diff --git a/taskflow/patterns/graph_flow.py b/taskflow/patterns/graph_flow.py
index 46c7394a..7e051db0 100644
--- a/taskflow/patterns/graph_flow.py
+++ b/taskflow/patterns/graph_flow.py
@@ -61,6 +61,9 @@ class Flow(linear_flow.Flow):
                 break
         return runner
 
+    def __len__(self):
+        return len(self._graph)
+
     @decorators.locked
     def add_dependency(self, provider_uuid, requirer_uuid):
         """Connects provider to requirer where provider will now be required
diff --git a/taskflow/patterns/linear_flow.py b/taskflow/patterns/linear_flow.py
index c64635d8..96ef74e9 100644
--- a/taskflow/patterns/linear_flow.py
+++ b/taskflow/patterns/linear_flow.py
@@ -120,6 +120,9 @@ class Flow(base.Flow):
                 except (IndexError, ValueError):
                     pass
 
+    def __len__(self):
+        return len(self._runners)
+
     def _connect(self):
         if self._connected:
             return self._runners