diff --git a/docs/examples.rst b/docs/examples.rst
index f526ca5..7d807d4 100644
--- a/docs/examples.rst
+++ b/docs/examples.rst
@@ -38,6 +38,16 @@ Default sizes are ``tiny`` (420x315), ``small`` (480x360), ``medium`` (640x480),
 .. versionadded:: 0.7
     This usage has been added in version 0.7.
 
+.. versionadded:: 0.9
+
+  And use relative percentual size:
+
+  ::
+
+      {% video my_video '100% x 50%' %}
+
+
+
 .. tip::
 
   We recommend to use `sorl-thumbnail
diff --git a/embed_video/templatetags/embed_video_tags.py b/embed_video/templatetags/embed_video_tags.py
index 4ea32ef..5e4e86b 100644
--- a/embed_video/templatetags/embed_video_tags.py
+++ b/embed_video/templatetags/embed_video_tags.py
@@ -37,6 +37,7 @@ class VideoNode(Node):
 
         {% video item.video "large" %}
         {% video item.video "340x200" %}
+        {% video item.video "100% x 300" %}
 
         {% video item.video as my_video %}
             URL: {{ my_video.url }}
@@ -48,7 +49,7 @@ class VideoNode(Node):
     error_msg = 'Syntax error. Expected: ``{% video URL ... %}``'
     default_size = 'small'
 
-    re_size = re.compile('(?P<width>\d+)x(?P<height>\d+)')
+    re_size = re.compile('(?P<width>\d+%?) *x *(?P<height>\d+%?)')
 
     def __init__(self, parser, token):
         self.size = None
@@ -150,7 +151,7 @@ class VideoNode(Node):
 
         try:
             size = VideoNode.re_size.match(value)
-            return [int(size.group('width')), int(size.group('height'))]
+            return [size.group('width'), size.group('height')]
         except AttributeError:
             raise TemplateSyntaxError(
                 'Incorrect size.\nPossible format is WIDTHxHEIGHT or using '
diff --git a/embed_video/tests/tests_tags.py b/embed_video/tests/tests_tags.py
index 7417c56..e984bf1 100644
--- a/embed_video/tests/tests_tags.py
+++ b/embed_video/tests/tests_tags.py
@@ -187,3 +187,19 @@ class EmbedVideoNodeTestCase(TestCase):
             log = logs.records[-1]
             self.assertEqual(log.name, 'embed_video.templatetags.embed_video_tags')
             self.assertEqual(log.msg, 'Timeout reached during rendering embed video (`http://vimeo.com/72304002`)')
+
+    def test_relative_size(self):
+        template = Template("""
+            {% load embed_video_tags %}
+            {% video "http://vimeo.com/72304002" "80%x30%" %}
+        """)
+        rendered = '<iframe width="80%" height="30%" src="http://player.vimeo.com/video/72304002" frameborder="0" allowfullscreen></iframe>'
+        self.assertEqual(template.render(self._grc()).strip(), rendered)
+
+    def test_allow_spaces_in_size(self):
+        template = Template("""
+            {% load embed_video_tags %}
+            {% video "http://vimeo.com/72304002" "80% x 300" %}
+        """)
+        rendered = '<iframe width="80%" height="300" src="http://player.vimeo.com/video/72304002" frameborder="0" allowfullscreen></iframe>'
+        self.assertEqual(template.render(self._grc()).strip(), rendered)