diff --git a/src/calibre/customize/profiles.py b/src/calibre/customize/profiles.py
index 2ca3bb0c54..0a3945304a 100644
--- a/src/calibre/customize/profiles.py
+++ b/src/calibre/customize/profiles.py
@@ -37,6 +37,8 @@ class Plugin(_Plugin):
             self.fsizes.append((name, num, float(size)))
         self.fnames = dict((name, sz) for name, _, sz in self.fsizes if name)
         self.fnums = dict((num, sz) for _, num, sz in self.fsizes if num)
+        self.width_pts = self.width * 72./self.dpi
+        self.height_pts = self.height * 72./self.dpi
 
 # Input profiles {{{
 class InputProfile(Plugin):
diff --git a/src/calibre/ebooks/oeb/stylizer.py b/src/calibre/ebooks/oeb/stylizer.py
index 84bce3864e..6c0c384eb3 100644
--- a/src/calibre/ebooks/oeb/stylizer.py
+++ b/src/calibre/ebooks/oeb/stylizer.py
@@ -575,7 +575,7 @@ class Style(object):
             if parent is not None:
                 base = parent.width
             else:
-                base = self._profile.width
+                base = self._profile.width_pts
             if 'width' in self._element.attrib:
                 width = self._element.attrib['width']
             elif 'width' in self._style:
@@ -605,7 +605,7 @@ class Style(object):
             if parent is not None:
                 base = parent.height
             else:
-                base = self._profile.height
+                base = self._profile.height_pts
             if 'height' in self._element.attrib:
                 height = self._element.attrib['height']
             elif 'height' in self._style: