diff --git a/mongokat/collection.py b/mongokat/collection.py
index 7133d45..a4fc45a 100644
--- a/mongokat/collection.py
+++ b/mongokat/collection.py
@@ -133,6 +133,12 @@ def exists(self, query, **args):
     def count(self, *args, **kwargs):
         return self._collection_with_options(kwargs).count(*args, **kwargs)
 
+    def count_documents(self, *args, **kwargs):
+        return self._collection_with_options(kwargs).count_documents(*args, **kwargs)
+
+    def estimated_document_count(self, **kwargs):
+        return self._collection_with_options(kwargs).estimated_document_count(**kwargs)
+
     def distinct(self, *args, **kwargs):
         return self._collection_with_options(kwargs).distinct(*args, **kwargs)
 
diff --git a/tests/test_api.py b/tests/test_api.py
index 5701ba9..e2aa8aa 100644
--- a/tests/test_api.py
+++ b/tests/test_api.py
@@ -89,12 +89,16 @@ def test_document_common_methods(Sample):
   import collections
 
   assert Sample.collection.find().count() == 0
+  assert Sample.collection.find().count_documents({}) == 0
+  assert Sample.collection.find().estimated_document_count() == 0
 
   # Instanciate
   new_object = Sample({"name": "XXX", "url": "http://example.com"})
 
   # Should not save to DB yet.
   assert Sample.collection.find().count() == 0
+  assert Sample.collection.find().count_documents({}) == 0
+  assert Sample.collection.find().estimated_document_count() == 0
 
   # Now save()
   new_object.save()
@@ -106,6 +110,8 @@ def test_document_common_methods(Sample):
   assert type(new_object["_id"]) == ObjectId
 
   assert Sample.collection.find().count() == 1
+  assert Sample.collection.find().count_documents({}) == 1
+  assert Sample.collection.find().estimated_document_count() == 1
   db_object = Sample.collection.find_one()
   assert type(db_object) == dict
   assert db_object["name"] == "XXX"
@@ -115,6 +121,8 @@ def test_document_common_methods(Sample):
   assert type(inserted_object) == ObjectId
 
   assert Sample.collection.find().count() == 2
+  assert Sample.collection.find().count_documents({}) == 2
+  assert Sample.collection.find().estimated_document_count() == 2
 
   # Find back with different methods
   orm_object = Sample.find_by_id(db_object["_id"])
@@ -168,11 +176,15 @@ def test_document_common_methods(Sample):
     orm_object.save()
 
   assert Sample.collection.find().count() == 2
+  assert Sample.collection.find().count_documents({}) == 2
+  assert Sample.collection.find().estimated_document_count() == 2
 
   # FIXME not anymore as we are requesting _id for each query
   # orm_object.save(force=True)
 
   # assert Sample.collection.find().count() == 3
+  # assert Sample.collection.find().count_documents({}) == 3
+  # assert Sample.collection.find().estimated_document_count() == 3
 
   orm_object = Sample.find_by_id(db_object["_id"], fields=["url", "_id"])
   assert dict(orm_object) == {"url": "http://example.com", "_id": db_object["_id"]}
@@ -186,6 +198,9 @@ def test_document_common_methods(Sample):
     orm_object.save()
 
   assert Sample.collection.find().count() == 2
+  assert Sample.collection.find().count_documents({}) == 2
+  assert Sample.collection.find().estimated_document_count() == 2
+
   db_object = Sample.collection.find_one({"_id": db_object["_id"]})
   assert "name" in db_object
 
@@ -193,6 +208,8 @@ def test_document_common_methods(Sample):
 
   # Should not add anything new
   assert Sample.collection.find().count() == 2
+  assert Sample.collection.find().count_documents({}) == 2
+  assert Sample.collection.find().estimated_document_count() == 2
 
   db_object = Sample.collection.find_one({"_id": db_object["_id"]})
   assert "name" not in db_object