 13f6f2a..b69d860 100644
--- a/osc_placement/tests/functional/base.py
+++ b/osc_placement/tests/functional/base.py
@@ -290,15 +290,28 @@ class BaseTestCase(base.BaseTestCase):
         cmd = 'resource provider allocation delete ' + consumer_uuid
         return self.openstack(cmd)
 
-    def resource_inventory_show(self, uuid, resource_class):
-        cmd = 'resource provider inventory show {uuid} {rc}'.format(
-            uuid=uuid, rc=resource_class
+    def resource_inventory_show(
+        self, uuid, resource_class, *, include_used=False,
+    ):
+        resource = self.openstack(
+            f'resource provider inventory show {uuid} {resource_class}',
+            use_json=True,
         )
-        return self.openstack(cmd, use_json=True)
+        if not include_used:
+            del resource['used']
 
-    def resource_inventory_list(self, uuid):
-        return self.openstack('resource provider inventory list ' + uuid,
-                              use_json=True)
+        return resource
+
+    def resource_inventory_list(self, uuid, *, include_used=False):
+        resources = self.openstack(
+            f'resource provider inventory list {uuid}',
+            use_json=True,
+        )
+        if not include_used:
+            for resource in resources:
+                del resource['used']
+
+        return resources
 
     def resource_inventory_delete(self, uuid, resource_class=None):
         cmd = 'resource provider inventory delete {uuid}'.format(uuid=uuid)
diff --git a/osc_placement/tests/functional/test_inventory.py b/osc_placement/tests/functional/test_inventory.py
index 9693113..1f372de 100644
--- a/osc_placement/tests/functional/test_inventory.py
+++ b/osc_placement/tests/functional/test_inventory.py
@@ -27,17 +27,24 @@ class TestInventory(base.BaseTestCase):
 
     def test_inventory_show(self):
         rp_uuid = self.rp['uuid']
-        expected = {'min_unit': 1,
-                    'max_unit': 12,
-                    'reserved': 0,
-                    'step_size': 1,
-                    'total': 12,
-                    'allocation_ratio': 16.0}
+        updates = {
+            'min_unit': 1,
+            'max_unit': 12,
+            'reserved': 0,
+            'step_size': 1,
+            'total': 12,
+            'allocation_ratio': 16.0,
+        }
+        expected = updates.copy()
+        expected['used'] = 0
+        args = ['VCPU:%s=%s' % (k, v) for k, v in updates.items()]
 
-        args = ['VCPU:%s=%s' % (k, v) for k, v in expected.items()]
         self.resource_inventory_set(rp_uuid, *args)
-        self.assertEqual(expected,
-                         self.resource_inventory_show(rp_uuid, 'VCPU'))
+
+        self.assertEqual(
+            expected,
+            self.resource_inventory_show(rp_uuid, 'VCPU', include_used=True),
+        )
 
     def test_inventory_show_not_found(self):
         rp_uuid = self.rp['uuid']
@@ -48,6 +55,27 @@ class TestInventory(base.BaseTestCase):
         self.assertIn('No inventory of class VCPU for {}'.format(rp_uuid),
                       six.text_type(exc))
 
+    def test_inventory_list(self):
+        rp_uuid = self.rp['uuid']
+        updates = {
+            'min_unit': 1,
+            'max_unit': 12,
+            'reserved': 0,
+            'step_size': 1,
+            'total': 12,
+            'allocation_ratio': 16.0,
+        }
+        expected = [updates.copy()]
+        expected[0]['resource_class'] = 'VCPU'
+        expected[0]['used'] = 0
+        args = ['VCPU:%s=%s' % (k, v) for k, v in updates.items()]
+
+        self.resource_inventory_set(rp_uuid, *args)
+
+        self.assertEqual(
+            expected, self.resource_inventory_list(rp_uuid, include_used=True),
+        )
+
     def test_inventory_delete(self):
         rp_uuid = self.rp['uuid']
 
diff --git a/releasenotes/notes/show-usage-in-inventory-31eb87a6d243fc5a.yaml b/releasenotes/notes/show-usage-in-inventory-31eb87a6d243fc5a.yaml
new file mode 100644
index 0000000..27d4b16
--- /dev/null
+++ b/releasenotes/notes/show-usage-in-inventory-31eb87a6d243fc5a.yaml
@@ -0,0 +1,6 @@
+---
+features:
+  - |
+    The ``openstack resource provider inventory list`` and ``openstack resource
+    provider inventory show`` commands now include a ``used`` column providing
+    summary usage information for the specified resource(s).