diff --git a/rq/registry.py b/rq/registry.py
index afa7b5b..2e5fd22 100644
--- a/rq/registry.py
+++ b/rq/registry.py
@@ -21,6 +21,15 @@ class StartedJobRegistry:
         self.key = 'rq:wip:%s' % name
         self.connection = resolve_connection(connection)
 
+    def __len__(self):
+        """Returns the number of jobs in this registry"""
+        return self.get_job_count()
+
+    def get_job_count(self):
+        """Returns the number of jobs in this registry"""
+        self.move_expired_jobs_to_failed_queue()
+        return self.connection.zcard(self.key)
+
     def add(self, job, timeout, pipeline=None):
         """Adds a job to StartedJobRegistry with expiry time of now + timeout."""
         score = current_timestamp() + timeout
diff --git a/tests/test_job_started_registry.py b/tests/test_job_started_registry.py
index addb1db..312f762 100644
--- a/tests/test_job_started_registry.py
+++ b/tests/test_job_started_registry.py
@@ -76,3 +76,10 @@ class TestQueue(RQTestCase):
 
         worker.perform_job(job)
         self.assertNotIn(job.id, registry.get_job_ids())
+
+    def test_get_job_count(self):
+        """StartedJobRegistry returns the right number of job count."""
+        self.testconn.zadd(self.registry.key, 1, 'foo')
+        self.testconn.zadd(self.registry.key, 10, 'bar')
+        self.assertEqual(self.registry.get_job_count(), 2)
+        self.assertEqual(len(self.registry), 2)